CN113236359B - Separation layer water drainage method, separation layer water drainage roadway system and construction method - Google Patents
Separation layer water drainage method, separation layer water drainage roadway system and construction method Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 257
- 238000000926 separation method Methods 0.000 title claims abstract description 166
- 238000010276 construction Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005065 mining Methods 0.000 claims abstract description 66
- 239000003245 coal Substances 0.000 claims abstract description 50
- 239000011435 rock Substances 0.000 claims description 12
- 230000032798 delamination Effects 0.000 claims description 6
- 230000035699 permeability Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 2
- 230000006578 abscission Effects 0.000 claims 4
- 238000009825 accumulation Methods 0.000 abstract description 4
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 5
- 238000005553 drilling Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 239000003657 drainage water Substances 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012804 iterative process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
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- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
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Abstract
The invention discloses a method for draining separation layer water, a separation layer water drainage roadway system and a construction method, wherein the method for draining separation layer water comprises the following steps: s1: each coal face is uniformly provided with a separation layer water drainage roadway; s1.1, determining the ratio drop of a top plate, a roadway head, a roadway tail and a roadway bottom of a separation layer water drainage roadway; s1.2: calculating to obtain construction parameters of the separation layer water drainage roadway, namely the actual roadway width B and the actual roadway height h of the separation layer water drainage roadwayLane(ii) a S2: and (3) arranging a mining area concentrated drainage roadway penetrating through the coal mining area along the direction of going up the mountain, and communicating the separation layer water drainage roadway with the mining area concentrated drainage roadway to discharge the separation layer water. The invention constructs the water drainage lane of the separation layer in the separation layer area, drains the water of the water-filled aquifer of the separation layer in advance, the water released by the deformation and the damage of the water-filled aquifer of the separation layer in the stope stoping process can be collected into the centralized water drainage lane of the stope through the drainage lane, and finally collected into the sump to be discharged through the pump house, thus completely realizing the drainage of the water immediately and avoiding the water accumulation of the separation layer.
Description
Technical Field
The invention belongs to the technical field of coal mine roof water control, and particularly relates to a separation water drainage method, a separation water drainage roadway system and a construction method.
Background
At present, a method for preventing and controlling the water damage of the separated layer mainly comprises drilling detection and discharge, and the implementation mode comprises the steps of constructing a through type drainage hole from the ground and constructing a diversion hole from an underground roadway. Most of the lower part of the separation layer is mudstone, the lower rock layer is broken under coal mining disturbance, the underground and ground drilling construction needs a long distance (200-300 m) to pass through a broken zone, drilling accidents such as hole shrinkage, jamming, hole plugging and the like often occur, the hole is difficult to form, and the instant hole-forming hole body structure cannot be kept stable for a long time. Meanwhile, the delamination develops dynamically along with the advancing of the working face, in addition, the stratum development has heterogeneity, the forming position and the forming time are difficult to predict and grasp, and the delamination water detection and amplification work has great uncertainty.
Disclosure of Invention
The invention provides a method for draining separation layer water, a separation layer water drainage roadway system and a construction method, and solves the problems that in the prior art, hole forming of a drill hole is difficult and exploration accuracy is low when exploration and drainage are carried out by utilizing a drill hole after formation of the separation layer water. The invention realizes instant discharge of the separation layer water by using the separation layer water drainage roadway, and effectively solves the problem of separation layer water accumulation.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a delamination water drainage method comprises the following steps:
S1: each coal face is uniformly provided with a separation layer water drainage roadway;
s1.1, determining the ratio drop of a top plate, a roadway head, a roadway tail and a roadway bottom of a separation layer water drainage roadway;
calculating to obtain the height of a water flowing fractured zone according to the mining parameters of the coal bed; the vertical direction of the water-guiding fractured zone is upward, a first hard rock stratum is found, the hard rock stratum is used as a top plate of the separation water drainage roadway, and the roadway bottom ratio of the separation water drainage roadway is reduced to 1/1000-1/1500; in the vertical direction, the position of the tunnel tail of the separation layer water drainage tunnel is the same as the position of the cut-off starting end of the coal face, and the tunnel head of the separation layer water drainage tunnel is 40-60 m away from the coal mining stopping line;
s1.2: calculating to obtain construction parameters of the separation layer water drainage roadway, namely the actual roadway width B and the actual roadway height h of the separation layer water drainage roadwayLane；
S1.21 according to the set initial lane width B0Calculating to obtain the water depth h of the separated layer water drainage roadwayWater (W)And the cross-sectional area A (m)2) The formula is as follows:
hwater (W)-depth of water m in the separation water drainage roadway; n-constant, taking 2.35-2.80; q-water filling strength of separation layer water drainage roadway, m3/s；B0And setting an initial value m of the lane width of the separation water drainage lane.
