Existing cavern compressed air energy storage physical model test system

Abstract

The utility model relates to an existing cavern compressed air energy storage physical model test system, which comprises a physical model, a hydraulic loading system, an air circulation charging and discharging system and a monitoring system, and is characterized in that the physical model comprises a surrounding rock and an air storage part, the surrounding rock comprises an external rock block and an internal rock block, the internal rock block is provided with a hole, and the hole penetrates through the internal rock block along the axial direction of the internal rock block; one or more prefabricated cracks are formed in the wall of the hole, the outer rock block is arranged on the outer side of the inner rock block in a surrounding mode, at least part of the air storage part is arranged on the two sides of the inner rock block in the axial direction, and the air storage part can seal the hole; the hydraulic loading system can apply a load from an external rock block to an internal rock block to the physical model, and the air circulation inflation and deflation system can inflate and deflate the hole; the monitoring system comprises a monitoring instrument and a data acquisition system, the monitoring instrument can perform data monitoring on the physical model, and the data acquisition system is in data connection with the monitoring instrument and can perform data transmission and processing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressed air energy storage, in particular to a physical model test system for compressed air energy storage of existing caverns. BACKGROUND

[0002] Compressed air energy storage is a large-scale long-time energy storage technology with great development potential, and large underground gas storage devices are an important part of it. In addition to newly built caverns, abandoned mines, hydropower caverns and other underground idle spaces can also be used as compressed air storage. It is green and environmentally friendly, and avoids waste of resources. From existing caverns to compressed air storage, it is necessary to undergo modification and treatment to ensure the sealing and stability of high-pressure gas storage. The characteristics of existing caverns are that the surrounding rock damage is inevitable during the excavation and shaping stage, and the cross section of the cavern is generally arched. To ensure the sealing and stability of the existing cavern used as compressed air storage, it is necessary to take reasonable and effective modification measures, which is the key to the utilization of existing caverns. Since there is no existing cavern compressed air energy storage power station in operation at present, there is no relevant successful experience of modification and implementation, therefore, it is necessary to carry out comparative research on different sealing structure forms in view of the arched cross section of the existing cavern and the existing damage characteristics, so as to solve the modification and application problems of the existing cavern. CONTENT OF THE UTILITY MODEL

[0003] The embodiment of the present application provides a physical model test system for compressed air energy storage of existing caverns, which can simulate the operation performance of the existing cavern used as compressed air storage.

[0004] The physical model test system for compressed air energy storage of existing caverns provided by the embodiment of the present application comprises: a physical model, wherein the physical model comprises surrounding rock and a gas storage part; the surrounding rock comprises an external rock block and an internal rock block; the internal rock block has a hole, the hole penetrates the internal rock block along the axial direction of the internal rock block, and one or more pre-prepared cracks are arranged on the hole wall; the external rock block is arranged outside the internal rock block in a closed manner, and the external rock block is tightly attached to the internal rock block to transfer the load; and the gas storage part is arranged at least partially on both sides of the internal rock block along the axial direction, and the gas storage part can seal the hole.

[0005] A hydraulic loading system and an air circulation charging and discharging system, wherein the hydraulic loading system can apply a load from the external rock block to the internal rock block to the physical model, and the air circulation charging and discharging system can charge and discharge air into the hole.

[0006] A monitoring system comprising a monitoring instrument and a data acquisition system, wherein the monitoring instrument can monitor the data of the physical model, and the data acquisition system is connected with the monitoring instrument and can transmit and process the data.

[0007] In addition, the physical model test system for the cavity compressed air energy storage provided by the embodiments of the present application can also have the following additional technical features.

[0008] In an alternative scheme, the air circulation charging and discharging system comprises a gas feeding pipeline and a gas discharging pipeline, the gas feeding pipeline and the gas discharging pipeline are communicated with the hole through a gas feeding pipe column, the gas feeding pipeline is capable of injecting compressed air of a preset temperature and pressure into the hole, and the gas discharging pipeline is capable of discharging the gas in the hole.

[0009] In an alternative scheme, the gas feeding pipeline comprises a pipeline-connected compressor, a heat exchanger, a first valve, a first flow meter and a pressure gauge; and the gas discharging pipeline comprises a pipeline-connected second valve and a second flow meter.

