Negative-pressure water pumping method for water-containing soft rock

Abstract

The invention relates to the technical field of coal mining, and provides a water-containing soft rock negative pressure water pumping method. The water-containing soft rock negative pressure water pumping method comprises the steps that the construction range, needing to guide fissure water, of a water pumping roadway is determined; a water inlet hole is formed in the water pumping pipe, plugging pieces are arranged on the head portion and the tail portion of a plugging section of the water pumping pipe respectively, and a grouting pipe is arranged in the plugging piece located on the head portion of the plugging section. And drilling holes are formed in the side wall of the water pumping roadway within the construction range. A drill hole is formed in the side wall of a water pumping roadway within a construction range, a water pumping pipe is inserted into the drill hole, and grouting which is fast in initial setting and free of bleeding is injected into an annular space between two plugging pieces through a grouting pipe for plugging; and the water pumping equipment is used for actively pumping water through the water pumping pipe, so that the pumping and drainage efficiency of the fissure water in the area is greatly improved, the pumping and drainage period of the fissure water is shortened, the influence of the fissure water on the surrounding rock strength is reduced, the roadway support quality is improved to a certain extent, and the surrounding rock stability is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mining, and in particular to a method for negative pressure pumping of water-containing soft rock. Background Art

[0002] For water-containing soft rock roadways, especially in the geological environment of water-rich mudstone, under the action of fissure water and the like, the strength of the surrounding rock of the roadway drops sharply, leading to a decrease in the active support anchoring force of the roadway, and even the failure of the support, resulting in an increase in roadway deformation, greatly affecting the rapid excavation and support of the roadway, and even the safe and efficient production of the mine.

[0003] Generally, mines usually passively guide the fissure water in the surrounding rock by constructing water collection holes or water collection containers. The implementation period is relatively long, and the effect of fissure water guidance cannot meet the production requirements, greatly affecting the roadway support form, especially the selection of the active support method, so that the mine is forced to adopt a more costly strong passive support. Summary of the Invention

[0004] The present invention provides a method for negative pressure pumping of water-containing soft rock to solve the problems of long construction period and low efficiency of fissure water guidance existing in the prior art.

[0005] The present invention provides a method for negative pressure pumping of water-containing soft rock, including: Determine the construction range where the fissure water needs to be guided in the pumping roadway; Set water inlet holes on the water extraction pipe, and respectively set sealing members at the head and tail of the sealing section of the water extraction pipe. A grouting pipe is arranged in the sealing member located at the head of the sealing section; Set drill holes on the side wall of the pumping roadway within the construction range; Insert the water extraction pipe into the drill hole, and inject a grouting volume with fast initial setting and no bleeding into the annular space between the two sealing members through the grouting pipe for sealing; Use a water extraction device to pump water through the water extraction pipe.

[0006] According to the method for negative pressure pumping of water-containing soft rock provided by the present invention, before performing the step of setting water inlet holes on the water extraction pipe and respectively setting sealing members at the head and tail of the sealing section of the water extraction pipe, it further includes: Perform shotcrete closing pretreatment on the surface of the pumping roadway within the construction range.

[0007] According to the method for negative pressure pumping of water-containing soft rock provided by the present invention, the thickness of the shotcrete on the surface of the pumping roadway is greater than or equal to 50 mm.

[0008] A method for negative pressure pumping of water-containing soft rock according to the present invention, the steps of setting water inlet holes on the water extraction pipe and respectively arranging plugging members at the head and tail of the plugged section of the water extraction pipe include: Mark the range of the water inlet holes, the positions of the water inlet holes, and the range of the plugged section on the water extraction pipe; Drill multiple groups of the water inlet holes on the water extraction pipe according to the marked positions of the water inlet holes, wherein each group includes two water inlet holes, and the two water inlet holes in the same group are arranged oppositely; Arrange the grouting pipe along the length direction of the water extraction pipe at the head of the plugged section; Wrap the plugging members with a predetermined length at the head and tail of the plugged section respectively, wherein the plugging member located at the head of the plugged section wraps the grouting pipe around the outer peripheral surface of the grouting pipe.

[0009] A method for negative pressure pumping of water-containing soft rock according to the present invention, the predetermined length is 180 - 220 mm, and the material of the plugging member is a mixture of cotton yarn and polyurethane.

[0010] A method for negative pressure pumping of water-containing soft rock according to the present invention, the distance between the two plugging members is 2560 - 2640 mm.

