CN113653531A - Method for draining low-permeability roof water - Google Patents
Method for draining low-permeability roof water Download PDFInfo
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- CN113653531A CN113653531A CN202111017975.1A CN202111017975A CN113653531A CN 113653531 A CN113653531 A CN 113653531A CN 202111017975 A CN202111017975 A CN 202111017975A CN 113653531 A CN113653531 A CN 113653531A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 157
- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000035699 permeability Effects 0.000 claims abstract description 19
- 239000002775 capsule Substances 0.000 claims description 26
- 238000007789 sealing Methods 0.000 claims description 25
- 238000005273 aeration Methods 0.000 claims description 17
- 238000005553 drilling Methods 0.000 claims description 7
- 239000003245 coal Substances 0.000 abstract description 27
- 230000002209 hydrophobic effect Effects 0.000 abstract description 17
- 239000011148 porous material Substances 0.000 abstract description 14
- 238000005065 mining Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 8
- 239000003153 chemical reaction reagent Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
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- 230000036541 health Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000003673 groundwater Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 239000002689 soil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/06—Combinations of two or more pumps
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The embodiment of the application relates to the technical field of coal mining, in particular to a method for draining low-permeability roof water; in the embodiment of the application, by utilizing the good permeability of the aquifer to gas, air is filled into tiny pores of the aquifer through the drill hole of the first lane (such as an upper lane) to replace underground water in the aquifer, and pore water is driven to flow in the direction with low pressure and finally flows out of the hydrophobic hole with the pressure of 0 in the second lane (such as a lower lane), so that the roof water is drained; compared with the traditional hydraulic fracturing method, the cost for draining the low-permeability roof water can be effectively reduced.
Description
Technical Field
The embodiment of the application relates to the technical field of coal mining, in particular to a method for draining low-permeability roof water.
Background
Coal mines are areas where humans mine coal resources in coal-rich mining areas, and are generally divided into underground coal mines and opencast coal mines; when the coal bed is far away from the ground surface, a tunnel is excavated to the underground to mine coal, which is a mineworker coal mine; when the coal bed is very close to the earth surface, the coal is generally excavated by directly stripping the earth surface soil layer, namely an open pit coal mine; the vast majority of coal mines in China belong to underground coal mines; coal mines are reasonable spaces excavated by humans when excavating geological formations rich in coal, and generally include roadways, wells, excavation faces and the like.
In the well building and production processes of a mine, the water damage of the mine is one of very important geological disasters, and the normal construction and production of the whole mine can be interfered to a great extent; on one hand, the water spraying of the working surface influences the body health of related workers, and on the other hand, the further improvement of the labor productivity is hindered; when the water inflow in the whole mine exceeds the drainage capacity of the mine, the whole mine is greatly interfered, so that a local roadway is submerged or stopped production, and the whole mine is submerged.
Taking inner Mongolia and Shaanxi province of China as examples, because the aquifer is thick, the water damage of the roof of the coal seam of the coal mine is very serious, and the huge water drenching of the roof of the working face causes rapid corrosion of large equipment, so that the service life of the large equipment is shortened, the production cost is greatly increased, and the working environment, the occupational health environment and the ground ecological environment are also seriously deteriorated, thereby greatly threatening the physical health of workers.
For a long time, researchers have been studying the drainage technology, trying to drain the aquifer before the stoping, for example, pumping water and other means are adopted, so that the working face is less sprayed with water or even not sprayed with water during the stoping, but the technical means have little effect because the permeability of the aquifer is too poor; during the stoping period of roof water which is difficult to be drained in advance, the permeability coefficient is greatly increased due to mining deformation and damage, so that the roof water on the working face is not stopped as rainstorm; if a hydraulic fracturing method is adopted, although a good effect can be achieved, the cost is too high, and common enterprises cannot bear the method easily; in view of the above, a method for draining low-permeability roof water at low cost is needed.
