Compressed air energy storage lining chamber structure based on self-expansion film bag, material and construction method

Abstract

The invention provides a compressed air energy storage lining chamber structure based on a self-expansion film bag, a material and a construction method, and relates to the technical field of compressed air energy storage facilities. The pre-compression layer is arranged in the surrounding rock structure; the gas storage structure is arranged in the pre-pressure layer and is sequentially provided with a lining layer and a sealing layer from outside to inside, and a gas storage space used for storing gas is formed in the sealing layer; the radiation anchor rods are arranged on the outer side of the surrounding rock structure, evenly distributed in the circumferential direction and used for improving the overall strength of the surrounding rock structure. According to the method, the pre-compression layer composed of the modified bentonite film bags is additionally arranged between the concrete lining layer and the surrounding rock structure in a traditional structure of the compressed air energy storage lining chamber, the volume of bentonite is expanded when the bentonite encounters water to extrude the concrete lining layer, the effect of applying pre-compression to the concrete lining layer is achieved, and the risk that the lining layer cracks is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage facilities. Specifically, it particularly relates to a compressed air energy storage lining chamber structure, material, and construction method based on a self-expanding membrane bag. Background Art

[0002] During the low electricity consumption period, a compressed air energy storage power station uses surplus electric energy to drive an air compressor to store compressed air in a gas storage device. During the high electricity consumption period, the stored compressed air drives a generator to generate electricity, playing the role of peak shaving and valley filling and optimizing the power grid.

[0003] The compressed air energy storage lining chamber is one of the common gas storage devices, with the advantages of flexible site selection and low cost. Currently, the compressed air energy storage lining chamber is composed of a concrete lining, a sealing layer, and surrounding rock. Due to the continuous inflation and deflation of the chamber, the gas pressure in the chamber fluctuates dynamically, generating cyclic dynamic loads. The concrete lining layer of the chamber is always in a high internal pressure environment, resulting in the easy generation of cracks in the concrete lining, affecting the service life of the compressed air energy storage lining chamber.

[0004] Currently, the main measures for the cracking of the lining of the compressed air energy storage lining chamber are to optimize the lining structure. Patent Application No. 2023102678475 proposes a combined structure with alternating rigid lining sections and flexible lining sections; Patent Application No. 2024110983243 proposes a combined structure of lining joints, support beams, and rubber plugs. However, due to the splicing of special-shaped components and different material properties in the above-mentioned schemes, stress concentration is likely to occur in the component contact interface area, and there are deficiencies such as complex construction technology and low standardization degree of processes. More reasonable, convenient, and efficient methods are needed for actual construction.

[0005] Regarding the problems in the related technology, no effective solutions have been proposed yet. Summary of the Invention

[0006] In view of this, the present invention provides a compressed air energy storage lining chamber structure, material, and construction method based on a self-expanding membrane bag to solve the above-mentioned problems.

[0007] To solve the above problems, the specific technical solutions adopted by the present invention are as follows:

[0008] According to the first aspect of the present invention, there is provided a compressed air energy storage lining chamber structure based on a self-expanding membrane bag, including:

[0009] A surrounding rock structure having an accommodation space;

[0010] A pre-pressure layer provided inside the surrounding rock structure;

[0011] A gas storage structure is arranged inside the pre-pressure layer, and a lining layer and a sealing layer are sequentially arranged from outside to inside, and a gas storage space for storing gas is formed inside the sealing layer;

[0012] Radiation anchor bolts are arranged on the outer side of the surrounding rock structure and are evenly distributed circumferentially for enhancing the overall strength of the surrounding rock structure.

[0013] Furthermore, in order to utilize the volume expansion of bentonite when encountering water to extrude the concrete lining layer, so as to achieve the effect of applying pre-pressure to the concrete lining layer and reduce the risk of cracks in the lining layer, the pre-pressure layer is composed of a bentonite membrane bag laid on the surface of the surrounding rock structure and leaving a gap with the gas storage structure, and the bentonite membrane bag is used for absorbing water and expanding to fill the reserved gap; the bentonite membrane bag is fixedly connected with the surrounding rock structure through a plurality of anchor bolts, and the bentonite membrane bag is made of rubber material; the bentonite membrane bag is of a cuboid structure, and the four side edges of the bentonite membrane bag are of a foldable and stretchable structure, and a filling port is arranged at the top of the bentonite membrane bag; the foldable and stretchable structure is composed of wavy folds, and the fold direction extends along the expansion direction of the bentonite membrane bag, the folding depth of the foldable and stretchable structure is 2-3 times the original thickness of the bentonite membrane bag, the fold spacing is 5-10 mm, the folded part is made of rubber material, and the tensile strength of the folded part ≥ 10 MPa.

[0014] Furthermore, in order to enhance the overall strength of the surrounding rock structure 1 and significantly improve its ability to resist deformation, so as to provide a reliable surrounding rock support condition for the pre-pressure effect of the bentonite membrane bag, the length of the radiation anchor bolt is 3-5 m and the inclination angle is 15°-30°.

