阅读说明：本技术 一种煤矿井下综采工作面开采方法 (Mining method for underground coal mine fully mechanized coal mining face ) 是由 张海龙 魏启明 赵华 王学龙 王虎 常富贵 赵俊杰 于 2021-09-08 设计创作，主要内容包括：本申请公开了一种煤矿井下综采工作面开采方法,包括以下步骤：在布置第N个区段工作面时,施工所述第N个区段工作面的运输顺槽和切眼,同时施工相邻的第N+1个区段工作面的运输顺槽,N≥1；将所述第N个区段工作面的积水引流至所述第N+1个区段工作面的运输顺槽并排出；完成所述第N个区段工作面的回采后,施工所述第N+1个区段工作面的回风顺槽,同时施工第N+2个区段工作面的运输顺槽,并将所述第N+1个区段工作面的积水引流至第N+2个区段工作面的运输顺槽并排出。本方法既不会影响排水工作,也无需对下一个区段工作面的回风顺槽进行维护。(The application discloses a mining method of a fully mechanized mining face under a coal mine well, which comprises the following steps: when the working surface of the Nth section is arranged, constructing a transportation crossheading and a cutting hole of the working surface of the Nth section, and constructing a transportation crossheading of the working surface of the adjacent (N + 1) th section at the same time, wherein N is more than or equal to 1; draining the accumulated water on the working surface of the Nth section to a transport gate way of the working surface of the (N + 1) th section and discharging; and (4) completing the recovery of the Nth section working surface, constructing the return air crossheading of the (N + 1) th section working surface, constructing the transportation crossheading of the (N + 2) th section working surface simultaneously, and draining the accumulated water of the (N + 1) th section working surface to the transportation crossheading of the (N + 2) th section working surface and discharging. The method does not influence the drainage work, and does not need to maintain the return air crossheading of the working surface of the next section.)

1. A mining method of a fully mechanized coal mining face under a coal mine well is characterized by comprising the following steps:

when the working surface of the Nth section is arranged, constructing a transportation crossheading (1) and a cutting hole (3) of the working surface of the Nth section, and constructing a transportation crossheading (1) of the working surface of the (N + 1) th adjacent section at the same time, wherein N is more than or equal to 1;

draining the accumulated water on the working surface of the Nth section to a transport gate way (1) on the working surface of the (N + 1) th section and discharging;

and (3) completing the recovery of the Nth section working surface, constructing the return air crossheading (2) of the (N + 1) th section working surface, constructing the transportation crossheading (1) of the (N + 2) th section working surface simultaneously, and draining the accumulated water of the (N + 1) th section working surface to the transportation crossheading (1) of the (N + 2) th section working surface and discharging.

2. The mining method for the underground coal mine fully mechanized mining face according to claim 1, characterized in that when arranging the nth block face, the method further comprises simultaneously constructing the cutting holes (3) of the adjacent (N + 1) th block face.

3. The method for mining the fully mechanized coal mining face in the underground coal mine according to claim 2, wherein draining the accumulated water of the nth zone face to the transportation gate way (1) of the (N + 1) th zone face and discharging the accumulated water comprises:

drilling a drainage hole (10) which is communicated with a waterlogging area (4) of the Nth section working face and a cutting hole (3) of the (N + 1) th section working face from a transportation gate (1) of the Nth section working face;

a working surface water sump (5) is arranged at the lowest end of the transportation gate way (1) of the (N + 1) th section working surface;

the accumulated water of the working surface of the Nth section is drained to the transportation gate way (1) of the working surface of the (N + 1) th section along the cutting hole (3) of the working surface of the (N + 1) th section, and is drained to the working surface water bin (5) of the working surface of the (N + 1) th section from the transportation gate way (1) of the working surface of the (N + 1) th section;

and discharging accumulated water in the working surface water sump (5) of the (N + 1) th section working surface outwards.

4. The mining method of the coal mine underground fully mechanized mining face according to claim 1, characterized in that when the nth section face is a first section face, a transport gateway (1), a return air gateway (2) and a cutting hole (3) of the first section face are constructed simultaneously when the first section face is arranged.