[0010] In an alternative scheme, the surrounding rock further comprises a sealing structure, the sealing structure is arranged on the inner wall of the internal rock mass, the sealing structure comprises a sealing layer and a lining, the material of the sealing layer is at least one of a steel lining, rubber, glass fiber reinforced plastic and a coating, the lining is located between the internal rock mass and the sealing layer, and the lining is formed by backfilling of concrete.

[0011] In an alternative scheme, the monitoring instrument comprises a pressure monitor, a temperature monitor, a steel plate stress gauge, a lining strain gauge, a surrounding rock joint meter and a surrounding rock strain gauge, the pressure monitor and the temperature monitor are located at the middle position of the hole, the steel plate stress gauge is arranged on the outer wall of the sealing layer, the lining strain gauge is arranged inside the lining, the surrounding rock joint meter is arranged at the prefabricated crack, and the surrounding rock strain gauge is arranged around the external rock mass and is arranged in a 45° angle distribution.

[0012] In an alternative scheme, the shape of the external rock mass is a cuboid, the cross section of the external rock mass is a square, the thickness of the external rock mass is less than the side length of the square, and the cross section of the hole is in an arch shape; the shape of the sealing layer is an elliptical shape, a double circular shape or a city gate shape.

[0013] In an alternative scheme, the physical model further comprises a fixing plate, a loading plate and a bearing base, the fixing plate is arranged on the opposite side of the external rock mass along a first direction, the first direction is the axial direction of the internal rock mass, the bearing base is arranged at the bottom of the external rock mass, and the fixing plate is fixedly connected with the bearing base; the number of the loading plates is plural, and the plural loading plates are respectively arranged on the top of the external rock mass and the outer wall of the external rock mass adjacent to the side of the fixing plate, and the loading plates are directly or indirectly connected with the hydraulic loading system and bear the load.

[0014] In an alternative scheme, the gas storage part comprises sealing plugs, a restraint disc and a rigid rod, the sealing plugs are arranged on the two sides of the hole along the axial direction respectively, the restraint disc is arranged on the side of the sealing plugs away from each other, and the rigid rod passes through the hole and is connected with the sealing plugs and the restraint disc on the two sides through bolts.

[0015] In an alternative scheme, the fixed plate is provided with a through hole at the position corresponding to the hole, the sealing plug partially passes through the through hole and blocks the hole, a sealing ring is arranged between the sealing plug and the hole wall of the through hole, and the restraint disc is located outside the fixed plate and abuts against the fixed plate; a triangular fixing seat is arranged between the load bearing base and the fixed plate.

[0016] In an alternative scheme, the hydraulic loading system comprises a hydraulic head, a loading frame, a hydraulic power system and a computer; the hydraulic head is connected with the hydraulic power system and the computer through a line pipe, one end of the hydraulic head abuts against the loading frame, and the other end abuts against the outer wall of the surrounding rock.

[0017] The embodiment of the present application has the following beneficial effects:

[0018] The existing cavern gas storage physical model test system can restore the characteristics of the existing cavern, simulate and record the operation performance of the existing cavern after being used as a compressed air storage, has a simple principle and is convenient to operate; the surrounding rock includes external rock blocks and internal rock blocks, the external rock blocks can be reused, the internal rock blocks can be prepared with pre-prepared cracks or pre-embedded monitoring instruments, the preparation engineering quantity of the model is reduced while the reasonable mechanical boundary is met. The incoordination effect of the two kinds of surrounding rocks can be offset through comparative tests, and the evaluation of the scheme is not affected. In addition, the test system can also study the advantages and disadvantages of the existing cavern transformation measures by changing the sealing materials and structural forms, compare and select the optimal transformation scheme, and thus provide a basis for actual engineering.

[0019] It should be understood that the foregoing general description and the following detailed description are only exemplary and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The overall schematic diagram of the existing cavern gas storage physical model test system provided by the present application is shown in the figure;

[0021] Figure 2 The structural schematic diagram of the physical model in a specific embodiment provided by the present application is shown in the figure;

[0022] Figure 3 The arrangement schematic diagram of the monitoring instruments in the physical model provided by the present application is shown in the figure;

[0023] Figure 4 The structural schematic diagram of the physical model in a specific embodiment provided by the present application is shown in the figure;Figure 3 Schematic diagram of side view structure of monitoring instrument arrangement.