In the formula: n-the roughness of the separation layer water drainage roadway is 0.020-0.025; i-drainage roadway bottom gradient;
in the formula, L represents the length of a separation layer water drainage roadway, and m represents the length of the separation layer water drainage roadway; k is the permeability coefficient of the aquifer, m/s; h-head of confined aquifer, m; m is the thickness of the confined aquifer, M; r-radius of influence, m;
S1.22, obtaining the lane width B of the separation layer water drainage lane;
width of lane
If B is equal to B0And finishing the calculation; if B is finally calculated<2m, taking B as 2 m;
if B ≠ B0Then return to S1.21, i.e. reset B0Is B0And the arithmetic mean value of B, and carrying out iterative calculation according to the arithmetic mean value until B is equal to B0；
S1.23 obtaining lane height h of separation layer water drainage laneLane；
High of lane hLane＝(1～1.2)*B；
S2: and (3) arranging a mining area concentrated drainage roadway penetrating through the coal mining area along the direction of going up the mountain, and communicating the separation layer water drainage roadway with the mining area concentrated drainage roadway to discharge the separation layer water.
Optionally, calculating the height of the water-flowing fractured zone according to the following formula:
Hd＝4.82M0+60.13ln(s/100)+3.43M0ln(b/100)+16.17；
in the formula, Hd-height of water-flowing fractured zone, m; m0Mining the thickness of the coal seam, m; s-mining depth, m; b-inclined width of working surface, m.
Optionally, an inclined roadway is arranged for communicating the separation layer water drainage roadway with the mining area centralized water drainage roadway, construction parameters of the inclined roadway are the same as those of the separation layer water drainage roadway, and the inclined angle of the inclined roadway does not exceed 30 degrees according to the calculation of the cross angle of the inclined roadway and the horizontal plane.
Optionally, a plurality of water silos and pump rooms are communicated with the concentrated drainage roadway of the mining area.
A separation layer water drainage roadway system is characterized in that mining area concentrated drainage roadways are arranged through a coal mining area along the direction of ascending mountains;
And each coal face is uniformly provided with a separation layer water drainage roadway which is communicated with the centralized drainage roadway of the mining area through an inclined roadway.
Optionally, the separation layer water drainage roadway is arranged along the center of the strike of the coal face.
Optionally, a plurality of water silos and pump rooms are further arranged to communicate with the centralized drainage roadway of the mining area.
Optionally, the ratio of the top plate, the roadway head, the roadway tail and the roadway bottom of the separation layer water drainage roadway is reduced as follows: calculating to obtain the height of a water flowing fractured zone according to mining parameters of a coal bed; the vertical direction of the water-guiding fractured zone is upward, a first hard rock stratum is found, the hard rock stratum is used as a top plate of the separation water drainage roadway, and the roadway bottom ratio of the separation water drainage roadway is reduced to 1/1000-1/1500; in the vertical direction, the position of the tunnel tail of the separation layer water drainage tunnel is the same as the position of the cut-off starting end of the coal face, and the tunnel head of the separation layer water drainage tunnel is 40-60 m away from the coal mining stopping line.
Optionally, calculating to obtain construction parameters of the separation layer water drainage roadway, namely the actual roadway width B and the actual roadway height h of the separation layer water drainage roadwayLane；
S2.21 according to designDetermined initial lane width B0Calculating to obtain the water depth h of the separated layer water drainage roadwayWater (W)And the cross-sectional area A (m)2) The formula is as follows:
hwater (W)-depth of water m in the separation water drainage roadway; n-constant, taking 2.35-2.80; q-water filling strength of separation layer water drainage roadway, m 3/s；B0And setting an initial roadway width value m of the separation water drainage roadway.