5. The mining method of the coal mine underground fully mechanized coal mining face according to claim 1, characterized in that when the (N + 2) th section face is the last face, after the recovery of the (N + 1) th section face is completed, a return air gateway (2) of the (N + 2) th section face is constructed, and a drainage roadway is constructed below a transport gateway (1) of the (N + 2) th section face to drain accumulated water of the (N + 2) th section face.

6. The mining method of the fully mechanized mining face in the underground coal mine according to claim 3, wherein a water inlet of the water drainage hole (10) is communicated with the face water sump (5), and a valve mechanism (13) is arranged at a water outlet of the water drainage hole (10).

7. The mining method for the underground coal mine fully mechanized mining face according to claim 6, wherein the valve mechanism (13) comprises a main pipe (131), and a first branch pipe (132) communicated with the main pipe (131);

a ball valve (134) and a pressure gauge (135) are arranged in the main pipeline (131);

a flowmeter (136) and a filter plate (137) are arranged in the first branch pipeline (132), a water outlet of the first branch pipeline (132) is communicated with a water guide pipe, and the water guide pipe is arranged along the cutting hole (3) of the working surface of the second section and is communicated to a working surface water bin (5) of the working surface of the second section;

the valve mechanism (13) further comprises a second branch pipeline (133) communicated with the main pipeline (131), and a butterfly valve (138) is arranged at a water outlet of the second branch pipeline (133).

8. The mining method for the coal mine underground fully mechanized mining face according to claim 6, wherein the hydrophobic hole (10) comprises a first drilling hole (101) and a second drilling hole (102) which are communicated with each other, and the aperture of the first drilling hole (101) is larger than that of the second drilling hole (102);

the first drill hole (101) is communicated with a water outlet of the drain hole (10), the second drill hole (102) is communicated with a water inlet of the drain hole (10), and a water stop sleeve (11) is installed in the first drill hole (101).

9. The mining method for the fully mechanized mining face in the coal mine well according to claim 8, wherein the method for drilling the hydrophobic hole (10) comprises the following steps:

drilling the first borehole (101) and then installing the water stop sleeve (11) in the first borehole (101);

grouting between the outer wall of the water stop sleeve (11) and the inner wall of the first bore (101);

drilling the second borehole (102) through the water stop sleeve (11).

10. The mining method for the fully mechanized mining face in the coal mine well according to claim 4, wherein before the first section face is arranged, a rock roadway of an exploitation area and the bottom-hole sump are exploited, and a middle yard (6) corresponding to each section face is constructed at the same time.

Technical Field

The application relates to the technical field of coal mining, in particular to a mining method of a fully mechanized coal mining face in a coal mine.

Background

The development mode of the underground coal mine usually adopts a double-wing central parallel type, and the layout is characterized in that a large roadway is developed in the center of a well field, two wings of the well field are cut along the tunneling direction, and the well field is replaced by mining from top to bottom. The return air crossheading of the working surface of the next section is adjacent to the transportation crossheading of the working surface of the previous section, and due to the action of the stope pressure, the selection of the coal pillar width setting and the crossheading tunneling time is related to the deformation and maintenance problems of the return air crossheading roadway of the second working surface.

In the prior art, a transport gateway of a working face of a previous section and a return air gateway of a working face of a next section are always tunneled simultaneously, and double tunnels are arranged simultaneously. The defects of the arrangement are that the return air crossheading of the working face of the next section is pressed to deform the top plate to sink and the bottom plate to bulge seriously due to the influence of mine pressure on the working face of the mining, so that the roadway cannot be normally used, and the maintenance difficulty is high. Meanwhile, the return air crossheading of the working surface of the next section is responsible for the drainage task of the goaf and is influenced by the stoping of the working surface of the previous section, and the return air crossheading of the working surface of the next section is required to continuously bear the influence of pressure release, so that the return air crossheading needs to be maintained when the stoping of the working surface of the next section is carried out, the maintenance cost is high, and the maintenance difficulty is high.

Therefore, a coal mine underground fully mechanized mining face mining method which does not affect drainage work and does not need to maintain a return air gateway of a next section of working face needs to be designed.

