Drainage structure and method for underground air storage hole of compressed air energy storage power station

Abstract

The invention relates to the technical field of underground air storage holes of compressed air energy storage power stations, in particular to a drainage structure and method for an underground air storage hole of a compressed air energy storage power station. The T-shaped groove is excavated on the basis of the circular section in an expanding mode and used for embedding the longitudinal drainage steel floral tube, and the situation that the steel floral tube is damaged under the load effect generated by gas storage high pressure and loses the drainage effect can be avoided. Under the normal operation working condition of the underground gas storage hole, the high external water pressure serves as a favorable load and bears the load generated by high-pressure gas storage in the hole together with the surrounding rock. In the construction period and the emptying maintenance period of the underground gas storage hole, leaked rock mass crack water is pumped out of a plant through the combination of the radial drainage steel floral tube, the longitudinal drainage steel floral tube and the water pump, so that the adverse effect of high external water pressure (adverse load) on a concrete lining and a steel lining sealing layer is effectively reduced; and the external pressure resistance stability of the concrete lining and the steel lining is ensured. Effective conversion between favorable load and unfavorable load of high external water pressure under different working conditions of the gas storage hole can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of underground gas storage caverns of compressed air energy storage power stations, and in particular to a drainage structure and method of underground gas storage caverns of compressed air energy storage power stations. Background Art

[0002] Compressed air energy storage technology is a new type of power energy storage technology with large capacity, long time, high efficiency, flexible layout and relatively short construction period. It can provide peak load regulation, frequency regulation, standby, rotational inertia and accident emergency recovery services for the power system. It meets the needs of building a new power system with new energy as the main body and has a relatively broad space for industrial development. Compressed air energy storage requires a large enclosed space as a gas storage reservoir. At present, the main forms of gas storage are pipeline steel, salt caverns, mine caverns, artificial gas storage caverns, etc. The current cost of pipeline steel is relatively high, which limits the possibility of its large-scale application; the cost of salt caverns is relatively low, but its application is limited by the distribution conditions of natural resources and has certain limitations; mine caverns are widely distributed, but the gas sealing is poor.

[0003] Artificial gas storage caverns have the advantages of flexible site selection, good sealing, safety and reliability, which are conducive to the large-scale promotion and application of compressed air energy storage. However, there are the following problems in the operation of artificial gas storage caverns. The gas storage pressure of the compressed air energy storage system is usually around 10MPa, which belongs to the medium and high pressure range. In order to ensure the safety of the gas storage cavern, the gas storage cavern needs to be buried hundreds of meters underground. When the compressed air energy storage power station is operating normally, the load generated by the high-pressure gas storage is mainly borne by the surrounding rock, and the external water pressure is a favorable load. During the construction period and the emptying and maintenance period of the gas storage cavern, the air pressure in the cavern is normal atmospheric pressure. At this time, the gas storage cavern buried deep underground will bear the external water pressure of hundreds of meters of water head. The external water pressure will be converted from a favorable load to an unfavorable load. The concrete lining and the steel lining sealing layer are damaged because they cannot withstand the high external water pressure. Summary of the invention

[0004] The purpose of the present invention is to provide a drainage structure and method for an underground gas storage cavern of a compressed air energy storage power station, which can solve the technical problem that the concrete lining and steel lining sealing layer of the existing artificial underground gas storage caverns are damaged due to the difficulty in withstanding high external water pressure during the construction period and the emptying and maintenance period. It can realize the effective conversion between favorable load and unfavorable load under different working conditions of the gas storage cavern under high external water pressure.