In the formula: n-the roughness of the separation layer water drainage roadway is 0.020-0.025; i-drainage roadway bottom gradient;
in the formula, L represents the length m of the separation layer water drainage roadway; k is the permeability coefficient of the aquifer, m/s; h is the head of confined aquifer, m; m is the thickness of the confined aquifer, M; r-radius of influence, m;
s2.22, obtaining the lane width B of the separation layer water drainage lane;
width of lane
If B is equal to B0And finishing the calculation; if B is finally calculated<2m, taking B as 2 m;
if B ≠ B0Then return to S1.21, i.e. reset B0Is B0And the arithmetic mean value of B, and carrying out iterative calculation according to the arithmetic mean value until B is equal to B0；
S2.23 obtaining lane height h of separation layer water drainage laneLane；
High of lane hLane＝(1～1.2)*B。
A construction method of a separation layer water drainage roadway system is provided, wherein the separation layer water drainage roadway system is the separation layer water drainage roadway system provided by the invention;
the construction method comprises the following steps:
step one, arranging a mining area concentrated water drainage roadway, a water sump and a pump house through a coal mining area along the direction of going up a hill;
step two, obtaining construction parameters of a separation layer water drainage roadway, communicating the construction parameters with a centralized drainage roadway of a mining area, and excavating inclined roadways according to the construction parameters of the separation layer water drainage roadway;
And thirdly, according to the obtained roof, the roadway head, the roadway tail and the roadway bottom of the separation water drainage roadway and the construction parameters, digging the separation water drainage roadway by taking the roadway tail of the inclined roadway as the roadway head of the separation water drainage roadway.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention constructs the separation layer water drainage roadway in the separation layer area, drains the water in the separation layer water-filled aquifer in advance, and the water released by the deformation and damage of the separation layer water-filled aquifer can be collected into the centralized drainage roadway of the mining area through the drainage roadway in the working face stoping process and finally collected into the sump to be discharged through the pump house, so that the drainage of the existing water is completely realized, and the separation layer water accumulation is avoided.
2. The separated layer water drainage roadway is constructed before stoping of a working face, so that construction is not influenced by mining disturbance, and the defects that a water detection and drainage hole is difficult to form and the structure of a hole body is unstable in the prior art are overcome.
3. The separated layer water drainage roadway provided by the invention integrally penetrates through the separated layer area, and the defect of inaccurate exploration in the prior art is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure, but do not constitute a limitation of the disclosure. In the drawings:
Fig. 1 is a schematic plan view of the arrangement of the delamination water drainage roadway system of the invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1;
fig. 4 is a schematic perspective view of the separated layer water drainage roadway system of the present invention;
in the figure, 1-coal face, 2-air lane, 3-machine lane, 4-separated layer water drainage lane, 5-inclined lane, 6-mining area centralized water drainage lane, 7-water sump, 8-coal bed, 9-cut hole, 10-sand-mud rock stratum, 11-gravel stratum, 12-separated layer, 13-water diversion fracture zone and 14-pump room;
the arrows in fig. 4 indicate the direction of water flow.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings. It should be understood that the following embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the invention in any way, and all technical solutions using the embodiments, including simple changes made to the embodiments, are within the scope of the present invention.
So that the manner in which the above recited features of the present invention can be understood and appreciated, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings.
The delamination water drainage method comprises the following steps:
s1: each coal face 1 is uniformly provided with a separation layer water drainage roadway 4;
s1.1, determining the ratio drop of a top plate, a roadway head, a roadway tail and a roadway bottom of a separation layer water drainage roadway 4;
calculating to obtain the height of the water flowing fractured zone according to the mining parameters of the coal bed (8); calculating the height of the water flowing fractured zone according to the following formula:
Hd＝4.82M0+60.13ln(s/100)+3.43M0ln(b/100)+16.17；
in the formula, Hd-height of water-flowing fractured zone, m; m is a group of0Mining the thickness of the coal seam, m; s-mining depth, m; b-working surfaceWidth of slant, m.
The method comprises the steps of firstly determining the position of the water-flowing fractured zone according to geological data around a mine, calculating to obtain the height of the water-flowing fractured zone, determining the position of the water-flowing fractured zone according to the height of the water-flowing fractured zone, and determining the position of the separation water drainage roadway 4 by taking the highest point of the water-flowing fractured zone as a starting point along the vertical direction.