Disclosure of Invention

The utility model provides a not enough of prior art is overcome to aim at of this application, provides a colliery is combined in pit and is adopted working face exploitation method, carries out the drainage through the transportation cistron that adopts next working face, can protect the return air cistron and need not to maintain the return air cistron.

The technical scheme of the application provides a mining method of a coal mine underground fully mechanized coal mining face, which comprises the following steps:

when the working surface of the Nth section is arranged, constructing a transportation crossheading and a cutting hole of the working surface of the Nth section, and constructing a transportation crossheading of the working surface of the adjacent (N + 1) th section at the same time, wherein N is more than or equal to 1;

draining the accumulated water on the working surface of the Nth section to a transport gate way of the working surface of the (N + 1) th section and discharging;

and (3) after the recovery of the Nth section working surface is completed, constructing the return air crossheading of the (N + 1) th section working surface, constructing the transportation crossheading of the (N + 2) th section working surface simultaneously, and draining the accumulated water of the (N + 1) th section working surface to the transportation crossheading of the (N + 2) th section working surface and discharging the accumulated water.

Preferably, when the nth section working face is arranged, the method further comprises the step of simultaneously constructing the cutting holes of the adjacent (N + 1) th section working face.

Preferably, draining the accumulated water of the nth section working surface to the transport gate of the (N + 1) th section working surface and discharging the water comprises:

drilling a drainage hole which is communicated with a ponding area of the Nth section working face and a cutting hole of the (N + 1) th section working face from the transportation gate of the Nth section working face;

a working surface water sump is arranged at the lowest end of the transportation gate of the (N + 1) th section working surface;

the accumulated water of the working surface of the Nth section is drained to the transportation gate way of the working surface of the (N + 1) th section along the cutting hole of the working surface of the (N + 1) th section, and is drained to the working surface water sump of the working surface of the (N + 1) th section from the transportation gate way of the working surface of the (N + 1) th section;

and discharging accumulated water in the working surface water sump of the (N + 1) th section working surface outwards.

Preferably, when the nth section working face is a leading section working face, the transport gate, the return air gate and the cutting hole of the leading section working face are simultaneously constructed when the leading section working face is arranged.

Preferably, when the (N + 2) th section working surface is the last working surface, after the recovery of the (N + 1) th section working surface is completed, the return air crossheading of the (N + 2) th section working surface is constructed, and meanwhile, a drainage roadway is constructed below the transportation crossheading of the (N + 2) th section working surface to drain accumulated water on the (N + 2) th section working surface.

Preferably, the step of discharging accumulated water in the working surface sump of the (N + 1) th section working surface outwards specifically comprises:

a water pump is arranged in the working surface water sump, and accumulated water in the working surface water sump is pumped out to a well bottom water sump through the water pump;

the water pump is arranged in the shaft bottom water sump, and accumulated water in the shaft bottom water sump is pumped out of the ground through the water pump and is discharged.

Preferably, the water inlet of the drainage hole is communicated with the working surface water bin, and the water outlet of the drainage hole is provided with a valve mechanism.

Preferably, the valve mechanism comprises a main pipe and a first branch pipe communicated with the main pipe;

a ball valve and a pressure gauge are arranged in the main pipeline;

the first branch pipeline is internally provided with a flowmeter and a filter plate, a water outlet of the first branch pipeline is communicated with a water guide pipe, and the water guide pipe is arranged along the cutting hole of the (N + 1) th section working surface and communicated to the working surface water sump of the (N + 1) th section working surface.

Preferably, the valve mechanism further comprises a second branch pipeline communicated with the main pipeline, and a butterfly valve is arranged at a water outlet of the second branch pipeline.

Preferably, the hydrophobic hole comprises a first drilling hole and a second drilling hole which are communicated with each other, and the aperture of the first drilling hole is larger than that of the second drilling hole;

the first drilling hole is communicated with the water outlet of the hydrophobic hole, the second drilling hole is communicated with the water inlet of the hydrophobic hole, and a water stop sleeve is installed in the first drilling hole.