Disclosure of Invention
The embodiment of the application provides a method for draining low-permeability roof water, and the method is a technology for at least solving the problems of low efficiency of the traditional draining method and high cost of draining the low-permeability roof water by a hydraulic fracturing method.
The method for draining the low-permeability roof water provided by the embodiment of the application comprises the following steps:
drilling and constructing a first roadway roof aquifer on a working face;
drilling construction water holes (also called drainage holes) in the aquifer of the second roadway roof of the working face;
inflating the air inflation holes drilled for construction so that the aquifer water is discharged from the construction water holes of the aquifer of the second port roof;
wherein,
and if the working face is obliquely arranged, the first lane and the second lane are an upper lane and a lower lane respectively.
According to the embodiment of the application, air is filled into tiny pores of the aquifer by utilizing the good permeability of the aquifer to gas so as to replace underground water in the aquifer, pore water is driven to flow in the direction with low pressure, and finally the pore water flows out of a drainage hole with the pressure of 0 in a second lane (lower lane), so that roof water is drained; compared with the traditional draining method, the method can effectively improve the working efficiency, and compared with the hydraulic fracturing method, the method can effectively reduce the cost of draining low-permeability roof water, specifically:
because the permeability of the aquifer is poor, the traditional drainage hole has small water quantity and low drainage efficiency; the traditional hydraulic fracturing method generally pumps the mixed liquid of water, sand and a chemical reagent into rock deep in a stratum under the condition of pressurization, a large amount of water resources, the chemical reagent and the like are consumed, and the air is used for replacing the chemical reagent and the water, so that the cost for draining and draining low-permeability roof water is reduced; in addition, because this application embodiment need not to pass through sand, still saved manpower and material resources cost.
As an alternative embodiment, the hole distance of the inflation holes is determined by analyzing the lithology of the roadway roof aquifer and measuring the water inflow of the roof aquifer in a segmented mode.
The method comprises the steps of measuring the water inflow of a top plate aquifer by analyzing the lithology of the roadway top plate aquifer and segmenting, and taking the measured water inflow as a basis, namely if the particles of the top plate sandstone aquifer are coarse or the water inflow is large, the set distance between the air charging holes is large; otherwise, the water is small, so that the efficiency of subsequently draining low-permeability roof water is improved.
As an alternative embodiment, the pitch of the inflation holes may also be based on the speed of advancement through the work surface to determine the inflation hole pitch.
The embodiment of the application takes the advancing speed of the working face as a basis, namely if the advancing speed of the working face is higher, the distance between the inflation holes is smaller, otherwise, the distance is larger, and therefore the efficiency and the safety of subsequent draining of low-permeability roof water are improved.
As an alternative, the inflation of the inflation port may be at a pressure greater than the aquifer water pressure.
As an alternative embodiment, the inflation holes are inflated with a pressure of air greater than 1.5 times the water pressure of the aquifer.
The principle is described in relation to the inflation of the inflation holes to a pressure greater than the water pressure of the aquifer, and will not be described in any greater detail herein.
As an alternative embodiment, the inflation of the inflation opening is performed by a pressure device.
As an alternative embodiment, the pressure device is connected to the inflation opening via a sealing capsule.
This application embodiment is through setting up the hole sealing capsule to prevent that the body of aerifing from aerifing the hole drill way and letting out, with the guarantee the body of aerifing can all get into the aquifer, flow to the hydrophobic hole of lower lane with the groundwater that the expulsion was deposited in aquifer hole and crack, and then prevent to influence the efficiency of dredging the water because of gas leakage (unloading).
As an alternative embodiment, the pressure device comprises:
the end part of one end of the air inlet pipe is communicated with the hole sealing capsule;
the pressurizing air pump is connected with the end part of the other end of the air inlet pipe;
one end of the water inlet pipe is connected with the hole sealing capsule;
and the booster water pump is connected with the end part of the other end of the water.