The water-conducting fractured zone is vertically upward, a first hard rock stratum is found, a softer soil layer is usually arranged below the hard rock stratum and can be used as an excavation position, the hard rock stratum is used as a top plate of the separation layer water drainage roadway 4, and the ratio of the bottom of the separation layer water drainage roadway 4 is reduced to 1/1000-1/1500; in the vertical direction, the position of the tail of the tunnel of the separation layer water drainage tunnel 4 is the same as the position of the starting end of the cut-out hole 9 of the coal face 1, and the tunnel head of the separation layer water drainage tunnel 4 is 40-60 m away from the coal mining stop line;
S1.2: calculating to obtain construction parameters of the separation layer water drainage roadway (4), namely the actual roadway width B and the actual roadway height h of the separation layer water drainage roadwayLane；
S1.21 according to the set initial lane width B0Calculating to obtain the water depth h of the separated layer water drainage roadwayWater (I)And cross-sectional area A (m)2) The formula is as follows:
hwater (I)-depth of water m in the separation water drainage roadway; n-constant, taking 2.35-2.80; q-water filling strength of separation layer water drainage roadway, m3/s；B0And setting an initial value m of the lane width of the separation water drainage lane.
In the formula: n-the roughness of the separation layer water drainage roadway is 0.020-0.025; i-drainage roadway bottom gradient;
in the formula, L represents the length of a separation layer water drainage roadway, and m represents the length of the separation layer water drainage roadway; k is the permeability coefficient of the aquifer, m/s; h-head of confined aquifer, m; m is the thickness of the confined aquifer, M; r-radius of influence, m;
s1.22, obtaining the lane width B of the separation layer water drainage lane;
width of lane
If B is equal to B0And finishing the calculation; if B is finally calculated<2m, taking B as 2 m;
if B ≠ B0Then return to S1.21, i.e. reset B0Is B0And the arithmetic mean value of B, and carrying out iterative calculation according to the arithmetic mean value until B is equal to B0；
S1.23 obtaining lane height h of separation layer water drainage laneLane；
High of lane hLane＝(1～1.2)*B；
S2: and a mining area concentrated water drainage roadway 6 is arranged to penetrate through the coal mining area along the upward direction, and the separation layer water drainage roadway 4 is communicated with the mining area concentrated water drainage roadway 6 to discharge separation layer water. According to the determined positions and parameters, the inclined roadway 5 is constructed from the concentrated drainage roadway 6 to the position intersected with the separation layer water drainage roadway 4, the section size of the inclined roadway 5 is consistent with that of the separation layer water drainage roadway 4 (namely the construction parameters are consistent), and the separation layer water drainage roadway 4 is constructed again by taking the tail of the inclined roadway 5 as a starting point until the tail of the inclined roadway is flush with the cut hole 9.
According to the working face replacing sequence, a separation layer water drainage roadway 4 is constructed in sequence before stoping of a coal face 1, drainage water flows into a centralized drainage roadway 6 of a mining area through an inclined roadway 5, and finally flows into a water sump 7 and is discharged out of a mine through a pump room 14.
With reference to fig. 1-4, the separation layer water drainage roadway system of the invention is provided with a mining area centralized drainage roadway 6 penetrating a coal mining area along the direction of ascending a mountain; each coal face 1 is uniformly provided with a separated layer water drainage roadway 4, and the separated layer water drainage roadway 4 is communicated with a mining area centralized drainage roadway 6 through an inclined roadway 5. The drainage water flows into a centralized drainage roadway 6 of the mining area through an inclined roadway 5, finally flows into a sump 7 and is discharged out of the mine through a pump house 14.
In the embodiment of the present disclosure, the separation layer water drainage roadway 4 is arranged along the strike center of the coal face 1. The advantage of setting up like this is that separation layer water drainage roadway is located separation layer district settlement center, is favorable to separation layer water to collect.
In the embodiment of the present disclosure, a plurality of water silos 7 and pump rooms 14 are also provided in communication with the district centralized drainage roadway 6.