Preferably, the method for drilling the hydrophobic hole is as follows:

firstly drilling the first drill hole, and then installing the water stop sleeve in the first drill hole;

grouting between the outer wall of the water stop sleeve and the inner wall of the first drill hole;

drilling the second borehole through the water stop sleeve.

Preferably, before the first section working face is arranged, a mining area rock roadway and the bottom-hole sump are exploited, and a middle parking lot corresponding to each section working face is constructed at the same time.

After adopting above-mentioned technical scheme, have following beneficial effect:

this application is to the transportation cistron of the next district section working face of construction simultaneously when carrying out the arrangement of last district section working face to carry out the drainage to last district section working face through the transportation cistron of next district section working face, the return air cistron of next district section working face need not to dig in advance and undertake drainage function like this, can avoid the damage of return air cistron and need not to maintain the return air cistron, improves the operating efficiency.

Drawings

The disclosure of the present application will become more readily understood by reference to the drawings. It should be understood that: these drawings are for illustrative purposes only and are not intended to limit the scope of the present application. In the figure:

FIG. 1 is a flow chart of a method for mining a fully mechanized coal mining face in an underground coal mine according to one embodiment of the present disclosure;

FIG. 2 is a schematic illustration of a two segment work surface in one embodiment of the present invention;

FIG. 3 is a schematic view of a valve mechanism according to one embodiment of the present invention;

FIG. 4 is a schematic view of a hydrophobic pore in one embodiment of the present invention;

FIG. 5 is a schematic illustration of the present invention during a first borehole slip casting in one embodiment.

Reference symbol comparison table:

the system comprises a transportation crossheading 1, a return air crossheading 2, a cutting hole 3, a water accumulation area 4, a working surface sump 5, a middle yard 6, an auxiliary transportation uphill roadway 7, a transportation uphill roadway 8 and a return air uphill roadway 9;

hydrophobic pores 10: a first drilling 101, a second drilling 102 and a second grouting flow channel 103;

the water stop sleeve 11: a serrated grout outlet 111 and a first grouting flow channel 112;

a grouting machine 12;

the valve mechanism 13: a main pipe 131, a first branch pipe 132, a second branch pipe 133, a ball valve 134, a pressure gauge 135, a flow meter 136, a filter plate 137 and a butterfly valve 138.

Detailed Description

Embodiments of the present application are further described below with reference to the accompanying drawings.

It is easily understood that according to the technical solutions of the present application, those skilled in the art can substitute various structures and implementations without changing the spirit of the present application. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical solutions of the present application, and should not be construed as limiting or restricting the technical solutions of the present application in their entirety.

The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Throughout the description of the present application, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "coupled" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The foregoing is to be understood as belonging to the specific meanings in the present application as appropriate to the person of ordinary skill in the art.

In one embodiment of the present invention, a method for mining a fully mechanized coal mining face in a coal mine is disclosed, as shown in fig. 1 and 2, the method includes the following steps:

s1: when the working surface of the Nth section is arranged, constructing a transportation crossheading and a cutting hole of the working surface of the Nth section, and constructing a transportation crossheading 1 of the working surface of the adjacent (N + 1) th section at the same time, wherein N is more than or equal to 1;

s2: draining the accumulated water on the working surface of the Nth section to the transport gate 1 on the working surface of the (N + 1) th section and discharging the accumulated water;

s3: and after the recovery of the working surface of the Nth section is finished, constructing a return air gateway 2 of the working surface of the (N + 1) th section, constructing a transportation gateway 1 of the working surface of the (N + 2) th section, draining the accumulated water of the working surface of the (N + 1) th section to the transportation gateway 1 of the working surface of the (N + 2) th section, and discharging.