[0011] A method for negative pressure pumping of water-containing soft rock according to the present invention, the diameter of the grouting pipe is 20 mm, and the length of the grouting pipe is 1000 mm.

[0012] A method for negative pressure pumping of water-containing soft rock according to the present invention, the steps of setting drill holes on the side wall of the water extraction roadway within the construction range include: Mark the drill hole positions on the side wall of the water extraction roadway within the construction range; Drill holes at the drill hole positions through a rib anchor drill; After drilling, perform dry hole cleaning on the drill holes.

[0013] A method for negative pressure pumping of water-containing soft rock according to the present invention, the diameter of the drill hole is 42 mm, and the length of the drill hole is 10000 mm.

[0014] A method for negative pressure pumping of water-containing soft rock according to the present invention, two groups of the drill holes are set on each side wall, the two groups of drill holes are arranged at intervals in the up and down direction, multiple drill holes in the same group are arranged at intervals along the length direction of the water extraction roadway, and the distance between the orifice of the lower drill hole and the bottom plate of the water extraction roadway is 1000 mm.

[0015] The method for negative-pressure pumping of water-containing soft rock provided by the present invention involves setting drill holes on the side walls of the pumping roadway within the construction scope, inserting the water extraction pipe into the drill holes, and injecting a grouting amount with quick initial setting and no water bleeding into the annular space between the two sealing members through the grouting pipe for sealing. Then, the water extraction equipment is used to actively pump water through the water extraction pipe, greatly improving the pumping efficiency of fissure water in the area, shortening the pumping cycle of fissure water, reducing the influence of fissure water on the strength of surrounding rock, improving the roadway support quality to a certain extent, and enhancing the stability of the surrounding rock. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic cross-sectional structure diagram of the pumping roadway provided by the present invention.

[0018] Figure 2 It is a schematic cross-sectional structure diagram of the drill hole provided by the present invention.

[0019] Figure 3 It is a schematic connection diagram of the post-water extraction pipe with the diaphragm pump, the underground sump, and the ground sump provided by the present invention.

[0020] Reference Numerals: 100, side wall; 200, drill hole; 210, sealing structure; 300, water extraction pipe; 310, plugging section; 320, water pumping section; 400, water inlet hole; 500, sealing member; 600, grouting pipe; 700, diaphragm pump; 800, underground sump; 900, ground sump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0022] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0023] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0024] In the embodiments of the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0025] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0026] The following combines Figures 1 - 3 to describe the specific steps of the method for negative pressure pumping of water-containing soft rock of the present invention.

[0027] Figure 1 The sectional structure schematic diagram of the pumping roadway provided by the present invention is exemplified, Figure 2 The sectional structure schematic diagram of the borehole provided by the present invention is exemplified, as Figure 1 and Figure 2 shown, the method for negative pressure pumping of water-containing soft rock includes: Step S100, determining the construction range where the pumping roadway needs to guide fissure water; Step S200, arranging water inlet holes 400 on the water extraction pipe 300, and respectively arranging plugging members 500 at the head and tail of the plugging section 310 of the water extraction pipe 300, and a grouting pipe 600 is arranged inside the plugging member 500 located at the head of the plugging section 310; Step S300, arranging boreholes 200 on the side wall 100 of the pumping roadway within the construction range; Step S400, inserting the water extraction pipe 300 into the borehole 200, and injecting a grouting amount that sets quickly initially and does not bleed water into the annular space between the two plugging members 500 through the grouting pipe 600 for plugging; Step S500, pumping water through the water extraction pipe 300 by using a pumping device.

[0028] For the method for negative pressure pumping of water-containing soft rock provided by the present invention, by arranging boreholes 200 on the side wall 100 of the pumping roadway within the construction range, inserting the water extraction pipe 300 into the boreholes 200, and injecting a grouting amount that sets quickly initially and does not bleed water into the annular space between the two plugging members 500 through the grouting pipe 600 for plugging; then actively pumping water through the water extraction pipe 300 by using a pumping device, the pumping and drainage efficiency of fissure water in the area is greatly improved, the pumping and drainage cycle of fissure water is shortened, the influence of fissure water on the surrounding rock strength is reduced, the roadway support quality is improved to a certain extent, and the stability of the surrounding rock is enhanced.

[0029] In an embodiment of the present invention, the steps of determining the construction range where the pumping roadway needs to guide fissure water include: Step S110, analyzing the distribution characteristics of fissure water in the roadway surrounding rock; Step S110, combining the roadway structure and the fissure water seepage path to delimit the specific boundary of the construction range.