In the embodiment of the application, the air inlet pipe and the pressurizing air pump are arranged to pressurize and inflate the inflating hole, so that water passing through the aquifer is discharged (drained) from the drainage hole; through setting up inlet tube and booster water pump to utilize water pressure to make its inflation with the hole sealing capsule, thereby play the effect of sealed inflation hole, and then high-efficient expelling occurrence is in groundwater in aquifer hole and the crack downward lane hydrophobic pore flow, prevents to influence the efficiency of dredging the water because of leaking gas (unloading).
As an optional embodiment, the number of the inflation holes is more than 2, and each inflation hole is arranged at intervals;
more than 2 inflation holes are respectively and correspondingly connected with more than 2 air inlet pipes and one end part of more than 2 water inlet pipes, and the other end parts of more than 2 air inlet pipes and more than 2 water inlet pipes are respectively connected with a booster air pump and a booster water pump through a first multi-way device and a second multi-way device;
the other end tip of intake pipe more than 2 and inlet tube more than 2 links to each other with first multi-ported ware and second multi-ported ware respectively through the valve more than 2 that correspond.
The embodiment of the application improves the efficiency of draining water by arranging more than 2 air charging holes; the range of water drainage is enlarged by arranging the air inflation holes at intervals, so that the water drainage efficiency is improved; the number of the booster air pumps and the number of the booster water pumps are reduced by arranging the first multi-way device and the second multi-way device, so that more than 2 inflation holes can be inflated by 1 booster air pump and 1 booster water pump, and the cost of draining water is saved; in addition, the independent control of the air pressure of the air charging hole is realized by arranging more than 2 valves, so that the adjustment (transfer) of the air pressure is realized by utilizing the valves, namely, the valves are arranged to play a role in manual pressurization or pressure relief.
As an alternative embodiment, the first manifold is a gas distributor.
The embodiment of the application is convenient for people to carry out free and dynamic adjustment on the flow of the multiplexed gas by setting the first multi-channel device as a gas distributor.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram illustrating a method for draining low-permeability roof water according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a pressure device, a first multi-way device, a second multi-way device and a valve in an embodiment of the present application.
Description of reference numerals:
1. a first lane;
2. a second lane;
3. a top plate;
4. an inflation hole;
5. a hydrophobic pore;
6. sealing the pores with capsules;
7. a pressure device; 71. an air inlet pipe; 72. a pressurization air pump; 73. a water inlet pipe; 74. a booster water pump;
8. a first manifold;
9. a second multipass device;
10. a valve;
11. a water barrier layer;
12. an aqueous layer;
13. a coal seam.
Detailed Description
The technical solutions of the embodiments of the present application will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.
In the description of the embodiments of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are only used for convenience in describing the embodiments of the present application and for simplification of description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
As used herein, the terms water fill and air charge pressurization hoses refer to the water inlet and air inlet pipes, respectively.
In the traditional technology, because the thickness of the aquifer is large, the water damage of the roof of the coal bed of the coal mine is very serious, taking Mongolia and Shaanxi provinces in China as examples, the huge water drenching of the roof of the working face causes rapid corrosion of large equipment, so that the service life of the large equipment is shortened, the production cost is greatly increased, and the working environment, the occupational health environment and the ground ecological environment are also seriously deteriorated, thereby greatly threatening the physical health of workers.
For a long time, researchers have been studying the drainage technology, trying to drain the aquifer before the stoping, for example, pumping water and other means are adopted, so that the working face is less sprayed with water or even not sprayed with water during the stoping, but the technical means have little effect because the permeability of the aquifer is too poor; roof water which is difficult to be drained in advance is greatly increased in permeability coefficient due to mining deformation and damage during the stoping period, so that the roof water on the working face is not stopped as rainstorm; if a hydraulic fracturing method is adopted, although a good effect can be achieved, the cost is too high, and common enterprises cannot bear the method easily;
in view of the above, a method for draining low-permeability roof water at low cost is needed.