A construction method of a separation layer water drainage roadway system comprises the following steps:
step one, arranging a mining area concentrated water drainage roadway 6, a water sump 7 and a pump room 14 through a coal mining area along the direction of going up a hill;
step two, obtaining construction parameters of the separation layer water drainage roadway 4, communicating the construction parameters with the centralized drainage roadway 6 of the mining area, and excavating an inclined roadway 5 according to the construction parameters of the separation layer water drainage roadway 4;
And step three, digging the separation layer water drainage lane 4 by taking the tail of the inclined lane 5 as the head of the separation layer water drainage lane 4 according to the obtained roof, head, tail and bottom of the separation layer water drainage lane 4 and construction parameters.
The first embodiment is as follows:
3# coal of Yanan group for coal mining in Shanxi Huang Jurassic coal field has an average thickness of 11m and an average inclination angle of 6 deg. As shown in fig. 1, 7 coal faces 1 are arranged in the stope. Referring to fig. 2, the main strata of the 3# coal overburden from the bottom to the top are a sandstone and clay stratum 10 of the Zuo group and the stabilized group, a conglomerate stratum 11 of the Yijun group, a sandstone and soil layer of the Luhe group. The water-flowing fractured zones 13 are mainly distributed in the sand shale layer 10. The separation layer 12 is mainly formed at the contact surface of the conglomerate layer 11 and the sand-shale layer 10. The conglomerate 11 of the Yijun group is a main water-filled aquifer of a separation layer, the unit water inflow q is 0.00018-0.03796L/(s.m), the permeability coefficient K is 0.000481-0.0502 m/d, and the water-rich property is weak. A working surface is taken as an example to be explained as follows.
Step 1: thickness M of coal seam 8 from geological data and mining design010m, a mining depth s of 500m, a working face slant width b of 155m, and a formula Hd＝4.82M0+60.13ln(s/100)+3.43M0ln (b/100) +16.17 calculates the height H of the water-flowing fractured zonedIs 182.5 m.
As shown in fig. 2, the conglomerate layer 11 of the Yijun group is 260m away from the coal seam 8, and the water-flowing fractured zone 13 does not reach the conglomerate layer 11.
And 2, step: determining the construction position of the separation layer water drainage roadway 4;
as shown in fig. 3, the conglomerate layer 11 of the Yijun group is the first hard rock layer above the water-flowing fractured zone 13, the separated layer water drainage roadway 4 is arranged in the sandstone layer 10 at the bottom of the conglomerate layer 11, the conglomerate layer 11 serves as the top plate of the drainage roadway, and the roadway bottom ratio is reduced 1/1000. As shown in fig. 1, a separation layer water drainage roadway 4 on a plane is arranged along the direction center of a coal face 1, a roadway tail is flush with a cut hole 9 of the face, a roadway head is communicated with a mining area centralized drainage roadway 6 through an inclined roadway 5 at a position 50m outside a stope line, and the coal face 1 is provided with an air roadway 2 and a machine roadway 3.
And 3, step 3: and calculating the water filling strength of the separation layer water drainage roadway 4.
The water filling strength is calculated according to the principle that water enters from two sides and two ends of the water collecting gallery method, and the calculation formula is as follows:
in the formula, Q is water filling strength, m3S; l is the length of the separation layer water drainage roadway, m; k is the permeability coefficient of the aquifer, m/s; h-head of confined aquifer, m; m is the thickness of the confined aquifer, M; r-radius of influence, m; b is0-initial value of width, m, of the deplating water drainage roadway.
In this example, L is 1400M, K is 0.05M/s, H is 173M, M is 164M, calculated as R386.84M, B02.00m, calculated to give Q0.08 m3/s。
And 4, step 4: and determining the water cross section area of the separation layer water drainage roadway.
The cross-sectional area of the water is calculated according to the following formula:
in the formula: h is a total ofWater (I)Dredging roadway water depth m; n-constant, taking 2.35-2.80; a-water cross-sectional area of separation layer water drainage roadway, m2(ii) a n-the roughness of the separation layer water drainage roadway is 0.020-0.025; i-the ratio of the bottom of the drainage roadway is reduced.