When the working face of the previous section is arranged, a transport gateway 1 and a cutting hole 3 of the working face of the previous section are dug, and meanwhile, a transport gateway of the working face of the next section is dug, the return air gateway 2 of the working face of the next section is not constructed, when the recovery of the working face of the previous section is finished, a water accumulation area 4 is formed in the working face of the previous section and accumulates water, the accumulated water in the water accumulation area 4 of the working face of the previous section is drained to the transport gateway 1 of the working face of the next section and is discharged, and after the drainage is finished, the return air gateway 2 of the working face of the next section is constructed and the working face is recovered. When the method is used for draining water on the working surface of the previous section, the return air gateway 2 of the working surface of the next section does not need to be dug, accumulated water in the water area 4 of the working area of the previous section is drained through the transportation gateway 1 of the working surface of the next section, and therefore the return air gateway 2 does not need to bear the drainage function, the return air gateway 2 is prevented from bearing the pressure release of the recovery and bearing the drainage task at the same time, the return air gateway 2 is prevented from being pressed to deform the top plate to sink, and the use of the return air gateway 2 is further influenced. By the method, the return air crossheading 2 can be normally used without maintenance on the premise of not influencing normal drainage work, and the working efficiency is improved. In some embodiments of the present invention, when arranging the nth segment work surface, the method further comprises simultaneously constructing the incisions 3 of the adjacent (N + 1) th segment work surface.

Ponding in 4 of the ponding district of the N district section working face is through the transport crossheading 1 of the eye of cutting 3 drainage to the N +1 district section working face of the N +1 district section working face to from the transport crossheading 1 discharge of the N +1 district section working face, can enough accelerate the construction progress of the N +1 district section working face like this, also need not to dig drainage tunnel intercommunication transport crossheading 1 in addition, improve the operating efficiency.

Optionally, a channel can be dug in the (N + 1) th section working face to communicate with the ponding region 4 of the nth section working face, so that the ponding water in the ponding region 4 of the nth section working face can be drained into the transport gateway 1 of the (N + 1) th section working face and discharged. In some embodiments of the present invention, when the nth section working face is the first section working face, the transport gateway 1, the return air gateway 2, and the cutout 3 of the first section working face are simultaneously constructed in arranging the first section working face.

In some embodiments of the present invention, when the (N + 2) th section working surface is the last working surface, that is, there is no (N + 3) th section working surface, after the recovery of the (N + 1) th section working surface is completed, the return air gateway 2 of the (N + 2) th section working surface is constructed, and simultaneously a drainage roadway is constructed on the coal pillar below the transportation gateway 1 of the (N + 2) th section working surface for draining the accumulated water of the (N + 2) th section working surface.

And N is more than or equal to 1, and when the working faces of more than 4 sections exist, the steps S1-S3 are repeated before the working face of the last section is mined until the drainage is carried out after the working face of the last section is mined and the coal pillar construction drainage roadway below the transportation gateway 1 of the working face of the last section is used for drainage.

In some embodiments of the invention, diverting accumulated water of the nth section work surface to the transport gate 1 of the (N + 1) th section work surface and out of the body comprises:

as shown in fig. 2, drilling a drainage hole 10 communicating the ponding area 4 of the working surface of the nth section and the cutting hole 3 of the working surface of the (N + 1) th section from the transportation gate 1 of the working surface of the nth section;

a working surface water sump 5 is arranged at the lowest end of the transportation crossheading 1 of the (N + 1) th section working surface;

the accumulated water of the working surface of the Nth section is drained to the transport crossheading 1 of the working surface of the (N + 1) th section along the cutting hole 3 of the working surface of the (N + 1) th section, and is drained to the working surface water sump 5 of the working surface of the (N + 1) th section from the transport crossheading 1 of the working surface of the (N + 1) th section;

and discharging accumulated water in the working surface water sump 5 of the (N + 1) th section working surface outwards.

Specifically, a drilling field is arranged at the end position of the cutting hole 3 of the (N + 1) th section working surface, a drilling machine is used for drilling a drain hole 10 in the drilling field, the drain hole 10 is communicated through a pipeline, and accumulated water in the water accumulation area 4 of the Nth section working surface is drained to the working surface water bin 5 of the (N + 1) th section working surface through the cutting hole 3 of the (N + 1) th section working surface and the transportation gate way 1.

In some embodiments of the present invention, the discharging the accumulated water in the working surface sump 5 of the (N + 1) th section working surface to the outside specifically includes:

a water pump is arranged in the working surface water sump 5, and accumulated water in the working surface water sump 5 is pumped out to a water sump (not shown) of a mining area through the water pump;

and a water pump is arranged in the water sump of the mining area, accumulated water in the water sump of the mining area is pumped to the central water sump of the shaft bottom through the water pump, and then the accumulated water in the central water sump of the shaft bottom is pumped to the ground for discharging.

