Rock wall and ground drainage system of deep grotto

Abstract

The utility model provides a deep ground cavern rock wall and ground drainage system, a ground drainage unit comprises a ground drainage ditch arranged on a cavern bottom rock, the ground drainage ditch is connected with the outside of a cavern through a drainage tunnel, a top surface drainage unit comprises concave-convex drainage plates which are continuously arranged along the top surface and the wall surface of the cavern rock wall, and the concave-convex drainage plates are connected with the drainage tunnel. The lower end of the concave-convex drainage plate is connected with a ground drainage ditch, the foundation pit drainage unit comprises a foundation pit drainage ditch arranged in a grotto ground foundation pit, the foundation pit drainage ditch is connected with the ground drainage ditch through a water pump, all the drainage units are arranged to be communicated closed drainage spaces, and the closed drainage spaces are isolated from an experiment space of a deep grotto. The drainage tunnel is communicated with the closed drainage space, the mountain seepage water is collected through the closed drainage space and drained out of the deep grotto through the drainage tunnel, timely collection and drainage of the mountain seepage water in the deep grotto are achieved, the grotto space environment humidity is effectively reduced, and the environment condition of a deep experiment can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of deep underground cavern construction, and in particular provides a rock wall and ground drainage system for a deep underground cavern. Background Art

[0002] The Deep Underground Extremely Low Radiation Background Frontier Physics Laboratory was built using the good low cosmic ray flux environment of the mountain tunnels buried thousands of meters deep. It is an important place for conducting major frontier research in the fields of particle physics, astrophysics and cosmology. Figure 5 As shown, the underground experimental hall includes multiple separate deep underground experimental caverns.

[0003] The tunnel group where the underground experimental hall is located is located in the karst area of ​​the mountains, with complex geological conditions. The upper part of the underground cavern where the experimental hall is located covers the mountain with a depth of more than several thousand meters. There is abundant groundwater inside the mountain, and there is an obvious phenomenon of tunnel water gushing. The rock wall of the experimental hall has strong permeability, large water seepage, many leakage points and irregular distribution. The leakage points include dripping water, linear water flow, and small streams of water in some places. The leakage water comes from all directions of the side walls of the underground cavern and the ground. The seepage water is full of water vapor, and the humidity inside the cavern is close to saturation. In order to be suitable for daily use, the environmental humidity of the underground space needs to be reduced from close to saturation to about 65%. Water seepage is not allowed inside the space of the experimental hall, and there are no wet stains on the inner wall surface. To this end, it is necessary to build a complete drainage system on the rock wall and ground of the deep cavern as a basic condition for achieving the above goals. Utility Model Content

[0004] Based on this, the utility model provides a rock wall and ground drainage system for a deep underground cavern, so as to realize the timely collection and discharge of mountain seepage water in the deep underground cavern, effectively reduce the environmental humidity of the cavern space, and meet the environmental conditions of deep underground experiments.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a rock wall and ground drainage system for a deep underground cavern, comprising a ground drainage unit, a top surface drainage unit and a foundation pit drainage unit arranged in the deep underground cavern.

[0006] The ground drainage unit includes a ground drainage ditch arranged in the rock at the bottom of the cave, and the ground drainage ditch is connected to the outside of the cave through a drainage tunnel; the top surface drainage unit includes a concave-convex drainage board continuously arranged along the top surface and wall surface of the cave rock wall, and the lower end of the concave-convex drainage board is connected to the ground drainage ditch; the foundation pit drainage unit includes a foundation pit drainage ditch arranged in the foundation pit on the ground of the cave, and the foundation pit drainage ditch is connected to the ground drainage ditch through a water pump; the ground drainage unit, the top surface drainage unit and the foundation pit drainage unit are arranged as interconnected closed drainage spaces, the closed drainage space is isolated from the experimental space of the deep cave, and the drainage tunnel is connected to the closed drainage space.

[0007] Furthermore, the ground drainage unit is provided with different drainage structures according to different ground slopes: for the part with a ground slope ≥5%, the mountain seepage water flows and gathers along the ground slope; for the part with a ground slope <5%, intercepting ditches are arranged at intervals on the concrete layer, and the intercepting ditches are provided with a slope with a slope of 5‰ from the center point to both ends. The mountain seepage water flows and gathers along the intercepting ditches and then enters the ground drainage ditch, so that the mountain seepage water with different ground slopes can be removed in time.