In order to solve the above problems, the present embodiment provides a method for draining low-permeability roof water, which utilizes the good permeability of the aquifer 12 to gas, so as to fill air into the tiny pores of the aquifer 12 to replace the underground water therein, and drive the pore water to flow in a direction with low pressure, and finally flow out of the hydrophobic pores 5 with the pressure of the second lane 2 (lower lane) being 0 (where the pressure is 0 is only convenient for those skilled in the art to understand the present embodiment, and is not a limitation), thereby achieving roof water drainage; compared with the traditional draining method, the method can obviously improve the drainage efficiency, and can effectively reduce the cost of draining the low-permeability roof water so as to at least solve the problem of high cost of draining the low-permeability roof water by the traditional hydraulic fracturing method.
For the purpose of facilitating understanding of the embodiments of the present application, a working surface of a mineral in inner Mongolia will be described in detail, and the water-resisting layer 11 and the coal seam 13 are schematically shown in the drawings; specifically, according to the ancient and near old lignite mined by the coal mine, the thickness of a coal layer 13 is 6m, the inclination angle is about 5 degrees, the coal layer runs towards a longwall type arrangement working face, mining is carried out by a comprehensive roof caving method, and a free-falling type management roof plate 3 is adopted; the coal seam roof 3 is an ancient close-series fine-grained sandstone aquifer 12, the thickness of the aquifer is 80m, the permeability coefficient of the aquifer is 0.0095, and the water pressure of the aquifer is 2 MPa; the water damage is treated by adopting an advanced drainage method on the prior working face, the average water inflow amount of a single hole is 0.85m & lt 3 & gt/d (wherein d refers to day), and the water amount is very little; during the extraction period, the water spraying of the tunnel face top plate 3 is large, the average water spraying is about 400m3/h (h refers to hour), and the working environment is severe; the method of the embodiment of the application is adopted to treat the water damage of the working face, wherein the working face is an obliquely arranged working face.
Referring to fig. 1-2, a method of draining low permeability roof water according to an embodiment of the present application includes drilling aeration holes 4 in an aquifer 12 of a roof 3 of a first lane 1 of a working face; drilling a hydrophobic hole 5 in the aquifer 12 of the roof 3 of the second lane 2 of the face; aerating the aeration hole 4 to discharge water passing through the aquifer from the hydrophobic hole 5; if the working face is the inclined working face, the first lane 1 and the second lane 2 are an upper lane and a lower lane respectively.
For example, during the tunneling of the working face, hydrogeological observation of the working face reveals that about 15m from the cutting hole outwards, the lithology of the top plate 3 is medium sandstone, the water spraying amount of the top plate 3 per 10m on average in a medium sandstone section can be 1.5h, the lithology of the top plate 3 in other areas is fine sandstone, and the water inflow amount per 10m can be 0.1m 3/h; accordingly, the arrangement scheme of the inflation holes 4 is as follows: the upper lane inflation hole 4 starts numbering from the hole cutting: c1, C2, … …, Cn; similarly, the numbers of the hydrophobic holes 5 corresponding to the lower lane are S1, S2, … … and Sn; the distance between the C1 inflation hole 4 and the inner wall of the incision can be 20m, the distance between the C1 and the inflation hole 4 of the C2 can be 80m, and the hole distance between other inflation holes 4 can be 50 m; correspondingly, the distance between the S1 hydrophobic hole 5 and the tangential hole can be 20m, the distance between the S1 hydrophobic holes 5 and the S2 hydrophobic holes 5 can be 80m, and the distance between the other hydrophobic holes 5 can be 50 m.