[0005] To achieve the above purpose, the present invention designs a drainage structure of an underground gas storage cavern of a compressed air energy storage power station, wherein the drainage structure comprises radial drainage steel flower pipes, longitudinal drainage steel flower pipes, a water collection main steel pipe, a drainage main steel pipe, a valve, a water pump, and a water collection well;

[0006] The radial drainage steel pipe extends into the surrounding rock of the cave along the radial direction of the underground gas storage cave, the longitudinal drainage steel pipe is fixed on the rock wall along the center line direction of the underground gas storage cave, and the end of the radial drainage steel pipe is connected to the longitudinal drainage steel pipe;

[0007] The valves and water collection wells of the pumps are all arranged in the pump room of the maintenance traffic tunnel; the main water collection steel pipe connects the longitudinal drainage steel flower pipes to collect the water flow into the water collection well, and the valve is installed at the end of the main water collection steel pipe to control the opening and closing of the water flow discharge; the main drainage steel pipe is connected to the pump and buried outside the factory along the maintenance traffic tunnel;

[0008] The radial drainage steel pipe, the longitudinal drainage steel pipe and the pump are combined to pump the leaked rock fissure water out of the factory through the main water collection steel pipe and the main drainage steel pipe.

[0009] As a preferred solution, the cavity of the underground gas storage cavern is circular, a T-shaped groove is partially excavated on the circular cavity surface along the center line direction of the underground gas storage cavern, and the longitudinal drainage steel pipe is arranged in the T-shaped groove.

[0010] Furthermore, the T-slot rock wall is obliquely drilled with drainage holes in the rock body, and the radial drainage steel flower pipe is buried in the drainage hole.

[0011] Furthermore, there are multiple T-slots, and the radial drainage steel pipes include a first radial drainage steel pipe and a second radial drainage steel pipe. The first radial drainage steel pipe and the second radial drainage steel pipe are arranged at intervals in the drainage holes of two adjacent T-slots, and the first radial drainage steel pipe and the second radial drainage steel pipe are not on the same plane, and are arranged in a plum blossom shape on the unfolded view of the excavation surface of the gas storage cave.

[0012] Furthermore, in the same circular section of the underground gas storage cavern, the first radial drainage steel flower pipes and the second radial drainage steel flower pipes are staggered front and back and cross each other.

[0013] As a preferred solution, the radial drainage steel flower pipe and the longitudinal drainage steel flower pipe are both processed with multiple holes on the surface of the steel pipe, and the holes on the surface of the multiple drainage steel flower pipes are cross-arranged to form a mesh drainage structure.

[0014] As a preferred solution, the outer diameter and wall thickness of the radial drainage steel flower pipe are smaller than the outer diameter and wall thickness of the longitudinal drainage steel flower pipe.

[0015] The present invention also designs a drainage method for an underground gas storage cave of a compressed air energy storage power station, comprising the following steps:

[0016] Excavation of underground gas storage caverns; the underground gas storage caverns are excavated in two phases. The first phase is to excavate a circular section, and the second phase is to dig a groove on the circular section to expand the T-shaped section, forming a circular + T-shaped section structure;

[0017] Drainage holes are drilled obliquely into the rock mass around the underground gas storage cavern, and radial drainage steel pipes are buried in the drainage holes;

[0018] A longitudinal drainage steel pipe is buried in the T-shaped groove along the center line of the underground gas storage cave, and the longitudinal drainage steel pipe is connected with the radial drainage steel pipe;

[0019] Install a steel lining sealing layer on the inner wall of the underground gas storage cave to seal the high-pressure gas;

[0020] Backfill concrete lining between the steel lining sealing layer and the circular + T-slot section structure to transfer the high pressure load in the underground gas storage cave to the rock mass;

[0021] Under normal operating conditions of the underground gas storage cave, close the valve at the outlet of the main steel pipe for water collection, and use the high external water pressure as a favorable load to jointly bear the load generated by the high-pressure gas storage in the gas storage cave with the surrounding rock;

[0022] During the construction period of the underground gas storage cave and during the emptying and maintenance conditions, the valve at the outlet of the main water collection steel pipe is opened and the water pump is started at the same time to pump the leaking rock fissure water out of the factory, forming a drainage and pressure reduction zone outside the rock mass of the gas storage cave, thereby reducing the external water pressure acting on the concrete lining and steel lining sealing layer.

[0023] Beneficial effects of the present invention:

[0024] The present invention provides a drainage structure and method for an underground gas storage cavern of a compressed air energy storage power station.

[0025] (1) The present invention expands a T-shaped groove on the basis of a circular cross-section for burying a longitudinal drainage steel pipe, which can prevent the steel pipe from being damaged under the load generated by the high pressure of the gas storage and losing the drainage effect, while not weakening the ability of the concrete lining to transmit the high-pressure gas storage load.