[0008] Furthermore, the ground drainage ditch is provided with a cover plate, and drainage holes connected to the ground drainage ditch are respectively provided at both ends of the intercepting ditch. Each of the drainage holes penetrates the concrete cushion layer from the bottom of the intercepting ditch to the rock layer. The drainage holes are filled with pebbles with a particle size of 5-10 mm. Water seeping from the rock layer flows into the ground drainage ditch through the drainage holes and the intercepting ditch. A steel grille is provided at the vertical intersection of the intercepting ditch and the ground drainage ditch. The intercepting ditch is filled with pebbles with a particle size of 5-10 mm. A waterproof layer and a ground surface layer are provided on the pebbles to achieve closed drainage of ground mountain seepage and prevent moisture from entering the experimental space during the drainage process.

[0009] Furthermore, the top surface and wall surface of the cave rock wall are provided with a sprayed anchor and steel fiber concrete layer, and the concave-convex drainage board is fully hung on the outside of the sprayed anchor and steel fiber concrete layer with the convex point side facing the rock wall, so as to establish a drainage channel between the top surface and wall surface of the rock wall and the concave-convex drainage board through the convex points, thereby realizing the closed discharge of water seepage from the rock wall.

[0010] Furthermore, the top surface portion of the concave-convex drainage board is connected to the wall surface portion in sequence, and the lower end extends to the ground at the intersection with the ground to the ground drainage ditch. The cover plate of the ground drainage ditch is provided with drainage holes to collect the mountain seepage water flowing down the concave-convex drainage board and flow into the ground drainage ditch through the drainage holes.

[0011] Furthermore, the lower end of the concave-convex drainage board extends to the outside of the ground drainage ditch to form a covering structure for the cover plate, the waterproof layer located outside the concave-convex drainage board extends to the outside of the ground drainage ditch and is connected to the ground waterproof layer, the ground surface layer and the wall surface layer are connected into an integrated structure, realizing a closed connection between the top drainage unit and the ground drainage unit.

[0012] Furthermore, the concave-convex drainage boards are laid sequentially along the cross section of the cavern, the transverse lap joints between the laterally adjacent concave-convex drainage boards are arranged along the water direction and bonded by self-adhesive waterproof tapes, the longitudinal lap joints between the longitudinally adjacent concave-convex drainage boards are double-seamed, and the outer surfaces of the concave-convex drainage boards are sequentially provided with a waterproof layer, a rock wall top surface layer and a wall surface layer.

[0013] Furthermore, the foundation pit drainage ditch includes an annular drainage ditch and a longitudinal drainage ditch which are arranged at the bottom of the foundation pit and are interconnected. The annular drainage ditch is arranged along the periphery of the bottom of the foundation pit, and the longitudinal drainage ditch is arranged perpendicular to the long side of the foundation pit. Each longitudinal drainage ditch and the annular drainage ditch is covered by a cover plate respectively. A sump is also provided at the bottom of the foundation pit. The longitudinal drainage ditch is connected to the sump through the annular drainage ditch. The sump is connected to the ground drainage ditch through a drainage pump, thereby realizing a closed connection between the foundation pit drainage unit and the ground drainage unit.

[0014] The beneficial effects of the rock wall and ground drainage system for a deep cavern provided are as follows:

[0015] First, a ground drainage unit, a top drainage unit and a foundation pit drainage unit are constructed in the deep cavern, and connected to the above drainage units through drainage tunnels to realize the timely collection of dripping water, linear water flow and local small streams of water from the cavern rock wall, the ground and the foundation pit, and timely discharge them through the drainage tunnel to ensure that there is no leakage and seepage in the deep cavern, avoid flooding, and effectively ensure the safe operation of the ultra-deep underground experimental project;

[0016] Secondly, the ground drainage unit, the top surface drainage unit and the foundation pit drainage unit constitute a connected closed drainage space, which isolates the closed drainage space from the experimental space of the deep cavern, avoids the seepage process of mountain seepage, and the entry of water vapor into the cavern during the gathering process, effectively reduces the environmental humidity of the cavern space, and meets the humidity condition requirements for the operation of experimental equipment in the deep cavern;