Constructing a huge-thickness low-permeability aquifer 12 on the top plate 3 from the cut hole in the upper lane of the working face according to the determined distance between the inflation holes 4, and drilling a plurality of inflation holes 4 for inflation; the aeration hole 4 can point to the inner side of the working surface, the inclination angle can be 45-60 degrees, and the final hole can be positioned at the top interface of the aquifer 12; constructing a huge-thickness low-permeability aquifer 12 to the top plate 3 at the same interval of the hydrophobic holes 5 from the cut hole in the lower lane, wherein the hydrophobic holes 5 are used for hydrophobic; the aeration holes 4 may be directed at the working surface at an angle of 60-75 ° and the final hole may be located at the top interface of the aquifer 12;
wherein the air pressure for inflating the inflation holes 4 is greater than the water pressure of the aquifer 12; specifically, the pressure of the air for inflating the inflation hole 4 may be 1.5 times or more of the water pressure of the aquifer 12, and in other examples, the pressure may be 1.5 times or 1.8 times, as long as the corresponding function/action/effect is achieved.
In the embodiment of the application, air is filled into tiny pores of the aquifer 12 by utilizing good permeability of the aquifer 12 to gas so as to replace underground water in the aquifer 12, pore water is driven to flow in a direction with low pressure, and finally the pore water flows out of the hydrophobic hole 5 with the pressure of 0 in the second lane 2 (lower lane), so that roof water is drained; compared with the traditional dredging method, the dewatering efficiency is obviously improved, and compared with the hydraulic fracturing method, the cost for dredging and releasing low-permeability roof water can be effectively reduced, specifically:
because the hydraulic fracturing method generally pumps the mixed liquid of water, sand and chemical reagent into the rock deep in the stratum under the pressure, a large amount of water resources, chemical reagent and the like are consumed, and the air is used for replacing the chemical reagent and the water, so that the cost for draining and discharging low-permeability roof water is reduced; in addition, because this application embodiment need not to pass through sand, still saved manpower and material resources cost.
In addition, the embodiment of the application measures the water inflow of the aquifer 12 of the roof 3 by analyzing the lithology of the aquifer 12 of the roadway roof 3 and segmenting, and is taken as a basis, namely if the grains of the sandstone aquifer 12 of the roof 3 are coarse or the water inflow is large, the set distance between the aeration holes 4 is large; otherwise, the water is small, so that the efficiency of subsequently draining low-permeability roof water is improved.
Referring to fig. 2, the embodiment of the present application may inflate the inflation hole 4 through the pressure device 7; the pressure device 7 is connected with the inflation hole 4 through the hole sealing capsule 6; the pressure device 7 may include an air inlet pipe 71, a booster air pump 72, an inlet pipe 73 and a booster water pump 74, wherein the booster air pump 72 is connected with the other end of the air inlet pipe 71; one end part of the water inlet pipe 73 is connected with the hole sealing capsule 6;
for example, a hose may be connected to the inlet of the booster pump 72 at a distance of 100m from the top lane; the air outlet of the booster air pump 72 can be connected with a four-way (the four-way is also called a flow divider) by a high-pressure hose or a hard pipe; a booster water pump 74 may be disposed on a side adjacent to the booster air pump 72; a 1in faucet may be installed in an existing water pipe in the roadway adjacent booster pump 74; a faucet may be used to pressurize the water pump 74 until full.
This application embodiment is through setting up hole sealing capsule 6 to prevent that the body of aerifing from letting out from the drill way of aerifing hole 4, with the guarantee the body of aerifing can all get into aquifer 12, with the groundwater that the expulsion was given to deposit in the hole of aquifer 12 and the crack flows to lower lane drain hole 5, prevents to influence the efficiency of dredging the water because of gas leakage (unloading).
In addition, the embodiment of the application is provided with the air inlet pipe 71 and the pressurization air pump 72 to pressurize and inflate the inflation hole 4, so that the water in the aquifer is discharged through the drainage hole 5; through setting up inlet tube 73 and booster pump 74 to utilize water pressure to make it swell hole sealing capsule 6, thereby play the effect of sealed gas charging hole 4, and then the groundwater that the expulsion was deposited in aquifer 12 hole and crack flows to lower lane hydrophobic hole 5, prevents to influence the efficiency of dredging the water because of leaking gas (unloading).