[0024] Figures: surrounding rock 1, external rock mass 11, internal rock mass 12, hole 13, sealing layer 14, lining 15, fixed plate 16, loading plate 17, load-bearing base 18, triangular fixing seat 19, gas storage part 2, sealing plug 21, restraint disc 22, rigid rod 23, sealing ring 24, hydraulic loading system 3, hydraulic head 31, loading frame 32, hydraulic power system 33, computer 34, air circulation charging and discharging system 4, gas delivery pipe column 41, compressor 42, heat exchanger 43, first valve 44, first flow meter 45, pressure gauge 46, second valve 47, second flow meter 48, monitoring instrument 5, pressure monitoring meter 51, temperature monitoring meter 52, steel plate stress meter 53, lining strain meter 54, surrounding rock joint meter 55, surrounding rock strain meter 56, data acquisition system 6.

[0025] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application. DETAILED DESCRIPTION

[0026] For better understanding of the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the drawings.

[0027] It should be clear that the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other technical solutions obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0028] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0029] It should be understood that the term "and / or" used herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0030] It should be noted that the "upper", "lower", "left", "right" and other orientation words described in the embodiments of the present application are described from the angle shown in the drawings, and should not be understood as a limitation on the embodiments of the present application. In addition, it should also be understood in the context that when referring to an element connected to another element "on" or "under", it can be directly connected to another element "on" or "under" or indirectly connected to another element "on" or "under" through an intermediate element.

[0031] As Figures 1-4 shown, the embodiments of the present application provide a kind of existing cavern compressed air energy storage physical model test system, the existing cavern compressed air energy storage physical model test system includes physical model, hydraulic loading system 3, air circulation fills and discharges system 4 and monitoring system. Wherein, physical model includes surrounding rock 1 and gas storage part 2, surrounding rock 1 includes external rock block 11 and internal rock block 12, internal rock block 12 has hole 13, hole 13 is along the axial direction of internal rock block 12 and passes through internal rock block 12, and one or more precast cracks are arranged on the hole wall of hole 13, external rock block 11 is perimetrically arranged on the outside of internal rock block 12, and external rock block 11 is closely attached to internal rock block 12 to transfer load, gas storage part 2 is at least partially arranged on both sides of internal rock block 12 along the axial direction, and gas storage part 2 can seal hole 13;Hydraulic loading system 3 can apply load from the direction of external rock block 11 to internal rock block 12 to physical model, air circulation fills and discharges system 4 can fill air and exhaust in hole 13;Monitoring system includes monitoring instrument 5 and data acquisition system 6, monitoring instrument 5 can monitor data of physical model, data acquisition system 6 is data connected with monitoring instrument 5 and can transmit and process data.

[0032] In the embodiments, the existing cavern compressed air energy storage physical model test system can restore the characteristics of the existing cavern more realistically, simulate and record the operating performance of the existing cavern used as a compressed air storage, has simple principle and convenient operation;Surrounding rock 1 includes external rock block 11 and internal rock block 12, external rock block 11 can be reused, internal rock block 12 can be prepared by fine preparation, precast cracks or pre-embedded monitoring instrument 5, while meeting reasonable mechanical boundary, reduces the model preparation engineering quantity. And comparative test can offset the incoordination effect of two kinds of surrounding rock 1, without affecting the evaluation of scheme, i.e. can carry out test under multiple surrounding rock 1 and multiple sealing schemes, and evaluate the advantages and disadvantages of different existing cavern reconstruction schemes.

[0033] As Figures 1-2As shown in the figure, in a specific embodiment, the air circulation charging and discharging system 4 comprises an air feeding pipeline and an air exhaust pipeline, which are connected with the hole 13 through the air feeding pipe column 41. The air feeding pipeline can inject compressed air of preset temperature and pressure into the hole 13, and the air exhaust pipeline can exhaust the gas in the hole 13. Specifically, the air feeding pipeline comprises a pipeline-connected compressor 42, a heat exchanger 43, a first valve 44, a first flow meter 45 and a pressure gauge 46; the air exhaust pipeline comprises a pipeline-connected second valve 47 and a second flow meter 48. The air in the air feeding pipeline forms compressed air of certain temperature and pressure after passing through the compressor 42 and the heat exchanger 43, is switched and flow controlled through the first valve 44, and the injection air flow and pressure data are monitored through the first flow meter 45 and the pressure gauge 46, and then enters the hole 13 through the air feeding pipe column 41. The air exhaust pipeline is connected with the air feeding pipe column 41 at one end and with the outside at the other end, and is switched controlled through the second valve 47 and the rate is monitored through the second flow meter 48.