[0017] Thirdly, the rock wall and ground drainage system of the deep underground cavern provided is constructed in combination with the structural characteristics of the rock wall, cave bottom ground and foundation pit of the deep underground laboratory. It occupies a small space, has few moving parts, has stable daily operation, low energy consumption, is easy to manage and maintain, and is suitable for long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute a part of the specification, describe embodiments of the present invention and are used together with the specification to explain the principles of the present invention. With reference to the accompanying drawings, the present invention can be more clearly understood according to the following detailed description, in which:

[0019] Figure 1 It is a schematic diagram of the structure of draining water seepage from the top surface of a rock wall into a drainage ditch according to an embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of the structure of fixing and sealing the concave-convex drainage board provided in the embodiment of the utility model;

[0021] Figure 3It is a structural schematic diagram of the mountain seepage water being diverted from the intercepting ditch into the drainage ditch according to the embodiment of the utility model;

[0022] Figure 4 It is a schematic diagram of the structure of draining ground foundation pit seepage into a drainage ditch according to an embodiment of the utility model;

[0023] Figure 5 It is a schematic diagram of the overall structure of the deep underground laboratory provided according to an embodiment of the utility model.

[0024] Description of the accompanying drawings:

[0025] 11- ground drainage ditch, 12- intercepting ditch, 13- cover plate, 14- drainage eye, 14'- steel grid, 15- pea stone, 16- waterproof layer, 17- ground surface layer, 18- concrete cushion layer;

[0026] 21-concave-convex drainage board, 22-sprayed anchor and steel fiber concrete layer, 23-convex point, 24-self-adhesive waterproof tape, 25-longitudinal lap joint;

[0027] 31- foundation pit drainage ditch, 32- sump, 33- water pump;

[0028] 4- Rock wall;

[0029] 5- Rocks at the bottom of the cave;

[0030] 6- Bottom of foundation pit;

[0031] 7-Deep underground chamber. DETAILED DESCRIPTION

[0032] The rock wall of the deep underground experimental hall thousands of meters underground is highly permeable, with a large amount of water seepage, many leakage points and irregular distribution. The leaking water comes from the side walls of the underground cavern and all directions on the ground. The seepage water is full of water vapor, and the humidity inside the cavern is close to saturation. In order to be suitable for daily use, the environmental humidity of the underground space needs to be reduced from close to saturation to about 65%. Water seepage is not allowed inside the space of the experimental hall, and there are no wet stains on the inner wall surface.

[0033] To this end, the rock wall and ground drainage system of a deep underground cave provided by the utility model provides a space environment with controllable humidity and no mountain water leakage for the deep underground experimental space, and provides basic conditions for the operation of various deep underground experimental equipment.

[0034] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments herein. In the present invention, when a particular device is described as being between a first device and a second device, there may or may not be an intermediate device between the particular device and the first device or the second device.

[0035] like Figures 1 to 4 As shown, in combination with the structural characteristics of the rock wall, cave bottom and foundation pit of the deep underground laboratory, the constructed drainage system includes a ground drainage unit, a top surface drainage unit and a foundation pit drainage unit arranged in the deep underground cavern 7.

[0036] The ground drainage unit includes a ground drainage ditch 11 arranged in the rock 5 at the bottom of the cave, and the ground drainage ditch 11 is connected to the outside of the cave through a drainage tunnel; the top surface drainage unit includes a concave-convex drainage board 21 continuously arranged along the top surface and wall surface of the cave rock wall 4, and the lower end of the concave-convex drainage board 21 is connected to the ground drainage ditch 11; the foundation pit drainage unit includes a foundation pit drainage ditch 31 arranged in the foundation pit on the ground of the cave, and the foundation pit drainage ditch 31 is connected to the ground drainage ditch 11 through a water pump 33; the ground drainage unit, the top surface drainage unit and the foundation pit drainage unit are arranged as interconnected closed drainage spaces, the closed drainage space is isolated from the experimental space of the deep cave, and the drainage tunnel is connected to the closed drainage space.