[0026] (2) The present invention can use the high external water pressure as a favorable load and the surrounding rock to jointly bear the load generated by the high-pressure gas storage in the gas storage cave under normal operating conditions of the underground gas storage cave.

[0027] (3) During the construction period and the emptying and maintenance period of the underground gas storage cavern, the present invention can drain the leaking rock fissure water to the outside of the factory through radial drainage steel pipes, longitudinal drainage steel pipes and water pumps, effectively reducing the adverse effects of high external water pressure (adverse load) on the concrete lining and the steel lining sealing layer, and ensuring the stability of the concrete lining and the steel lining in resisting external pressure.

[0028] The present invention can solve the technical problem that the concrete lining and steel lining sealing layer of the existing artificial underground gas storage caverns are damaged during the construction period and the emptying and maintenance period of the gas storage cavern due to the difficulty in withstanding the high external water pressure. It can realize the effective conversion between the favorable load and the unfavorable load under different working conditions of the gas storage cavern under the high external water pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a flow chart of the present invention;

[0030] Figure 2 It is a schematic plan view of the underground gas storage cave in the present invention;

[0031] Figure 3 For the present invention Figure 2 The enlarged schematic diagram at C in the middle;

[0032] Figure 4 For the present invention Figure 3 Schematic diagram of cross section at AA in the middle;

[0033] Figure 5 For the present invention Figure 4 Schematic diagram of longitudinal section at BB in the middle;

[0034] Figure 6 It is a schematic diagram of the hole arrangement of the radial drainage steel flower pipe in the present invention;

[0035] Figure 7 It is a schematic diagram of the holes on the surface of the drainage steel flower pipe in the present invention.

[0036] Reference numerals:

[0037] 1- rock mass, 2- groundwater level, 3- natural external water pressure head of underground gas storage cavern, 4- rock mass fissure water, 5- underground gas storage cavern, 6- circular section of first phase excavation of underground gas storage cavern, 7- T-slot section of second phase excavation of underground gas storage cavern, 8- first radial drainage steel flower pipe, 9- second radial drainage steel flower pipe, 10- longitudinal drainage steel flower pipe, 11- steel lining sealing layer, 12- concrete lining, 13- underground gas storage cavern gas storage cavity, 14- drainage and pressure reduction area, 15- main water collection steel pipe, 16- valve, 17- water collection well, 18- water pump, 19- main drainage steel pipe, 20- maintenance traffic tunnel, 21- hole. DETAILED DESCRIPTION

[0038] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The present invention relates to a drainage structure and method for effectively reducing the high external water pressure of an underground gas storage cavern of a compressed air energy storage power station. Under the normal operating conditions of the underground gas storage cavern, the high external water pressure can be used as a favorable load to bear part of the load generated by the high-pressure gas storage in the cavern. At the same time, during the construction period of the underground gas storage cavern and the emptying and maintenance conditions, the rock mass fissure water is pumped out of the factory through radial drainage steel pipes, longitudinal drainage steel pipes and water pumps, effectively reducing the impact of high external water pressure (unfavorable load) on the concrete lining and the steel lining sealing layer, and ensuring the stability of the concrete lining and the steel lining in resisting external pressure. On the basis of the circular section of the artificial underground gas storage cavern, a T-shaped groove is partially excavated, and drainage holes are drilled in the rock body on the rock wall of the T-shaped groove. Radial drainage steel pipes are buried in the holes, and each radial drainage hole is staggered front and back and crossed in pairs. The longitudinal drainage steel pipes are arranged in the groove, and the radial drainage steel pipes are connected to the longitudinal drainage steel pipes to form a three-dimensional mesh drainage curtain.

[0042] The technical solution of the embodiment of the present invention will be further described in detail below with reference to the accompanying drawings.

