CN108590716A - A kind of tunnel crosses rich water tomography tree root type and dredges water blockoff integral construction method - Google Patents

Abstract

The invention discloses an integrated construction method for dredging and blocking water by tree root type in a roadway passing through a water-rich fault. Firstly, a main borehole is constructed at a set position on the excavation contour line of the roadway, and then a tree is constructed in the main borehole according to the design. Root-type branch drilling, to ensure that the final hole positions of the main borehole and tree-root-type branch holes fall within the fault; during the drainage construction stage, the main borehole and the tree-root-type branch holes connected to it are used as drainage holes; In the grouting construction stage, the main borehole and the tree-root branch boreholes connected with it are used as the grouting holes. The invention has the advantages of simplicity, feasibility, economy and applicability, multiple functions of one hole, combination of dredging and plugging, safety and high efficiency, and provides a new method for roadways and tunnels to cross water-rich faults safely, efficiently and quickly.

Description

An integrated construction method for dredging and blocking water by tree root type in water-rich faults in roadways

technical field

The invention relates to an integrated construction method for tree-root type dredging and blocking of water-rich faults in roadways, which is suitable for underground projects such as coal mines, iron mines, non-ferrous metal mines, tunnels, subways, etc., and is a safe and efficient construction method for crossing water-rich faults method.

Background technique

my country is a country rich in resources such as coal and iron ore in the world. With the rapid expansion of the scale of resource mining and the increase of mining depth in our country, the water pressure suffered during mining is increasing, resulting in increased water inrush accidents in mines. According to the trend, my country's mines are one of the countries most seriously affected by floods in the world. Faults and their broken zones are common unfavorable geological bodies during the excavation of underground roadways. The faulted broken zone exists as a weak zone with low strength, easy deformation, high water permeability, poor water resistance and high water content; It is rich in water and can gather the groundwater in the aquifer of the upper and lower walls of the fault. It has abundant supply sources. If no special treatment technical measures are taken during the excavation of the roadway, disasters such as water inrush or mud inrush will occur in the roadway, and the normal production of the mine will be affected in light cases. , causing economic losses; severe cases cause partial or complete flooding of the mine, prolong the construction period of the mine or be forced to close the mine, and even cause major casualties and huge economic losses. At present, flood has become one of the major issues affecting mine safety production, and water disaster prevention and control has become one of the major research topics that all mining areas must face to ensure safe production.

After long-term mine water prevention and control research and field practice, at present mines mainly adopt two types of water prevention and control technologies: drainage and grouting water blocking (pre-grouting on the ground, pre-grouting on the working face, and advance pre-grouting on the roadway), and successfully solved the problem. A large number of technical problems have made a significant contribution to curbing the occurrence of mine water disaster accidents. However, the hydrogeological and engineering geological conditions in some mining areas in my country are extremely complex (large water content, high water supply, high water pressure, and developed fault structures), and the factors that cause mine flood accidents are also very complicated. At present, some drainage measures and grouting processes, etc. It is relatively single or highly targeted and poor in applicability, and has certain limitations in the actual engineering use process, resulting in unsatisfactory water control effects in mines; Due to the complexity and variability of water sources in water faults, it is often necessary to construct a large number of boreholes in order to ensure the formation of a water blocking curtain after grouting, which increases the amount of work and the cost of the project; and, affected by the existing construction technology level, drilling The construction quality of the holes cannot be fully guaranteed (some boreholes are too deviated during the construction process, causing them to fall outside the fault instead of entering the predetermined position in the fault; The formed grouting water blocking reinforcement rings do not intersect, and there are blank hole areas for grouting water blocking, which is not conducive to the grouting sealing and filling reinforcement of groundwater), resulting in poor effect of grouting water blocking. Therefore, there is an urgent need to develop a new mine water control technology that is simple, feasible, economical, multi-purpose, combined with blockage removal, safe and efficient.

Contents of the invention

Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an integrated construction method for dredging and blocking water by tree roots in over-water-rich faults in roadways. A new method of water control that is simple, feasible, economical, safe and efficient.

Technical scheme: in order to achieve the above object, the technical scheme adopted in the present invention is:

An integrated construction method for tree-root-type drainage and plugging of water-rich faults in roadways. First, the main borehole is constructed at the set position on the excavation contour line of the roadway, and then the tree-root type branch drill is constructed in the main borehole according to the design. holes to ensure that the final holes of the main borehole and tree-root branch boreholes fall within the fault; during the drainage construction stage, the main borehole and the tree-root branch drill holes connected stage, the main borehole and the tree-root branch boreholes connected to it are used as grouting holes.