[0037] The working principle of the rock wall and ground drainage system of the provided deep underground cavern is as follows: the concave-convex drainage plate 21 of the top drainage unit collects the mountain seepage water from the rock wall 4 above the cavern floor; the ground drainage ditch 11 of the ground drainage unit collects the mountain seepage water from the cavern floor; the foundation pit drainage ditch 31 of the foundation pit drainage unit collects the mountain seepage water from the foundation pit on the cavern floor; the mountain seepage water collected by the top drainage unit, the ground drainage unit and the foundation pit drainage unit converges into the ground drainage ditch 11, flows into the drainage tunnel along the slope of the ground drainage ditch 11, and is then discharged to the outside of the deep underground cavern.

[0038] This system combines the structural characteristics of the rock walls, cave bottom and foundation pit of the deep underground laboratory, constructs interconnected drainage units on the ground, top and foundation pit inside the deep underground cavern, and connects to the above-mentioned drainage units through drainage tunnels to ensure that there is no leakage and seepage in the internal space of the deep underground cavern, avoiding flooding problems. In addition, the ground, top and foundation pit drainage units constitute an interconnected closed drainage space, which is isolated from the experimental space of the deep underground cavern, avoiding the seepage process of mountain seepage and the entry of water vapor into the cavern during the gathering process, effectively reducing the environmental humidity of the cavern space, and meeting the humidity conditions required for the operation of experimental equipment in the deep underground cavern.

[0039] The entire system takes up little space, has few moving parts, is stable in daily operation, and has low energy consumption. It effectively ensures the safe operation of extremely deep underground experimental projects, facilitates management and maintenance, and is suitable for long-term operation.

[0040] 1. Specific structure of ground drainage unit

[0041] like Figure 1 and Figure 3 As shown in the figure, after the cavern is excavated, a 30cm concrete layer is laid on the ground. The ground drainage of the cavern is classified according to the different ground slopes and different drainage structures are adopted. For the part with a ground slope greater than or equal to 5%, the water flows along the longitudinal slope by itself, and the seepage water collection of the rock wall is not considered. For the part with a ground slope less than 5%, a 10cmx10cm (width x height) intercepting ditch 12 is set on the concrete cushion layer every 10m. The intercepting ditch 12 is sloped 5‰ from the center point to both ends, and the seepage water from the mountain flows along the intercepting ditch 12 and then collects into the ground drainage ditch 11.

[0042] The two ends of the intercepting ditch 12 are respectively provided with drainage holes connected to the ground drainage ditch 11, and the hole diameter is not less than 5mm. Each of the drainage holes penetrates the concrete cushion layer 18 from the bottom of the intercepting ditch 12 to the rock layer, and the drainage holes are filled with 5-10mm pebbles 15. The rock layer seepage water flows into the ground drainage ditch 11 through the drainage holes and the intercepting ditch 12, so as to ensure that the rock layer seepage water can flow smoothly into the drainage ditch through the intercepting ditch.

[0043] A steel grid 14' is arranged at the vertical intersection of the intercepting ditch 12 and the ground drainage ditch 11. The intercepting ditch 12 is filled with pebbles 15 with a particle size of 5-10 mm. A waterproof layer 16 and a ground surface layer 17 are arranged on the pebbles 15. The ground drainage ditch 11 is provided with a cover plate 13 to form a closed ground drainage structure.

[0044] (II) Specific structure of the top surface drainage unit

[0045] like Figure 1 and Figure 2 As shown, in order to ensure the stability of the excavated cavern, a 30cm thick steel fiber-mixed concrete layer 22 has been sprayed on the top and wall of the cavern rock wall 4. A high-density polyethylene concave-convex drainage board 21 with a 2mm convex height is fully hung on the cavern wall and top outside the sprayed concrete, with the convex point facing the rock wall 4, and the convex point is used to establish a drainage channel between the top wall of the rock wall 4 and the concave-convex drainage board 21. The concave-convex drainage board is fixed to the rock wall by expansion bolts. The expansion bolts are fixed at a spacing of 0.5m to 0.8m at the top and 1.0m to 1.5m on the wall, and the spacing is increased in places with larger local convexities. The expansion bolts penetrate the drainage board and are sealed with water-expandable rubber rings and polyurethane sealants.