And 5: determining the cross-sectional dimension of drainage roadway
Width of lane
And not less than 2 m;
step 6: step 3 to step 5 are carried out with combined iterative calculation, the initial value of B is set to be 2m, and Q, h are calculated in sequenceWater (W)And A, then B and B are calculated0Comparing, if they are not identical, adopting iterative calculation to set reinitiate value B0Is B and B0Is calculated to finally make B equal to B0And the calculation is finished.
The specific iterative process is as follows:
| number of iterations | B0(m) | Q(m3/s) | hWater (W)(m) | A(m2) | B(m) | Remarks for note |
| 1 | 2.00 | 0.08 | 2.35 | 0.41 | 0.03 | |
| 2 | 1.02 | 0.08 | 1.20 | 0.31 | 0.10 | |
| 3 | 0.56 | 0.08 | 0.65 | 0.24 | 0.28 | |
| 4 | 0.42 | 0.08 | 0.49 | 0.21 | 0.45 | |
| 5 | 0.43 | 0.08 | 0.50 | 0.22 | 0.43 | B＝B0End of calculation |
Through iterative calculation, B is 0.43m, Q is 0.08m3/s，hWater (W)＝0.50m，A＝0.22m2. Due to calculated B<2m, so, B is chosen to be 2.00 m.
And 7: lane height h 1.1B 2.20m
And 8: and (3) constructing an inclined roadway 5 from the upper mountain of the concentrated drainage roadway 6 of the mining area to a position intersected with the separation layer water drainage roadway 4 according to the position determined in the step 2 and the parameters calculated in the steps 3-7, wherein the section size B multiplied by h of the inclined roadway 5 and the separation layer water drainage roadway 4 is 2m multiplied by 2.2m, and constructing the separation layer water drainage roadway 4 to be flush with the cut hole 9 according to the designed roadway bottom ratio 1/1000.
As shown in fig. 4, according to the working face replacing sequence, a to-be-mined working face separation water drainage roadway 4 is constructed in sequence before the stope of the coal mining working face 1, drainage water flows into a mining area centralized drainage roadway 6 through an inclined roadway 5, and finally flows into a sump 7 and is discharged out of a mine through a pump room 14.
Before working face extraction, a separation layer water drainage roadway is constructed in a separation layer area in advance, and water in a separation layer water-filled aquifer is drained in advance; meanwhile, water released by deformation and damage of a separation water-filled aquifer in the working face stoping process can be converged into a centralized water drainage roadway of a mining area through a drainage roadway and finally converged into a sump to be discharged through a pump house, so that water is discharged immediately and separation water accumulation is avoided.
The separation layer water drainage roadway provided by the invention is constructed before stoping of the working face, and the separation layer water is drained when being filled with water in the stoping process and flows automatically completely, so that the construction is not influenced by mining disturbance, the defects of difficult pore forming of a water detection and drainage hole and unstable pore body structure in the prior art are avoided, and the shutdown and production of the working face caused by the lag of the separation layer water detection and drainage work or the handling of drilling accidents in the stoping process of the working face are also avoided.
The separation layer water drainage roadway provided by the invention integrally penetrates through the separation layer area in the moving direction and must pass through the sedimentation ponding center of each separation layer period, so that the defects of uncertain separation ponding center position and inaccurate drilling exploration in the prior art due to the periodic development of the separation layer are avoided.
The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details in the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the above embodiments, the various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations will not be further described in the present disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure as long as it does not depart from the gist of the present disclosure.