Preferably, after the construction of the main borehole is completed, the orifice steel pipe is installed in the main borehole. The installation of the orifice steel pipe can protect the main borehole and prevent the main borehole from collapsing. Smooth construction.

Preferably, in the drainage construction stage, a flange is used to connect the orifice steel pipe and the drain pipe, and at the same time, a permeable plug is installed in the orifice steel pipe; groundwater flows into the drain pipe through the root-shaped branch borehole and the main borehole and is discharged, and the permeable plug Filter the groundwater flowing into the drain pipe to prevent the drain pipe from clogging.

Preferably, in the grouting construction stage, a controllable grouting device is used to connect the orifice steel pipe and the high-pressure grouting hose, and a check valve is installed in the high-pressure grouting hose; the grout pumped by the high-pressure grouting pump passes through the high-pressure The grouting hose is injected into the main borehole and the root-shaped branch borehole; the reverse flow of the grout is prevented by the check valve, and the waste of grout is avoided; the flow rate of the grout is controlled by the controllable grouter to ensure that the grout passes through the main borehole in a stable and uniform manner Inject into the root-shaped branch boreholes, so that the grouting water blocking curtain formed in the main borehole and the tree-root type branch holes can be intersected, so as to achieve the purpose of rapid water blocking and surrounding rock bearing.

Preferably, the grouting parameters are recorded by the grouting recorder, the grouting parameters include the pumping pressure of the grout, the flow rate of the grout and the grouting time, and the grouting recorder can reflect the flow of the grout and the dynamic changes of the grouting parameters in real time, It is convenient to adjust the grouting parameters in time to ensure the grouting effect.

Specifically, the integrated construction method for dredging and blocking water of the roadway through a water-rich fault tree root type includes the following steps:

Step 1: Place the directional geological drilling rig in the roadway, install the drill pipe on the directional geological drilling rig, start the directional geological drilling rig to drive the drill pipe to rotate at high speed, and construct the main hole according to the set position on the excavation contour line of the roadway; After the construction of the main borehole is completed, the orifice steel pipe is installed in the main borehole; the tree-rooted branch drilling is constructed in the main borehole according to the design to ensure that the final hole position of the main borehole and the tree-rooted branch borehole falls on the fault Inside;

Step 2: Install the permeable plug in the orifice steel pipe, use the flange to connect the orifice steel pipe and the drain pipe, and drain the groundwater entering the root-shaped branch borehole and the main borehole into the drainage ditch of the roadway floor through the drain pipe; The permeable plug can effectively prevent the gravel, sand, silt and other granular media in the fault from flowing into the drain pipe, avoiding the blockage of the drain pipe, so that the groundwater can flow into the drain pipe in a timely, smooth and efficient manner, and at the same time reduce or remove the leakage of groundwater. Pressure (hydrophobic pressure relief), which is conducive to subsequent grouting;

Step 3: After the completion of the drainage construction phase, remove the connection between the flange and the orifice steel pipe, and take out the permeable plug at the same time; use a controllable grouter to connect the orifice steel pipe and the high-pressure grouting hose, A check valve is installed in the pipe; the grout pumped by the high-pressure grouting pump is quickly and fully injected into the main borehole and the root-shaped branch borehole through the high-pressure grouting hose, the backflow of the grout is prevented through the check valve, and the grout is passed through the controllable grouting device. Control the flow rate of the grout to ensure that the grout spreads in the root-like space in the main borehole and the root-shaped branch borehole, forming a grouting water blocking curtain and a load-bearing reinforcement, which can prevent the grout from entering the main borehole and the root-shaped branch The problem of non-intersection of the grouting water blocking reinforcement ring formed after grouting due to uneven diffusion in the borehole can also prevent the amount of grout injected into the main borehole and tree-rooted branch boreholes due to too low grouting pressure Insufficient water blocking failure.

Preferably, in the grouting construction stage, the injected grout is cement or polyurethane grouting material.