[0046] The concave-convex drainage board 21 is laid according to the cross section of the cavern. The longitudinal lap joint of the drainage board is not less than 10 cm. The two sides of the lap joint are double-seamed by a climbing welding machine to ensure the sealing of the longitudinal joint. The transverse lap joint of the concave-convex drainage board 21 is in the direction of the water flow. Self-adhesive waterproof tape is applied on the transverse joint to ensure the sealing of the transverse joint. The outer surface of the concave-convex drainage board 21 is sequentially provided with a waterproof layer 16, a top surface layer of the rock wall 4 and a wall surface layer.

[0047] The top surface of the concave-convex drainage board 21 is connected to the wall surface in sequence, and the lower end thereof extends to the ground drainage ditch 11 at the intersection with the ground. The cover plate 13 of the ground drainage ditch 11 is provided with drainage holes 14 to collect the mountain seepage water flowing down the concave-convex drainage board 21 and flowing into the ground drainage ditch 11 through the drainage holes 14.

[0048] The lower end of the concave-convex drainage board 21 extends to the outside of the ground drainage ditch 11 to form a covering structure for the cover plate 13. The waterproof layer 16 located outside the concave-convex drainage board 21 extends to the outside of the ground drainage ditch 11 and is connected to the ground waterproof layer 16. The ground surface layer 17 is connected to the wall surface layer as an integrated structure.

[0049] (III) Specific structure of foundation pit drainage unit

[0050] like Figure 4 As shown, according to the operating requirements of the experimental equipment in the experimental hall, some equipment needs to be placed in the foundation pit excavated on the ground. The foundation pit is directly excavated in the underground rock layer of the experimental hall, and the bottom 6 of the foundation pit is lower than other working surfaces, causing the ground seepage in the experimental hall to gather in the pit. For this reason, a foundation pit drainage ditch 31 is set at the bottom of the foundation pit, and the foundation pit drainage ditch 31 includes an annular drainage ditch and a longitudinal drainage ditch that are arranged at the bottom 6 of the foundation pit and connected to each other. The annular drainage ditch is arranged around the bottom 6 of the foundation pit, and the longitudinal drainage ditch is arranged perpendicular to the long side of the foundation pit, and the two are connected. A sump 32 with a slope of 5‰ to one corner of the foundation pit is set in the drainage ditch, and a drainage pump 33 is set to pump it to the ground drainage ditch 11 on both sides of the ground of the experimental hall. Each longitudinal drainage ditch and the annular drainage ditch are covered and leveled by a cover plate 13, and then a waterproof layer and a surface layer are set before installing the experimental equipment.

[0051] Based on the above embodiments, a deep cavern rock wall and ground drainage system is provided, which is applied to the construction of cavern rock wall drainage system in the extremely deep underground extremely low radiation background frontier physics experimental facility project. On the premise of meeting the requirements of deep underground experiments, it provides a solution for the collection and discharge of seepage water from the rock wall of the deep cavern and the ground mountain. The system converges the seepage water from the cavern rock wall and the ground in all directions, and discharges the collected water from the cavern in time through the construction of the drainage system, ensuring that there is no water leakage and seepage in the internal space of the deep cavern, reducing the environmental humidity of the cavern space, and meeting the environmental conditions for the operation of experimental equipment in the deep cavern.

[0052] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0053] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A rock wall and ground drainage system for a deep underground cavern, characterized in that: It comprises a surface drainage unit, a top surface drainage unit and a foundation pit drainage unit which are arranged in a deep underground cavern (7); The ground drainage unit comprises a ground drainage ditch (11) arranged in the rock (5) at the bottom of the cave, and the ground drainage ditch (11) is connected to the outside of the cave through a drainage tunnel; The top surface drainage unit comprises concave-convex drainage boards (21) continuously arranged along the top surface and the wall surface of the cave rock wall (4), and the lower ends of the concave-convex drainage boards (21) are connected to the ground drainage ditch (11); The foundation pit drainage unit comprises a foundation pit drainage ditch (31) arranged in the foundation pit on the ground of the cavern, and the foundation pit drainage ditch (31) is connected to the ground drainage ditch (11) via a water pump (33); The surface drainage unit, the top surface drainage unit and the foundation pit drainage unit are arranged as interconnected closed drainage spaces, the closed drainage space is isolated from the experimental space of the deep underground cavern (7), and the drainage tunnel is connected to the closed drainage space.