Claims (8)
1. A delamination water drainage method is characterized by comprising the following steps:
s1: each coal face (1) is uniformly provided with a separation layer water drainage roadway (4);
s1.1, determining the ratio drop of a top plate, a roadway head, a roadway tail and a roadway bottom of a separation layer water drainage roadway (4);
calculating to obtain the height of the water flowing fractured zone according to the mining parameters of the coal bed (8); the vertical direction of the water-guiding fractured zone is upward, a first hard rock stratum is found, the hard rock stratum is used as a top plate of the separation water drainage roadway (4), and the roadway bottom ratio of the separation water drainage roadway (4) is reduced to 1/1000-1/1500; in the vertical direction, the position of the tail of the separation layer water drainage roadway (4) is the same as the starting end of the cut hole (9) of the coal mining working face (1), and the roadway head of the separation layer water drainage roadway (4) is 40-60 m away from the coal mining stop line;
S1.2: calculating to obtain construction parameters of the separation layer water drainage roadway (4), namely the actual roadway width B and the actual roadway height h of the separation layer water drainage roadwayLane；
S1.21 according to the set initial lane width B0Calculating to obtain the water depth h of the separated layer water drainage roadwayWater (I)And cross-sectional area A, m2The formula is as follows:
hwater (I)The depth of the separated layer water drainage roadway is m; n-constant, taking 2.35-2.80; q-water filling strength of separation layer water drainage roadway, m3/s；B0Setting an initial value m of the lane width of the separation water drainage lane;
in the formula: n-the roughness of the separation layer water drainage roadway is 0.020-0.025; i-drainage roadway bottom gradient;
in the formula, L represents the length of a separation layer water drainage roadway, and m represents the length of the separation layer water drainage roadway; k is the permeability coefficient of the aquifer, m/s; h-head of confined aquifer, m; m is the thickness of the confined aquifer, M; r-radius of influence, m;
s1.22, obtaining the lane width B of the separation layer water drainage lane;
width of lane
If B is equal to B0And finishing the calculation; if B is finally calculated<2m, taking B as 2 m;
if B ≠ B0Then return to S1.21, i.e. reset B0Is B0The arithmetic mean of B;
s1.23 obtaining lane height h of separation layer water drainage laneLane；
High of lane hLane＝(1～1.2)*B；
S2: and a mining area centralized drainage roadway (6) is arranged to penetrate through the coal mining area along the upward direction, and the separation layer water drainage roadway (4) is communicated with the mining area centralized drainage roadway (6) to discharge separation layer water.
2. The abscission water drainage method according to claim 1, wherein the height of the water-flowing fractured zone is calculated according to the following formula:
Hd＝4.82M0+60.13ln(s/100)+3.43M0ln(b/100)+16.17；
in the formula, Hd-height of water-flowing fractured zone, m; m is a group of0Mining the thickness of the coal seam, m; s-mining depth, m; b-inclined width of working surface, m.
3. The method for draining the separated layer water according to the claim 1 or 2, characterized in that an inclined roadway (5) is arranged for communicating the separated layer water drainage roadway (4) with the mining area centralized drainage roadway (6), the construction parameters of the inclined roadway (5) are the same as the construction parameters of the separated layer water drainage roadway (4), and the inclined angle of the inclined roadway (5) is not more than 30 degrees calculated according to the crossing angle with the horizontal plane.
4. The method for draining the separated layer water according to the claim 1 or 2, characterized in that a plurality of water silos (7) and a plurality of pump rooms (14) are also arranged to be communicated with the mining area concentrated drainage roadway (6).
5. A separation water drainage roadway system, which is used for implementing the separation water drainage method of claim 1; the method comprises the following steps:
a mining area centralized drainage roadway (6) is arranged along the direction of going up the mountain and penetrates through the coal mining area;
each coal face (1) is uniformly provided with a separation layer water drainage roadway (4), and the separation layer water drainage roadway (4) is communicated with a mining area centralized water drainage roadway (6) through an inclined roadway (5).
6. The abscission water drainage roadway system according to claim 5, wherein the abscission water drainage roadway (4) is arranged along the center of the strike of the coal face (1).
7. The abscission water drainage roadway system according to claim 5, wherein a plurality of water silos (7) and a plurality of pump rooms (14) are further provided in communication with the mining area concentrated drainage roadway (6).
8. A construction method of a separation layer water drainage roadway system is characterized in that the construction method of the separation layer water drainage roadway system is used for constructing the separation layer water drainage roadway system according to any one of claims 5 to 7;
the construction method comprises the following steps:
step one, arranging a mining area concentrated water drainage roadway (6), a water sump (7) and a pump room (14) through a coal mining area along the direction of going up a hill;
step two, obtaining construction parameters of the separation layer water drainage roadway (4), communicating the construction parameters with the centralized drainage roadway (6) of the mining area, and excavating the inclined roadway (5) according to the construction parameters of the separation layer water drainage roadway (4);
and thirdly, according to the obtained roof, head, tail and bottom of the tunnel of the separation layer water drainage tunnel (4) and construction parameters, digging the separation layer water drainage tunnel (4) by taking the tail of the inclined tunnel (5) as the head of the separation layer water drainage tunnel (4).
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