Beneficial effects: The integrated construction method for dredging and blocking water by tree root type in roadways passing through water-rich faults provided by the present invention is suitable for underground projects such as coal mines, iron mines, non-ferrous metal mines, tunnels, subways, etc., and is a safe and efficient method for crossing water-rich faults. The construction method is simple, feasible, economical and applicable, one hole for multiple purposes, combined with dredging and plugging, safe and efficient, and provides a new method for roadways and tunnels to cross water-rich faults safely, efficiently and quickly.

Description of drawings

Fig. 1 is a schematic diagram of the location of the main borehole and the tree root type branch borehole;

Fig. 2 is the construction schematic diagram of main borehole and tree root type branch borehole;

Fig. 3 is the construction schematic diagram of hydrophobic stage;

Fig. 4 is the construction schematic diagram of grouting stage;

Including: 1-roadway, 2-excavation outline, 3-directional geological drilling rig, 4-drill pipe, 5-main drilling, 6-tree root branch drilling, 7-hole steel pipe, 8-permeable plug, 9-flange, 10-drain pipe, 11-fixed cable, 12-drainage ditch, 13-controllable grouting device, 14-return valve, 15-high pressure grouting pump, 16-grouting recorder , 17-high-pressure grouting hose, 18-fault.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

An integrated construction method for dredging and blocking water by tree root type in a roadway passing through a water-rich fault, comprising the following steps:

Step 1: Place the directional geological drilling machine 3 in the roadway 1, install the drill pipe 4 on the directional geological drilling machine 3, start the directional geological drilling machine 3 to drive the drilling pipe 4 to rotate at a high speed, and press the setting on the excavation contour line 2 of the roadway 1 Construct the main borehole 5 at a fixed position (about 120-150 mm in diameter); after the construction of the main borehole 5 is completed, install the orifice steel pipe 7 in the main borehole 5; construct the tree-rooted branch in the main borehole 5 according to the design Borehole 6 (with a diameter of about 60-80mm, divided into 6-10 branches, symmetrically distributed in the shape of tree roots, and spatially expanded along the fault direction), to ensure the final hole of main borehole 5 and tree-rooted branch borehole 6 The position falls within the fault 18; the positions of the main borehole 5 and the tree-root type branch borehole 6 after construction are as shown in Figure 1, and the construction process is as shown in Figure 2;

Step 2: As shown in Figure 3, in the hydrophobic stage, install the permeable plug 8 in the orifice steel pipe 7, use the flange 9 to connect the orifice steel pipe 7 and the drain pipe 10, and pass the drain pipe 10 to enter the tree root type branch drill The groundwater in the hole 6 and the main borehole 5 is drained into the drainage ditch 12 on the bottom plate of the roadway 1; blockage, so that groundwater can flow into the drain pipe 10 smoothly and efficiently, and at the same time reduce or remove the pressure of groundwater to drain and relieve pressure, which is beneficial to subsequent grouting;

Step 3: After the completion of the drainage construction stage, release the connection between the flange plate 9 and the orifice steel pipe 7, and take out the permeable plug 8 at the same time; steel pipe 7 and high-pressure grouting hose 17, and a check valve 14 is installed in the high-pressure grouting hose 17; Fully inject the main borehole 5 and the root-shaped branch borehole 6, prevent the backflow of the grout through the check valve 14, and control the flow of the grout through the controllable grouting device 13, so as to ensure that the grout flows through the main borehole 5 and the root-shaped branch drill hole. The hole 6 spreads in a tree-root shape to form a grouting water blocking curtain and a load-bearing reinforcement, which can avoid the uneven diffusion of the grout in the main borehole 5 and the tree-rooted branch borehole 6, resulting in the formation of grouting after grouting. The disjoint problem of the grouting water blocking reinforcement circle can also prevent the water blocking failure caused by the insufficient injection of grout in the main borehole 5 and the tree root branch borehole 6 due to too small grouting pressure; during the grouting process , record the grouting parameters through the grouting recorder 16, the grouting parameters include the pumping pressure of the grout, the flow rate of the grout and the grouting time, and monitor the flow of the grout and the dynamic changes of the grouting parameters in real time, so as to adjust the grouting parameters in time And guarantee the grouting effect.

In the process of draining pressure relief and grouting construction, the boreholes (main borehole and tree root branch borehole) used in grouting are the same as the boreholes used in draining, so that one hole can be used for multiple purposes (recycling) ) and avoid repeated hole making, thereby reducing the number of drilling holes and saving the cost of the project; at the same time, the organic combination of roadway drainage and pressure relief and grouting water plugging (combination of dredging and plugging) has been realized, forming an integrated comprehensive roadway dredging and plugging Water control technology has improved the effect of mine water control.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protection scope of the present invention.