[0030] Specifically, during the construction process of a coal mine roadway, it is first necessary to analyze the distribution characteristics of fissure water in the roadway surrounding rock, and delimit the specific construction range in combination with the roadway structure and the fissure water seepage path. Through this process, the coverage area of the shotcrete sealing pretreatment can be clarified.

[0031] In an embodiment of the present invention, before performing the steps of arranging water inlet holes 400 on the water extraction pipe 300 and respectively arranging plugging members 500 at the head and tail of the plugging section 310 of the water extraction pipe 300, it further includes: Perform shotcreting and sealing pretreatment on the surface of the pumping roadway within the construction scope.

[0032] Specifically, according to the determined construction scope, perform shotcreting and sealing pretreatment on the surface of the pumping roadway. Uniformly spray a high-strength cement slurry material on the surface of the pumping roadway to form a shotcrete layer. The thickness of the shotcrete on the surface of the pumping roadway is greater than or equal to 50 mm, that is, the thickness of the shotcrete layer needs to reach more than 50 mm to ensure that a dense sealing layer is formed on the roadway surface. The existence of the shotcrete layer reduces the further seepage of fissure water, making the borehole 200 form a sealed space. At the same time, the surface of the roadway is initially reinforced, providing stable basic conditions for the subsequent installation of the water extraction pipe 300 and the grouting operation.

[0033] In an embodiment of the present invention, the method for negative pressure water extraction from water-containing soft rock includes: Step S100, determine the construction scope of the pumping roadway that needs to guide fissure water; Step S110, perform shotcreting and sealing pretreatment on the surface of the pumping roadway within the construction scope; Step S200, set water inlet holes 400 on the water extraction pipe 300, and respectively set sealing members 500 at the head and tail of the blocked section 310 of the water extraction pipe 300. A grouting pipe 600 is arranged inside the sealing member 500 located at the head of the blocked section 310; Step S300, set boreholes 200 on the side wall 100 of the pumping roadway within the construction scope; Step S400, insert the water extraction pipe 300 into the borehole 200, and inject a grouting volume that sets quickly and does not bleed water into the annular space between the two sealing members 500 through the grouting pipe 600 for blocking; Step S500, use a water extraction device to extract water through the water extraction pipe 300.

[0034] In an embodiment of the present invention, the step of setting water inlet holes 400 on the water extraction pipe 300 and respectively setting sealing members 500 at the head and tail of the blocked section 310 of the water extraction pipe 300 includes: Step S210, mark the range of the water inlet holes 400, the positions of the water inlet holes 400, and the range of the blocked section 310 on the water extraction pipe 300; Specifically, the material of the water extraction pipe 300 is a PPR pipe. Of course, the specific material of the water extraction pipe 300 is not limited to this, and it can also be other types of pipe bodies. The length of the water extraction pipe 300 is 10 m, among which the length of the plugging section 310 is 3 m, and the length of the water extraction section 320 is 7 m. During processing, according to the distribution characteristics of the fissure water in the roadway surrounding rock and the design specifications of the water extraction pipe 300, mark the layout area, specific positions of the water inlet holes 400, and the scope of the plugging section 310 on the length direction of the water extraction pipe 300. Within the determined range of the water inlet holes 400, mark the specific positions of each group of water inlet holes 400 at a certain interval distance. The positions of each group of water inlet holes 400 should be evenly distributed along the axial direction of the water extraction pipe 300 to ensure that the fissure water can enter the water extraction pipe 300 evenly. Mark the scope of the plugging section 310 on the water extraction pipe 300, and the plugging section 310 is located at the water outlet end of the water extraction pipe 300.

[0035] Step S220, open multiple groups of water inlet holes 400 on the water extraction pipe 300 according to the marked positions of the water inlet holes 400. Among them, each group includes two water inlet holes 400, and the two water inlet holes 400 in the same group are arranged oppositely; Specifically, multiple groups of water inlet holes 400 are opened on the water extraction pipe 300. The multiple groups of water inlet holes 400 are arranged at intervals along the length direction of the water extraction pipe 300. The distance between adjacent two groups of water inlet holes 400 is 50 mm. Each group includes two water inlet holes 400, and the two water inlet holes 400 in the same group are arranged oppositely, that is, the two water inlet holes 400 in the same group are on the same diameter of the water extraction pipe 300. The water inlet holes 400 are circular holes. Of course, the specific type of the water inlet holes 400 is not limited to this, and it can also be strip-shaped holes or other shapes. Setting the water inlet holes 400 can enable the fissure water to enter the water extraction pipe 300 and be discharged through the water extraction pipe 300, improving the drainage efficiency of the fissure water.