With continued reference to fig. 2, the number of the inflation holes 4 of the embodiment of the present application may be more than 2, and each inflation hole 4 is arranged at intervals; more than 2 inflation holes 4 are respectively and correspondingly connected with more than 2 air inlet pipes 71 and more than 2 water inlet pipes 73, and the other end parts of more than 2 air inlet pipes 71 and more than 2 water inlet pipes 73 are respectively connected with a booster air pump 72 and a booster water pump 74 through a first multi-way device 8 and a second multi-way device 9; the other end parts of more than 2 air inlet pipes 71 and more than 2 water inlet pipes 73 are respectively connected with the first multi-way device 8 and the second multi-way device 9 through more than 2 corresponding valves 10.
The embodiment of the application improves the efficiency of draining water by arranging more than 2 air charging holes 4; the range of water drainage is enlarged by arranging the air charging holes 4 at intervals, so that the water drainage efficiency is improved; the number of the booster pumps 72 and 74 is reduced by arranging the first multi-way device 8 and the second multi-way device 9, so that more than 2 inflation holes 4 can be inflated by 1 booster pump 72 and 1 booster pump 74, and the cost of draining water is saved; in addition, by arranging more than 2 valves 10, the independent control of the air pressure of the air charging hole 4 is realized, so that the adjustment (transfer) of the air pressure is realized by the valves 10, namely, the valves 10 are arranged to play a role in manual pressurization or pressure relief.
For example, the following operations may be performed:
in the upper lane, a drill rod with the diameter of 42mm is used for installing the hole sealing capsule 6 in C1-C4 of the air inflation hole 4, the installation depth is 10m, one end of a water injection pressurizing hose (the inner diameter is about 5-10 mm) with enough length is connected with the hole sealing capsule 6, and the other end of the water injection pressurizing hose is connected with a cross joint of an outlet of a pressurizing water pump 74, so that a complete water flow system for pressurizing and filling the hole sealing capsule 6 is formed; meanwhile, one end of an inflatable pressurization hose which is long enough and has the diameter of 25mm is connected with the pressurization air pump 72, and the other end of the inflatable pressurization hose is connected with the tail end of the drill rod of the inflation hole 4, so that a complete inflation system is formed;
starting a booster water pump 74 to boost the hole sealing capsules 6 until the pressure of each air charging hole 4 hole sealing capsule 6 reaches 5MPa, and maintaining the pressure; if the water level in the water tank of the booster pump 74 is too low, water should be replenished in time.
Opening the valve 10 to supply air to the booster air pump 72; starting the gas pressurization air pump 72, and inflating the installed inflation hole 4 at the pressure of 3MPa through the four-way joint; when the air is inflated for a certain time, the flow of the drainage holes 5 in the lower lane is gradually increased, and the effect of air inflation and drainage is achieved;
it should be noted that the water inflow of other open inflation holes 4 in the upper roadway may also increase, which is a normal phenomenon; if the air leakage is gradually changed, the sealing capsule 6 is used for sealing; if the air pressure of the charging hole is not up to the preset requirement, but the flow rate of the drainage hole 5 is obviously increased, the operation can be continued at the pressure.
If the charge port pressure is not up to the predetermined pressure and the drain port 5 flow rate does not increase significantly, then the booster pump needs to be added until the pressure is reached or the drain port 5 flow rate meets the predetermined requirement.
When the working face begins to recover, the air charging hole 4C1 close to the cutting hole cannot work due to physical interference of construction of the working face and the like; at this point, the inflation of the C1 orifice should be stopped; the sequence is as follows: closing an inflation valve 71 of the sealing capsule 6 → closing a water inlet valve 10 of the sealing capsule 6 → opening a pressure relief valve 10 of the sealing capsule 6 to drain the water pressure of the capsule, so that the capsule contracts → disassembling a drill rod of the inflation hole 4 → taking out the sealing capsule 6; the other inflation holes 4 remain in operation.