Claims (7)

1. a kind of tunnel crosses rich water tomography tree root type and dredges water blockoff integral construction method, it is characterised in that：First in tunnel (1) By setting position construction main borehole (5) on excavation contour line (2), then by design and construction tree root type branch in main borehole (5) It drills (6), ensures that the borehole bottom location of main borehole (5) and tree root type branch hole (6) is fallen in tomography (18)；In hydrophobic construction rank Section regard main borehole (5) and tree root type branch hole (6) in communication as weep hole；In the mortar depositing construction stage, by main borehole (5) and tree root type branch hole (6) in communication is used as injected hole.

2. tunnel according to claim 1 crosses rich water tomography tree root type and dredges water blockoff integral construction method, it is characterised in that： After the completion of main borehole (5) construct, in main borehole (5) interior installing hole mouth steel pipe (7).

3. tunnel according to claim 2 crosses rich water tomography tree root type and dredges water blockoff integral construction method, it is characterised in that： In the hydrophobic construction stage, using ring flange (9) connection aperture steel pipe (7) and drain pipe (10), while the peace in aperture steel pipe (7) Fill permeable plug (8).

4. tunnel according to claim 2 crosses rich water tomography tree root type and dredges water blockoff integral construction method, it is characterised in that： In the mortar depositing construction stage, using controllable type slurry casting machine (13) connection aperture steel pipe (7) and high-pressure slip-casting hose (17), while in height Installation non-return valve (14) in pressure grouting hose (17)；The slurries that high-pressure injection pump (15) pumps out are noted by high-pressure slip-casting hose (17) Enter main borehole (5) and tree root type branch hole (6), slurries adverse current is prevented by non-return valve (14), passes through controllable type slurry casting machine (13) flow of slurries is controlled.

5. tunnel according to claim 4 crosses rich water tomography tree root type and dredges water blockoff integral construction method, it is characterised in that： Grouting parameter is recorded by slip casting recorder (16), grouting parameter includes slurries when pumping out pressure, the flow of slurries and slip casting Between.

6. tunnel according to claim 1 crosses rich water tomography tree root type and dredges water blockoff integral construction method, it is characterised in that： Include the following steps：

Step 1：Orientation geological drilling rig (3) is placed in tunnel (1), drilling rod (4) is mounted on orientation geological drilling rig (3), Start orientation geological drilling rig (3) and drive drilling rod (4) high speed rotation, is applied by setting position on the excavation contour line (2) of tunnel (1) Work main borehole (5)；After the completion of waiting for main borehole (5) construction, in main borehole (5) interior installing hole mouth steel pipe (7)；In main borehole (5) By design and construction tree root type branch hole (6), ensure that the borehole bottom location of main borehole (5) and tree root type branch hole (6) is fallen disconnected In layer (18)；

Step 2：In aperture, the permeable plug (8) of installation in steel pipe (7), uses ring flange (9) connection aperture steel pipe (7) and drain pipe (10), the underground water for entering tree root type branch hole (6) and main borehole (5) is discharged to by tunnel (1) bottom plate by drain pipe (10) Gutter (12) in；

Step 3：After the completion of the hydrophobic construction stage, the connection of ring flange (9) and aperture steel pipe (7) is released, while being taken out permeable It fills in (8)；It is connected to aperture steel pipe (7) and high-pressure slip-casting hose (17) using controllable type slurry casting machine (13), while soft in high-pressure slip-casting Manage installation non-return valve (14) in (17)；The slurries that high-pressure injection pump (15) pumps out inject main borehole by high-pressure slip-casting hose (17) (5) and tree root type branch hole (6) slurries adverse current, is prevented by non-return valve (14), passes through controllable type slurry casting machine (13) control slurry The flow of liquid ensures that slurries are spread in main borehole (5) and tree root type branch hole (6) in tree root shape space, it is stifled to form slip casting Water curtain and carrying reinforcing body.

7. tunnel according to claim 1 crosses rich water tomography tree root type and dredges water blockoff integral construction method, it is characterised in that： Mortar depositing construction stage, injection slurries are cement class or polyurethane sludge injection material.