[0036] Step S230, arrange the grouting pipe 600 along the length direction of the water extraction pipe 300 at the head of the plugging section 310; Specifically, the grouting pipe 600 is arranged along the length direction of the water extraction pipe 300 at the head of the plugging section 310. The grouting pipe 600 is mainly responsible for injecting the grouting amount with fast initial setting and no bleeding into the annular space between the two plugging members 500, so as to seal the borehole 200 and prevent the leakage of fissure water. The diameter of the grouting pipe 600 is 20 mm, the length of the grouting pipe 600 is 1000 mm, and the grouting pipe 600 is made of a material with a certain strength and corrosion resistance. In this embodiment, the material of the grouting pipe 600 is an aluminum-plastic pipe. Of course, the specific type of the grouting pipe 600 is not limited to this, and other types of pipe bodies can also be used.

[0037] Step S240: Wind the sealing members 500 with a predetermined length at the head and tail of the plugging section 310. Among them, the sealing member 500 located at the head of the plugging section 310 winds the grouting pipe 600 around the outer peripheral surface of the grouting pipe 600.

[0038] At the head and tail of the plugging section 310, it is necessary to wind the sealing members 500 with a predetermined length respectively to form a sealed annular space. The sealing member 500 located at the head of the plugging section 310 not only needs to play a sealing role, but also needs to wind the grouting pipe 600 around the outer peripheral surface of the water extraction pipe 300 to ensure the stability and sealing performance of the grouting pipe 600 during the plugging process. The predetermined length is 180 - 220 mm. Preferably, the predetermined length is 200 mm. The material of the sealing member 500 is a mixture of cotton yarn and polyurethane. The cotton yarn provides the basic structural strength, while the polyurethane endows the sealing member 500 with excellent sealing performance and adaptability, enabling it to adapt to the minute deformation of the borehole wall and ensuring the reliability of the plugging. The distance between the two sealing members 500 is 2560 - 2640 mm. Preferably, the distance between the two sealing members 500 is 2600 mm. When the grouting is completed, the space between the two sealing members 500 will be filled with the grouting volume that sets quickly and does not bleed water to form a solid sealing structure 210, thereby effectively isolating the fissure water, improving the water extraction efficiency, and reducing the influence of the fissure water on the surrounding rock strength.

[0039] In an embodiment of the present invention, the steps of setting the boreholes 200 on the sidewall 100 of the water extraction roadway within the construction scope include: Step S310: Mark the positions of the boreholes 200 on the sidewall 100 of the water extraction roadway within the construction scope; Step S320: Drill holes at the positions of the boreholes 200 through a sidewall anchor drill; Step S330: After the drilling is completed, perform dry hole cleaning on the boreholes 200.

[0040] Specifically, the positions of the boreholes 200 are marked according to the roadway structure and the distribution characteristics of the fissure water. After the boreholes 200 are marked, a sidewall anchor drill is used to drill the boreholes 200 at the marked positions. Two groups of boreholes 200 are set on each sidewall 100, and the two groups of boreholes 200 are arranged at intervals in the up - down direction. Multiple boreholes 200 in the same group are arranged at intervals along the length direction of the water extraction roadway. Specifically, as Figure 1 shown, the left sidewall 100 and the right sidewall 100 are respectively provided with two groups of boreholes 200, and the two groups of boreholes 200 are arranged at intervals in the Figure 1 up - down direction as shown in Figure 1They are arranged at intervals in the front-back direction. The distance between two adjacent boreholes 200 in the same group is 2 m. The distance between the orifice of the lower borehole 200 and the bottom plate of the pumping roadway is 1000 mm. The dip angle of the lower borehole 200 is 1-5°. The upper borehole 200 is arranged at the intersection of the roof and the rib. The angle of elevation of the upper borehole 200 is 1-10°. The diameter of the borehole 200 is 42 mm and the depth is 10000 mm. After the borehole 200 is completed, dry hole cleaning is carried out inside the hole to remove debris and impurities to ensure the insertion of the subsequent water extraction pipe 300 and the grouting effect.

[0041] In an embodiment of the present invention, Figure 3 The schematic diagram showing the connection relationship between the rear water extraction pipe, the diaphragm pump, the underground sump and the ground collection pool provided by the present invention is exemplified, as Figure 3 shown. The steps of pumping water through the water extraction pipe 300 by using the pumping equipment include: Unify the connection of the exposed water extraction pipe 300 through structures such as hoses, elbows or tees, and then connect it to the diaphragm pump 700. After the initial setting of the plugging grouting, operate the diaphragm pump 700 to uniformly extract the fissure water in each borehole 200 to the underground sump 800, and then pump it to the ground collection pool 900 for treatment.