In some embodiments of the present invention, the water inlet of the water drainage hole 10 is communicated with the working surface water sump 5, and the water outlet of the water drainage hole 10 is provided with a valve mechanism 13. The amount of water to be discharged can be controlled by the valve mechanism 13.

In some embodiments of the present invention, as shown in fig. 3, the valve mechanism 13 includes a main pipe 131, a first branch pipe 132 communicating with the main pipe 131;

a ball valve 134 and a pressure gauge 135 are arranged in the main pipeline 131;

the first branch pipe 132 is provided with a flowmeter 136 and a filter plate 137, the water outlet of the first branch pipe 132 is communicated with a water conduit, and the water conduit is arranged along the cutting hole 3 of the (N + 1) th section working surface and is communicated to the working surface water bin 5 of the (N + 1) th section working surface.

Wherein, the delivery port of the one end intercommunication trap 10 of trunk line 131, the first minute pipeline 132 of other end intercommunication, manometer 135 through in trunk line 131 can monitor the pressure of drainage, can monitor drainage flow through flowmeter 136 in the first minute pipeline 132 simultaneously, and the staff adjusts ball valve 134 and then adjusts the flow of drainage according to actual demand. Meanwhile, the filter plate 137 provided in the first branch duct 132 can be used to separate impurities in the accumulated water to prevent the draft tube from being clogged.

In some embodiments of the present invention, as shown in fig. 3, the valve mechanism 13 further comprises a second branch pipe 133 communicated with the main pipe 131, and a water outlet of the second branch pipe 133 is provided with a butterfly valve 138. Impurity in the valve mechanism 13 can be removed and a protective effect can be achieved through the second branch pipe 133, and when the drainage pressure is too large, a worker can open the butterfly valve 138 to enable accumulated water to be discharged from the second branch pipe 133 to reduce the pressure of the valve mechanism 13. When the amount of impurities accumulated in the valve mechanism 13 is too large to affect the flow rate of the discharged water, the impurities can be discharged to the outside by opening the butterfly valve 138, so that the valve mechanism 13 is prevented from being clogged.

In some embodiments of the present invention, as shown in fig. 4, the hydrophobic hole 10 includes a first bore 101 and a second bore 102 communicating with each other, the first bore 101 having a larger bore diameter than the second bore 102;

the first drilling 101 is communicated with the water outlet of the water drainage hole 10, the second drilling 102 is communicated with the water inlet of the water drainage hole 10, and the first drilling 101 is internally provided with a water stop sleeve 11.

Specifically, when the drain hole 10 is drilled, the hole is opened by the diameter D1 to the length of the water stop casing 11, drilling is stopped, then reaming is performed by the diameter D2 to complete drilling of the first drill hole 101, the water stop casing 11 with the diameter D3 is installed in the first drill hole 101, and after installation of the water stop casing 11 is completed, the second drill hole 102 is drilled by the diameter D1 through the water stop casing 11. Wherein D2> D3> D1. The hole wall of the drain hole 10 can be reinforced by the water stop sleeve 11, and hole collapse is avoided.

In some embodiments of the invention, the method of drilling the hydrophobic hole 10 is:

firstly drilling a first drill hole 101, and then installing a water stop sleeve 11 in the first drill hole 101;

grouting between the outer wall of the water stop sleeve 11 and the inner wall of the first drill hole 101;

a second borehole 102 is drilled through the water stop sleeve 11.