[0043] like Figure 1 As shown, the present invention provides a method for draining an underground gas storage cavern of a compressed air energy storage power station, comprising the following steps:

[0044] Excavation of underground gas storage caverns; the underground gas storage caverns are excavated in two phases. The first phase is to excavate a circular section, and the second phase is to dig a groove on the circular section to expand the T-shaped section, forming a circular + T-shaped section structure;

[0045] Drainage holes are drilled into the rock mass around the underground gas storage caverns, and radial drainage steel pipes are buried in the drainage holes;

[0046] A longitudinal drainage steel pipe is buried in the T-shaped groove along the center line of the underground gas storage cave, and the longitudinal drainage steel pipe is connected with the radial drainage steel pipe;

[0047] Install a steel lining sealing layer on the inner wall of the underground gas storage cave to seal the high-pressure gas;

[0048] Backfill and pour concrete lining between the steel lining sealing layer and the circular + T-slot section structure to transfer the high pressure load in the underground gas storage cavity to the rock mass;

[0049] Under normal operating conditions of the underground gas storage cave, close the valve at the outlet of the main steel pipe for water collection, and use the high external water pressure as a favorable load to jointly bear the load generated by the high-pressure gas storage in the cave with the surrounding rock;

[0050] During the construction period of the underground gas storage cave and during emptying and maintenance, the valve at the outlet of the main water collection steel pipe is opened and the water pump is started at the same time to pump the rock fissure water out of the factory, forming a drainage and pressure reduction zone outside the rock mass of the gas storage cave, thereby reducing the external water pressure acting on the concrete lining and steel lining sealing layer.

[0051] like Figure 2 As shown, the present invention provides a drainage structure of an underground gas storage cavern of a compressed air energy storage power station, the drainage structure comprising an underground gas storage cavern, radial drainage steel flower pipes, longitudinal drainage steel flower pipes, concrete lining, steel lining sealing layer, water collection main steel pipe, drainage main steel pipe, water collection well, water pump, and maintenance traffic tunnel. A circular runway-type underground gas storage cavern 5 is artificially excavated in the underground rock mass 1. Figure 3 As shown, the underground gas storage cavern is designed to bear the load generated by high-pressure gas storage. It is usually buried hundreds of meters underground, with a high groundwater level and a large external water pressure. The underground gas storage cavern 5 is connected to the ground through a maintenance traffic tunnel 20, which serves as a passage during the construction and operation periods. Assuming that the gas pressure of the compressed air energy storage power station gas storage cavern is 10Mpa and the inner diameter is 15m, the surrounding rock is mainly used to bear the high-pressure gas load. The minimum covering thickness of the rock mass of the pressurized tunnel body is approximately calculated according to the Norwegian standard. The thickness of the rock mass overlying the underground gas storage cavern 5 needs to reach about 400m. Figure 4 As shown, if the groundwater level 2 is high and close to the surface, the external water pressure head 3 of the underground gas storage cave 5 is about 400m (4Mpa).

[0052] like Figure 4As shown, the artificial underground gas storage cavern 5 is composed of a circular section 6 and a T-slot section 7, and is excavated in two phases. The first phase excavates a circular section 6 with an excavation diameter of 16.2m (inner diameter 15m, concrete lining 0.6m); the second phase excavates 8 symmetrically distributed T-slot sections 7 on the circular excavation surface 6. Drainage holes are drilled obliquely into the rock mass 1 on both sides of the 8 T-slot rock wall surfaces 7, and the first radial drainage steel flower pipe 8 and the second radial drainage steel flower pipe 9 are buried in the holes. The drainage holes are staggered front and back and cross each other to form a three-dimensional mesh drainage curtain.

[0053] The diameter of the oblique drainage hole is 110mm and the depth is 12m. Figure 5 and Figure 6 As shown, the first radial drainage steel flower pipe 8 and the second radial drainage steel flower pipe 9 are arranged in a plum blossom shape on the unfolded view of the excavation surface of the gas storage cave.

[0054] A longitudinal drainage steel pipe 10 is installed in the T-slot 7 along the center line of the tunnel, and the first radial drainage steel pipe 8 and the second radial drainage steel pipe 9 are connected to the longitudinal drainage steel pipe 10 to facilitate the water flow of the first radial drainage steel pipe 8 and the second radial drainage steel pipe 9 to flow into the longitudinal drainage steel pipe 10.