[0034] As shown in the figure, Figures 2-4 As shown in the figure, in a specific embodiment, the surrounding rock 1 further comprises a sealing structure, which is arranged on the inner wall of the internal rock mass 12 and comprises a sealing layer 14 and a lining 15. The material of the sealing layer 14 is at least one of steel lining, rubber, glass steel and coating, and the lining 15 is formed by backfilling of concrete between the internal rock mass 12 and the sealing layer 14. When the experiment is carried out, the advantages and disadvantages of the existing cavern reconstruction measures can be studied by changing the sealing materials and structure forms, the optimal reconstruction scheme can be selected, and thus the basis for actual engineering can be provided.

[0035] As shown in the figure, Figures 3-4 As shown in the figure, in a specific embodiment, the monitoring instrument 5 comprises a pressure monitor 51, a temperature monitor 52, a steel plate stress meter 53, a lining strain meter 54, a surrounding rock joint meter 55 and a surrounding rock strain meter 56. The pressure monitor 51 and the temperature monitor 52 are located at the middle position of the hole 13, the steel plate stress meter 53 is arranged on the outer wall of the sealing layer 14, the lining strain meter 54 is arranged inside the lining 15, the surrounding rock joint meter 55 is arranged at the prefabricated crack, and the surrounding rock strain meter 56 is arranged around the external rock mass 11 and is arranged in a 45° angle distribution. The whole monitoring instrument 5 is arranged at the middle section of the thickness of the surrounding rock 1, which is the weakest section and can best simulate the plane strain state.

[0036] As shown in the figure, Figures 1-4 As shown in the figure, in a specific embodiment, the external rock mass 11 is in the shape of a cuboid, the section thereof is a square, the thickness of the external rock mass 11 is less than the side length of the square, and the cross-sectional shape of the hole 13 is an arch shape. The sealing layer 14 is in the shape of an ellipse, a double circle or a city gate shape, and the lining 15 is formed by backfilling of concrete according to the shape of the sealing layer 14 and is attached to the hole wall and the sealing layer 14.

[0037] As Figures 1-2 shown, in a specific embodiment, the physical model further comprises a fixed plate 16, a loading plate 17 and a bearing base 18, the fixed plate 16 is arranged on the opposite side of the external rock mass 11 along the first direction, the first direction is the axial direction of the internal rock mass 12, the bearing base 18 is arranged at the bottom of the external rock mass 11, and the fixed plate 16 is fixedly connected with the bearing base 18; the number of the loading plate 17 is multiple, and the multiple loading plates 17 are respectively arranged at the top of the external rock mass 11 and the outer wall of the external rock mass 11 adjacent to the side of the fixed plate 16, and the loading plate 17 is directly or indirectly connected with the hydraulic loading system 3 and bears the load.

[0038] As Figure 1 shown, in a specific embodiment, the hydraulic loading system 3 comprises a hydraulic head 31, a loading frame 32, a hydraulic power system 33 and a computer 34; the hydraulic head 31 is connected with the hydraulic power system 33 and the computer 34 through a line pipe, one end of the hydraulic head 31 abuts against the loading frame 32, and the other end abuts against the outer wall of the surrounding rock 1. Specifically, the hydraulic head 31 is distributed at the top and both sides of the physical model, one end is connected with the loading frame 32, and the other end can be telescoped on the loading plate 17 to exert pressure. Among them, the side pressure is exerted on both sides, and the overburden pressure is exerted on the top. The hydraulic head 31 and the loading frame 32 are connected with the hydraulic power system 33 and the computer 34 through the line pipe to realize and control the pressure loading.

[0039] As Figure 2 shown, in a specific embodiment, the gas storage part 2 comprises a sealing plug 21, a constraint disc 22 and a rigid rod 23, the sealing plugs are respectively arranged on the two sides of the hole 13 along the axial direction, the constraint disc 22 is arranged on the side away from each other of the sealing plugs, and the rigid rod 23 passes through the hole 13 and is connected with the sealing plugs and the constraint disc 22 on both sides through bolts.

[0040] As Figure 2 shown, in a specific embodiment, the fixed plate 16 is provided with a through hole at the position corresponding to the hole 13, the sealing plug partially passes through the through hole and blocks the hole 13, a sealing ring 24 is arranged between the sealing plug and the hole wall of the through hole, and the constraint disc 22 is located on the outer side of the fixed plate 16 and abuts against the fixed plate 16; the bearing base 18 is provided with a triangular fixing base 19 between the fixed plate 16.