Further, as shown in fig. 5, a serrated grout outlet 111 is provided at an end of the water stop sleeve, when the water stop sleeve is installed in the first bore 101, the serrated grout outlet 111 at the end of the water stop sleeve is attached to an end of the first bore 101, a first grouting flow channel 112 is formed in an inner cavity of the water stop sleeve, a second grouting flow channel 103 is formed between an outer wall of the water stop sleeve and an inner wall of the first bore 101, the first grouting flow channel 112 and the second grouting flow channel 103 are communicated through the serrated grout outlet 111, a grouting machine 12 is used to communicate one end of the water stop sleeve, which is far away from the serrated grout outlet 111, with grout injected into the first grouting flow channel 112, the grout flows out from the serrated grout outlet 111 to the second grouting flow channel 103 through the first grouting flow channel 112, and finally, after the grout is solidified, the fixation of the water stop sleeve and the first bore 101 can be completed.

Specifically, the water-cement ratio of the slurry was 0.75: 1, 5% of water glass (42Be) is added, and the hole can Be cleaned after 24 hours of solidification under the normal temperature condition.

And (3) after cement paste around the orifice pipe is solidified, sweeping the hole, wherein the sweeping depth is 0.5m greater than the length of the orifice pipe, then carrying out a pressure test, wherein the test pressure is 1.5MPa, the stabilization time is not less than half an hour, the periphery of the orifice is not water-tight, the water-stopping sleeve 11 is firm and inactive, and the second borehole 102 can be drilled after the water-stopping sleeve is firmly bound with a surrounding anchor rod by using a No. 8 lead wire.

Furthermore, in order to ensure the safety performance of the water stopping sleeve, the water stopping sleeve is a seamless steel pipe.

In some embodiments of the invention, as shown in fig. 2, prior to the deployment of the first block face, the development of the district roadway and the bottom hole sump are first performed while the intermediate yard 6 corresponding to each block face is constructed.

Further, as shown in fig. 2, the mining area rock roadway includes an auxiliary transport uphill roadway 7, a transport uphill roadway 8 and a return air uphill roadway 9, and the transport gateway 1 of the adjacent next section working face can be constructed simultaneously when the previous section working face is arranged by advancing the in-process yard 6 at the position corresponding to each section working face.

The method is illustrated with a construction 220603 work surface and a 220605 work surface:

as shown in fig. 2, the working face 220603 is adjacent to the working face 220605, wherein, when the working face 220603 is arranged, the transport crossroads 1 of the working face 220603 and the transport crossroads 1 of the working face 220605 are constructed at the same time, the cutting holes 3 of the working face 220603 and the cutting holes 3 of the working face 220605 are constructed at the same time, and the return air crossroads 2 of the working face 220605 are not constructed at the same time. The method comprises the steps of forming a water accumulation area 4 after recovery on an 220603 working face, communicating the water accumulation area 4 through drilling a drain hole 10, laying a water guide pipe communicated with the drain hole 10 in a transport crossheading 1 of a cut-out 3 and a 220605 working face of a 220605 working face, guiding accumulated water to a working face sump 5 arranged at the head of the transport crossheading 1 of a 220605 working face to the lower opening of the cut-out 3, installing a water pump in the working face sump 5, and pumping the accumulated water in the working face sump 5 to a mining area sump and a shaft bottom central sump and then discharging the pumped water to the ground. After the recovery of the 220603 working face is stable, the coal pillar between the 220603 working face and the 220605 working face and the return air crossheading 2 of the 220605 working face are constructed, the transportation crossheading 1 of the working face of the next section, namely the transportation crossheading 1 of the 220607 working face, is constructed at the same time, and the operation is repeated until the recovery reaches the working face of the last section, the auxiliary transportation crossheading is constructed on one side of the coal pillar for drainage.

The middle yard 6 is constructed in advance at the corresponding positions of the 220603 working face and the 220605 working face while the mining area rock roadway is exploited, so that the transportation gateway of the 220603 working face and the transportation gateway 1 of the 220605 working face can be constructed simultaneously.

According to the method, the working face of the previous section can be drained through the transportation gateway 1 of the working face of the next section, so that the return air gateway 2 of the working face of the next section does not need to be dug in advance and undertake the drainage function, the damage of the return air gateway 2 can be avoided, the return air gateway 2 does not need to be maintained, and the operation efficiency is improved.

What has been described above is merely the principles and preferred embodiments of the present application. It should be noted that, for a person skilled in the art, several other modifications can be made on the basis of the principle of the present application, and these should also be considered as the scope of protection of the present application.