[0055] like Figure 7 As shown, the drainage steel flower pipe is punched on the surface of the steel pipe to form a plurality of holes 21 for water seepage. The outer diameter of the first radial drainage steel flower pipe 8 and the second radial drainage steel flower pipe 9 is 100 mm, and the wall thickness is 4 mm. The outer diameter of the longitudinal drainage steel flower pipe 10 is 200 mm, and the wall thickness is 8 mm, which can ensure that the gas in the underground gas storage cave 5 will not be damaged under the high pressure load of 10 MPa.

[0056] like Figure 4 As shown, a steel lining sealing layer 11 for high-pressure gas sealing is installed on the inner wall of the underground gas storage cave 5. The inner diameter of the steel lining sealing layer is 15m, and the wall thickness is at least 22mm according to the structural requirements. A concrete lining 12 is backfilled between the steel lining sealing layer 11 and the rock wall surface excavated from the underground gas storage cave 5. The lining thickness is 0.6m to 1.2m, which is used to transfer the high-pressure load in the gas storage cavity 13 of the underground gas storage cave to the rock mass 1.

[0057] like Figure 3As shown, at the end of the maintenance tunnel 20, the longitudinal drainage steel pipes 10 are connected by a water collection main steel pipe 15, so that the water flow is collected in the lower water collection well 17 of the water pump room in the maintenance tunnel 20. A valve 16 is installed at the end of the water collection main steel pipe 15 to control the opening and closing of the water flow discharge. The water collection well 17 is arranged at the lower part of the water pump room in the maintenance tunnel 20, and the water pump equipment 18 is arranged at the upper part. The water pump 18 is connected to the drainage main steel pipe 19 and buried outside the factory along the maintenance tunnel 20. When the underground gas storage cave 5 is operating normally, the pressure of the gas storage cavity 13 is in a high pressure state. In order to use the surrounding rock pressure and high external water pressure to bear the load generated by the high pressure of the gas storage, the valve 16 at the end of the water collection main steel pipe 15 in the maintenance tunnel 20 is closed to prevent the rock fissure water 4 from flowing out along the first radial drainage steel pipe 8, the second radial drainage steel pipe 9 and the longitudinal drainage steel pipe 10.

[0058] During the construction period and the emptying and maintenance period of the underground gas storage cavern 5, the pressure of the gas storage cavity 13 is normal atmospheric pressure, and the valve 16 at the end of the main water collection steel pipe 15 in the maintenance traffic tunnel 20 can be opened, and the pump 18 can be started at the same time. The rock mass fissure water 4 infiltrates into the first radial drainage steel flower pipe 8 and the second radial drainage steel flower pipe 9, and then flows into the longitudinal drainage steel flower pipe 10, and is collected in the main water collection steel pipe 15 and the water collection well 17, and is pumped out of the factory through the pump 18 and the main drainage steel pipe 19, forming a drainage pressure reduction zone 14 outside the rock mass of the underground gas storage cavern 5, effectively reducing the external water pressure acting on the concrete lining 12 and the steel lining sealing layer 11, and ensuring the stability of the concrete lining 12 and the steel lining 11 against external pressure.

[0059] The technology of the present invention has high practical and economic value in providing a better method of reducing the external water pressure of underground gas storage caverns, higher reliability and more flexible construction methods. The invention helps to promote the application of compressed air energy storage technology in practice and the development of the energy storage industry, thereby achieving more efficient and environmentally friendly energy storage and utilization. It has broad social significance and application value, and is of great significance for promoting sustainable development, improving energy utilization efficiency and environmental protection.