And installing the hole sealing capsule 6 in the C4 inflating hole 4 in the same way.
The above operation is repeated so that the inflation holes 4 and the booster air pump 72 and the booster water pump 74 roll forward with the advance of the working surface until all the inflation holes 4 in the working surface are completely inflated.
It should be noted that, for a horizontal working face which cannot divide an upper lane and a lower lane, a return air lane can be selected as a lane of the inflation hole 4, and a transportation lane is selected as a lane of the drainage hole 5; on the contrary, the present invention is not particularly limited to the embodiments.
It should also be noted that if the aeration drying-out speed does not meet the production requirement, the number of aeration holes 4, the number of aeration pumps and the pressure of aeration can be increased.
In an alternative example, the first manifold 8 may be a gas distributor;
in the embodiment of the application, the first multi-channel device 8 is set as a gas distributor, so that people can freely and dynamically adjust the flow of multi-channel output gas; for example, the gas distributor may be embodied in chinese patent application with publication number CN201431859, or may be of any other suitable type.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present application, and are not limited thereto; although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A method of draining low permeability roof water, comprising:
drilling a gas filling hole (4) in a roof aquifer (12) of a first lane (1) of the working face;
drilling a drainage hole (5) in a roof aquifer (12) of a second lane (2) of the working face;
inflating the inflation holes (4) to drain water through the drainage holes (5);
wherein,
and if the working face is obliquely arranged, the first lane (1) and the second lane (2) are an upper lane and a lower lane respectively.
2. The method of dredging low permeability roof water of claim 1, wherein the pitch of the aeration holes (4) is determined by analyzing lithology of the roadway roof aquifer (12) and measuring water inflow of the roof aquifer (12) in sections.
3. A method for dredging low permeability roof water according to claim 2, wherein the pitch of the aeration holes (4) is determined based on the advancing speed through the working face.
4. A method of dredging low permeability roof water according to claim 1, characterized in that the air pressure for inflating the inflation holes (4) is higher than the aquifer (12) water pressure.
5. A method of dredging low permeability roof water according to claim 4, characterized in that the air pressure for aerating the aeration hole (4) is not less than 1.5 times the water pressure of the aquifer (12).
6. Method for dredging low permeability roof water according to claim 1, characterized in that the aeration of the aeration holes (4) is performed by means of a pressure device (7).
7. Method for draining low permeability roof water according to claim 1, characterized in that the pressure means (7) is connected to the aeration hole (4) by a sealing capsule (6).
8. Method for draining low-permeability roof water according to claim 7, characterized in that said pressure means (7) comprise:
an air inlet pipe (71), one end part of which is communicated with the hole sealing capsule (6);
the supercharging air pump (72) is connected with the end part of the other end of the air inlet pipe (71);
the end part of one end of the water inlet pipe (73) is connected with the hole sealing capsule (6);
a booster water pump (74); is connected with the other end part of the air inlet pipe (71).
9. The method for dredging low-permeability roof water according to claim 8, wherein the number of the aeration holes (4) is more than 2, and each aeration hole (4) is arranged at intervals;
more than 2 inflation holes (4) are respectively and correspondingly connected with more than 2 air inlet pipes (71) and more than 2 water inlet pipes (73), and the other end parts of more than 2 air inlet pipes (71) and more than 2 water inlet pipes (73) are respectively connected with the booster air pump (72) and the booster water pump (74) through a first multi-channel device (8) and a second multi-channel device (9);
the number of the air inlet pipes (71) is more than 2, the end part of the other end of the water inlet pipe (73) is respectively connected with the first multi-way device (8) and the second multi-way device (9) through corresponding valves (10) which are more than 2.
10. Method of draining low permeability roof water according to claim 9, characterized in that the first manifold (8) is a gas distributor.
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