2. The rock wall and ground drainage system for a deep underground cavern according to claim 1, characterized in that: The ground drainage unit is provided with different drainage structures according to different ground slopes: in the part with a ground slope of ≥5%, the mountain seepage water flows and gathers along the ground slope; in the part with a ground slope of <5%, intercepting ditches (12) are arranged at intervals on the concrete layer, and the intercepting ditches (12) are provided with a slope surface with a slope of 5‰ from the center point to both ends, and the mountain seepage water flows and gathers along the intercepting ditches (12) and then enters the ground drainage ditch (11).

3. The rock wall and ground drainage system for a deep underground cavern according to claim 2, characterized in that: The ground drainage ditch (11) is provided with a cover plate (13), and drainage holes communicating with the ground drainage ditch (11) are respectively provided at both ends of the intercepting ditch (12), and each of the drainage holes penetrates a concrete cushion layer (18) from the bottom of the intercepting ditch (12) to the rock layer, and the drainage holes are filled with pebbles (15) with a particle size of 5-10 mm. Water seeping from the rock layer flows into the ground drainage ditch (11) through the drainage holes and the intercepting ditch (12). A steel grille (14') is provided at a vertical intersection of the intercepting ditch (12) and the ground drainage ditch (11), and the intercepting ditch (12) is filled with pebbles (15) with a particle size of 5-10 mm. A waterproof layer (16) and a ground surface layer (17) are provided on the pebbles (15).

4. The rock wall and ground drainage system for a deep underground cavern according to claim 1, characterized in that: The top and wall surfaces of the cave rock wall (4) are provided with a sprayed anchor and steel fiber-doped concrete layer (22), and the concave-convex drainage board (21) is fully hung on the outside of the sprayed anchor and steel fiber-doped concrete layer (22) with one side of the protrusion (23) facing the rock wall (4), so as to establish a drainage channel between the top and wall surfaces of the rock wall (4) and the concave-convex drainage board (21) through the protrusion (23).

5. The rock wall and ground drainage system for a deep underground cavern according to claim 4, characterized in that: The top surface portion of the concave-convex drainage board (21) is connected to the wall surface portion in sequence, and the lower end thereof is connected to the ground and extends to the ground drainage ditch (11). The cover plate (13) of the ground drainage ditch (11) is provided with a drainage eye (14) to collect the mountain seepage water flowing down the concave-convex drainage board (21) and flow into the ground drainage ditch (11) through the drainage eye (14).

6. The rock wall and ground drainage system for a deep underground cavern according to claim 5, characterized in that: The lower end of the concave-convex drainage board (21) extends to the outside of the ground drainage ditch (11) to form a covering structure for the cover plate (13); the waterproof layer (16) located outside the concave-convex drainage board (21) extends to the outside of the ground drainage ditch (11) and is connected to the ground waterproof layer (16); the ground surface layer (17) and the wall surface layer are connected to form an integrated structure.

7. The rock wall and ground drainage system for a deep underground cavern according to claim 5 or 6, characterized in that: The concave-convex drainage boards (21) are sequentially laid along the cross section of the cavern; the transverse lap joints between the transversely adjacent concave-convex drainage boards (21) are arranged along the water direction and bonded by a self-adhesive waterproof tape (24); the longitudinal lap joints (25) between the longitudinally adjacent concave-convex drainage boards (21) are double-seam welded; and the outer surfaces of the concave-convex drainage boards (21) are sequentially provided with a waterproof layer (16), a top surface layer of the rock wall (4), and a wall surface layer.

8. The rock wall and ground drainage system for a deep underground cavern according to claim 1, characterized in that: The foundation pit drainage ditch (31) comprises an annular drainage ditch and a longitudinal drainage ditch which are arranged at the bottom of the foundation pit (6) and are connected to each other. The annular drainage ditch is arranged along the periphery of the bottom of the foundation pit (6), and the longitudinal drainage ditch is arranged perpendicular to the long side of the foundation pit. Each longitudinal drainage ditch and the annular drainage ditch are covered by a cover plate (13) respectively. A sump (32) is also arranged at the bottom of the foundation pit. The longitudinal drainage ditch is connected to the sump (32) through the annular drainage ditch, and the sump (32) is connected to the ground drainage ditch (11) through a drainage pump (33).

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