[0060] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A drainage structure for an underground gas storage cavern of a compressed air energy storage power station, characterized in that: The drainage structure includes radial drainage steel pipes, longitudinal drainage steel pipes, water collection main steel pipes, drainage main steel pipes, valves, water pumps, and water collection wells; the radial drainage steel pipes extend into the surrounding rock of the cave along the radial direction of the underground gas storage cave; the longitudinal drainage steel pipes are fixed on the rock wall along the center line direction of the underground gas storage cave; the ends of the radial drainage steel pipes are connected to the ends of the longitudinal drainage steel pipes; The valves, pumps and water collection wells are arranged in the pump room of the maintenance traffic tunnel. The main water collection steel pipe connects the longitudinal drainage steel pipes to collect water into the water collection well. The valve is installed at the end of the main water collection steel pipe to control the opening and closing of water discharge. The main drainage steel pipe is connected to the pump and buried outside the factory along the maintenance traffic tunnel. The radial drainage steel pipe, the longitudinal drainage steel pipe and the pump are combined to pump the leaked rock fissure water out of the factory through the main water collection steel pipe and the main drainage steel pipe.

2. The drainage structure of an underground gas storage cavern of a compressed air energy storage power station according to claim 1, characterized in that: The cavity of the underground gas storage cavern is circular, and a T-shaped groove is partially excavated on the circular cavity surface along the center line direction of the underground gas storage cavern, and the longitudinal drainage steel flower pipe is arranged in the T-shaped groove.

3. The drainage structure of the underground gas storage cavern of a compressed air energy storage power station according to claim 2 is characterized by: The T-slot rock wall is obliquely drilled with drainage holes facing the rock body, and the radial drainage steel flower pipe is buried in the drainage hole.

4. The drainage structure of the underground gas storage cavern of a compressed air energy storage power station according to claim 3 is characterized by: There are multiple T-slots, and the radial drainage steel pipes include a first radial drainage steel pipe and a second radial drainage steel pipe. The first radial drainage steel pipe and the second radial drainage steel pipe are arranged at intervals in the drainage holes of two adjacent T-slots, and the first radial drainage steel pipe and the second radial drainage steel pipe are not on the same plane, and are arranged in a plum blossom shape on the unfolded view of the excavation surface of the gas storage cave.

5. The drainage structure of the underground gas storage cavern of the compressed air energy storage power station according to claim 4 is characterized by: In the same circular section of the underground gas storage cavern, the first radial drainage steel flower pipes and the second radial drainage steel flower pipes are staggered front and back and cross each other.

6. A drainage structure for an underground gas storage cavern of a compressed air energy storage power station according to any one of claims 1 to 5, characterized in that: The radial drainage steel flower pipe and the longitudinal drainage steel flower pipe are both processed with multiple holes on the surface of the steel pipe, and the multiple holes are cross-arranged to form a mesh drainage structure.

7. The drainage structure of the underground gas storage cavern of the compressed air energy storage power station according to claim 6 is characterized by: The outer diameter and wall thickness of the radial drainage steel flower pipe are both smaller than the outer diameter and wall thickness of the longitudinal drainage steel flower pipe.

8. A method for draining underground gas storage caverns of a compressed air energy storage power station, characterized in that: The following steps are included: Excavation of underground gas storage caverns; The underground gas storage cavern was excavated in two phases. The first phase excavated a circular section, and the second phase excavated a T-shaped section on the circular section to form a circular + T-shaped section structure. Drainage holes are drilled obliquely into the rock mass around the underground gas storage cavern, and radial drainage steel pipes are buried in the drainage holes; A longitudinal drainage steel pipe is buried in the T-shaped groove along the center line of the underground gas storage cave, and the longitudinal drainage steel pipe is connected with the radial drainage steel pipe; Install a steel lining sealing layer on the inner wall of the underground gas storage cave to seal the high-pressure gas; Backfill concrete lining between the steel lining sealing layer and the circular + T-slot section structure to transfer the high pressure load in the underground gas storage cave to the rock mass; Under normal operating conditions of the underground gas storage cave, close the valve at the outlet of the main steel pipe for water collection, and use the high external water pressure as a favorable load to jointly bear the load generated by the high-pressure gas storage in the gas storage cave with the surrounding rock; During the construction period of the underground gas storage cave and during the emptying and maintenance conditions, the valve at the outlet of the main water collection steel pipe is opened and the water pump is started at the same time to pump the leaking rock fissure water out of the factory, forming a drainage and pressure reduction zone outside the rock mass of the gas storage cave, thereby reducing the external water pressure acting on the concrete lining and steel lining sealing layer.

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