[0041] In the preparation of the test model, the external rock mass 11 is kept for long-term use, and the internal rock mass 12 is proportioned and poured according to different rock characteristics. When pouring, the mold is reserved with a hole 13, and a damage crack is formed on the hole wall by a partition plate to form the internal surrounding rock 1. According to the set material and form scheme of the sealing layer 14 (for example, an elliptical steel lining), the elliptical steel lining is formed, and the fixed position of the mold is prevented, and then the concrete lining 15 is poured and formed around. During the preparation of the gas storage model, the monitoring instrument 5 in the surrounding rock 1 and the lining 15 is pre-buried, and the model is completed together with the monitoring arrangement. The prepared surrounding rock 1 model is vertically placed, and the fixing plate 16 is installed on the front and rear square surfaces, embedded in the base and fixed by using a triangular seat. The sealing plug 21, the restraint disc 22 and the rigid rod 23 are installed in sequence at both ends of the hole 13, and are locked by using bolts to form a sealed gas storage model.

[0042] By installing the loading plate 17, connecting the related circuits of the hydraulic loading system 3, the air charging and discharging system and the like, the cyclic charging and discharging test can be carried out. The test process monitors the temperature and pressure changes and the deformation of the surrounding rock 1 and the like. The above is a compressed air energy storage simulation test under one scheme. When carrying out comparative tests of different sealing structures, multiple models of the internal rock mass 12 need to be prepared, and the lining 15 is poured according to different sealing materials and forms, and then the test is carried out to obtain monitoring data. By comparing and analyzing the monitoring data under multiple schemes, the feasibility of the scheme can be evaluated.

[0043] For example, two different sealing forms of the existing cavity compressed air energy storage comparative test are carried out. The external rock mass 11 of the test model is complete and hard rock, the front side length size is 1m, the thickness is 0.3m, and the internal rock mass 12 position with a length size of 0.6m is reserved in the center. The internal rock mass 12 is formed by pouring through a mold, and the pouring material is paid attention to similar proportioning to achieve the set performance of the surrounding rock 1. Different surrounding rocks 1 can be fundamentally formed by pouring with different material proportioning. The rock mass center reserved with the existing cavity position is formed by pouring, and the precast cracks are formed around the hole wall during pouring. The monitoring instrument 5 has been pre-buried. The cross section of the existing cavity is a city gate arch shape, the width is 0.25m, the height is 0.35m, the semicircular arch radius is 0.1m, and the cavity is 0.3m in the thickness direction. The sealing layer 14 material is 500MPa steel lining with a thickness of 1mm, and the elliptical and city gate shaped sealing structure forms are designed. Under the two sealing forms, the minimum distance between the steel lining and the hole wall is kept consistent.

[0044] After setting the size of the steel lining and the lining 15, the model is made, the steel lining is welded and shaped first, placed at the fixed position of the internal rock mass 12 and the mold, and then the concrete is poured at the aperture between the steel lining and the hole wall to form the lining 15, thereby completing the preparation of the test model. The test model is vertically hoisted and placed on the model base, the front and rear fixed plates 16 and the triangular fixed seat 19 are installed, the hydraulic loading system 3 is moved to the model, and the hydraulic head 31 is placed in the middle position of the loading plate 17.

[0045] The sealing plug 21, the restraint disc 22, the rigid rod 23 provided with a temperature frame and a pressure gauge, etc. of the gas storage part 2 are installed and locked by bolts to form a sealed chamber, only one gas delivery pipe column 41 is led out, the gas delivery pipe column 41 is connected with the air loading system air inlet pipe and air outlet pipe, the air inlet and outlet are controlled through valves, the monitoring system is installed, the related circuit is connected, and the test preparation work is completed.

[0046] When the comparative test under two sealing forms is carried out, the same air inlet temperature, pressure, rate and time are adopted, and the working condition is also kept constant when the air is discharged. The monitoring data of the gas storage during the circulation charging and discharging for 20 times is recorded, the pressure and temperature changes in the cavity are compared, and the differences in the gas storage performance under the two schemes are evaluated. The stress and strain conditions of the steel lining, the lining 15 and the surrounding rock 1 are compared, and the mechanical performance of the two sealing forms is evaluated. The above is only one comparative test proposed according to the test system of the utility model, and in addition to this, the comparative test of the sealing material, the surrounding rock 1 parameters, etc. can be changed.