[0042] The method for negative pressure water extraction of water-containing soft rock provided by the present invention is simple to operate, can preferably realize the extraction of fissure water inside the soft rock, reduce the influence of water on the soft rock roadway, improve the surrounding rock stability, and accelerate the rapid excavation and support of the roadway.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for negative pressure pumping of water-containing soft rock, characterized in that, Comprising: Determine the construction range of the pumping roadway that needs to guide fissure water; Set water inlet holes (400) on the water extraction pipe (300), and respectively set sealing members (500) at the head and tail of the sealing section (310) of the water extraction pipe (300). A grouting pipe (600) is arranged inside the sealing member (500) located at the head of the sealing section (310); Set drill holes (200) on the side wall (100) of the pumping roadway within the construction range; Insert the water extraction pipe (300) into the drill hole (200), and inject a grouting volume that sets quickly initially and does not bleed water into the annular space between the two sealing members (500) through the grouting pipe (600) for sealing; Use a water extraction device to extract water through the water extraction pipe (300).

2. The method of negative pressure pumping of water-containing soft rock according to claim 1, characterized in that, Before performing the steps of setting the water inlet holes (400) on the water extraction pipe (300) and respectively setting the sealing members (500) at the head and tail of the sealing section (310) of the water extraction pipe (300), it further includes: Perform shotcrete sealing pretreatment on the surface of the pumping roadway within the construction range.

3. The method for negative pressure pumping of water-containing soft rock according to claim 1, characterized in that, The thickness of the shotcrete on the surface of the pumping roadway is greater than or equal to 50 mm.

4. The method for negative pressure pumping of water-containing soft rock according to claim 1, characterized in that The steps of setting the water inlet holes (400) on the water extraction pipe (300) and respectively setting the sealing members (500) at the head and tail of the sealing section (310) of the water extraction pipe (300) include: Mark the range of the water inlet holes (400), the positions of the water inlet holes (400), and the range of the sealing section (310) on the water extraction pipe (300); Open multiple groups of the water inlet holes (400) on the water extraction pipe (300) according to the marked positions of the water inlet holes (400). Each group includes two water inlet holes (400), and the two water inlet holes (400) in the same group are arranged oppositely; Arrange the grouting pipe (600) at the head of the sealing section (310) along the length direction of the water extraction pipe (300); Wrap the sealing members (500) with a predetermined length at the head and tail of the sealing section (310). The sealing member (500) located at the head of the sealing section (310) wraps the grouting pipe (600) around the outer peripheral surface of the grouting pipe (600).

5. The method for negative-pressure pumping of water-containing soft rock according to claim 4, characterized in that, The predetermined length is 180 - 220 mm, and the material of the sealing member (500) is a mixture of cotton yarn and polyurethane.

6. The method for negative pressure pumping of water-containing soft rock according to claim 4, characterized in that, The distance between the two sealing members (500) is 2560 - 2640 mm.

7. The method for negative pressure pumping of water-containing soft rock according to any one of claims 1 to 6, characterized in that, The diameter of the grouting pipe (600) is 20 mm, and the length of the grouting pipe (600) is 1000 mm.

8. The method for negative pressure pumping of water-containing soft rock according to any one of claims 1 to 6, characterized in that, The steps of setting the drill holes (200) on the side wall (100) of the pumping roadway within the construction range include: Mark the positions of the drill holes (200) on the side wall (100) of the pumping roadway within the construction range; Drill holes at the positions of the drill holes (200) through a rib anchor drill; Perform dry hole cleaning on the drill holes (200) after drilling.

9. The method for negative pressure pumping of water-containing soft rock according to any one of claims 1 to 6, characterized in that, The diameter of the drill hole (200) is 42 mm, and the length of the drill hole (200) is 10000 mm.

10. The method for negative-pressure pumping of water-containing soft rock according to any one of claims 1 to 6, characterized in that, Two sets of the drill holes (200) are arranged on each of the side walls (100). The two sets of the drill holes (200) are arranged at intervals in the vertical direction. A plurality of the drill holes (200) in the same set are arranged at intervals in the length direction of the pumping roadway. The distance between the orifice of the lower drill hole (200) and the bottom plate of the pumping roadway is 1000 mm.

Images