[0047] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A physical model test system for cavern compressed air energy storage, characterized in that, The application relates to a physical model, a hydraulic loading system, an air circulation charging and discharging system and a monitoring system. The air circulation charging and discharging system comprises a gas feeding pipeline and a gas discharging pipeline, the gas feeding pipeline and the gas discharging pipeline are communicated with the hole through a gas feeding pipe column, the gas feeding pipeline can inject compressed air with a preset temperature and pressure into the hole, and the gas discharging pipeline can discharge the gas in the hole. The gas feeding pipeline comprises a pipeline-connected compressor, a heat exchanger, a first valve, a first flow meter and a pressure gauge; and the gas discharging pipeline comprises a pipeline-connected second valve and a second flow meter. The surrounding rock further comprises a sealing structure arranged on the inner wall of the inner rock block, the sealing structure comprises a sealing layer and a lining, the material of the sealing layer is at least one of a steel lining, rubber, glass fiber reinforced plastic and a coating, the lining is located between the inner rock block and the sealing layer, and the lining is formed by concrete backfilling.

2. The existing cavern compressed air energy storage physical model test system according to claim 1, characterized in that, The monitoring instrument comprises a pressure monitoring meter, a temperature monitoring meter, a steel plate stress meter, a lining strain meter, a surrounding rock joint meter and a surrounding rock strain meter, the pressure monitoring meter and the temperature monitoring meter are located at the middle position of the hole, the steel plate stress meter is arranged on the outer wall of the sealing layer, the lining strain meter is arranged in the lining, the surrounding rock joint meter is arranged at the prefabricated crack, the surrounding rock strain meter is arranged around the outer rock block, and the surrounding rock strain meter is arranged in a 45-degree angle distribution.

3. The existing cavern compressed air energy storage physical model test system according to claim 2, characterized in that, The outer rock block is in the shape of a cuboid, the cross section of the outer rock block is a square, the thickness of the outer rock block is smaller than the side length of the square, the cross section of the hole is in the shape of an arch, and the sealing layer is in the shape of an ellipse, a double circle or a gate shape.

4. The existing cavern compressed air energy storage physical model test system according to any one of claims 1-3, characterized in that, ​ 5. The existing cavern compressed air energy storage physical model test system according to claim 4, characterized in that, ​ 6. The existing cavern compressed air energy storage physical model test system according to claim 4, characterized in that, ​ 7. The existing cavern compressed air energy storage physical model test system according to claim 4, characterized in that, The physical model further comprises a fixed plate, a loading plate and a load-bearing base, the fixed plate is arranged on the opposite side of the outer rock mass along a first direction, the first direction is the axial direction of the inner rock mass, the load-bearing base is arranged at the bottom of the outer rock mass, and the fixed plate is fixedly connected with the load-bearing base; the number of the loading plates is plural, and the plural loading plates are respectively arranged at the top of the outer rock mass and the outer wall of the outer rock mass adjacent to one side of the fixed plate, and the loading plates are directly or indirectly connected with the hydraulic loading system and bear the load.

8. The existing cavern compressed air energy storage physical model test system according to claim 7, characterized in that, The gas storage part comprises sealing plugs, a constraint disc and a rigid rod, the sealing plugs are arranged on the two sides of the hole along the axial direction respectively, the constraint disc is arranged on the side away from each other of the sealing plugs, and the rigid rod passes through the hole and is connected with the sealing plugs and the constraint disc on both sides through bolts.

9. The existing cavern compressed air energy storage physical model test system according to claim 8, characterized in that, The fixed plate is provided with a through hole at the position corresponding to the hole, the sealing plug partially passes through the through hole and blocks the hole, a sealing ring is arranged between the sealing plug and the hole wall of the through hole, the constraint disc is located outside the fixed plate and abuts against the fixed plate, and a triangular fixing base is arranged between the load-bearing base and the fixed plate.

10. The existing cavern compressed air energy storage physical model test system according to any one of claims 1-3 or 5-9, characterized in that, The hydraulic loading system comprises a hydraulic head, a loading frame, a hydraulic power system and a computer, the hydraulic head is connected with the hydraulic power system and the computer through a line pipeline, one end of the hydraulic head abuts against the loading frame, and the other end abuts against the outer wall of the surrounding rock.

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