[0015] According to the second aspect of the present invention, a material for a compressed air energy storage lining chamber structure based on a self-expanding membrane bag is provided, and the material is composed of the following components:

[0016] Sodium-based bentonite, expansion regulator, structure stabilizer, cement, fly ash and alumina micro-powder.

[0017] The expansion regulator is a complex of inorganic salt and sodium gluconate, and is used for controlling the initial expansion rate and expansion amplitude of bentonite by controlling the cation concentration between bentonite layers.

[0018] The structure stabilizer is a modified fiber type and is used for inhibiting the propagation of micro-cracks during the expansion process.

[0019] The particle size of the alumina micro-powder is 0.3 μm-0.5 μm.

[0020] The preparation method of the material includes the following steps:

[0021] SⅠ. Determine the mixing ratio among sodium-based bentonite, expansion regulator, structure stabilizer, cement, fly ash, and alumina powder according to the preset target expansion performance and curing strength requirements.

[0022] SⅡ. After the sodium-based bentonite is naturally air-dried, it is successively crushed by a cage crusher, dried by a rotary dryer, and screened through a standard sieve.

[0023] SⅢ. Weigh sodium-based bentonite, expansion regulator, structure stabilizer, cement, fly ash, and alumina powder according to the mixing ratio, and fully roll and mix them evenly by a pan mixer to obtain a modified bentonite composite material.

[0024] According to the third aspect of the present invention, a construction method for a compressed air energy storage lining chamber structure based on a self-expanding membrane bag is provided. The construction method includes the following steps:

[0025] S1. Determine the surrounding rock stress and deformation conditions after the chamber excavation according to the geological data of the project site.

[0026] S2. Determine the initial design scheme of the underground compressed air energy storage chamber; according to the initial design scheme, determine the stress and deformation conditions of the lining under the conditions of non-gas storage, gas filling, gas storage, gas discharge, and secondary gas storage in the initial underground energy storage chamber.

[0027] S3. Determine the construction scheme of the pre-pressure layer according to the stress and deformation conditions of the lining; the content of the pre-pressure layer construction scheme includes: parameters of the bentonite membrane bag, laying method of the bentonite membrane bag, reserved gap width between the pre-pressure layer and the lining layer, and water injection volume.

[0028] The parameters of the bentonite membrane bag include: composition and ratio of the modified bentonite composite material in the membrane bag, number of membrane bags, and membrane bag specifications.

[0029] S4. Carry out underground chamber excavation support and base surface treatment according to the initial design scheme of the underground compressed air energy storage chamber.

[0030] S5. Lay the bentonite membrane bag according to the construction scheme of the pre-pressure layer.

[0031] S6. Install and pour the formwork, fix the pouring formwork by a support frame system, carry out concrete lining construction according to the construction conditions, and reserve a water injection port; after the concrete lining is poured, carry out standard curing until the preset strength requirement is reached.

[0032] S7. Inject an aqueous solution into the water injection port, and stop injecting after the injected solution reaches the designed required amount. Wait for the bentonite to expand to generate the designed required pre-pressure and complete curing, and permanently seal the water injection port with concrete to complete the construction of applying the pre-pressure.

[0033] The beneficial effects of the present invention are as follows:

[0034] 1. In the present invention, a pre-pressure layer composed of a modified bentonite membrane bag is added between the concrete lining layer and the surrounding rock structure in the traditional structure of the compressed air energy storage inner lining chamber. The bentonite expands in volume when encountering water and squeezes the concrete lining layer, so as to achieve the effect of applying pre-pressure to the concrete lining layer and reduce the risk of cracks in the lining layer.

[0035] 2. The modified bentonite composite material provided by the present invention has simple components, wide raw material sources, and good chemical stability of the materials used, with less impact on the environment.

[0036] 3. The construction method proposed by the present invention reasonably utilizes the expansion and time-varying characteristics of the modified bentonite composite material. The process is simple, high-strength prestress can be applied to the concrete lining, and the long-term stability of the prestress is ensured, thus effectively guaranteeing the overall stability and service performance of the underground compressed air energy storage inner lining chamber structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. In the drawings:

[0038] Figure 1 is a cross-sectional schematic view of a compressed air energy storage inner lining chamber structure based on a self-expanding membrane bag according to an embodiment of the present invention;

[0039] Figure 2 is a structural schematic view of a compressed air energy storage inner lining chamber structure based on a self-expanding membrane bag according to an embodiment of the present invention

[0040] Figure 3 is an anchoring schematic view of a bentonite membrane bag in a compressed air energy storage inner lining chamber structure based on a self-expanding membrane bag according to an embodiment of the present invention;

[0041] Figure 4 is a preparation flow chart of a modified bentonite composite material in a compressed air energy storage inner lining chamber structure based on a self-expanding membrane bag according to an embodiment of the present invention;

[0042] Figure 5 is a flow chart of a construction method of a compressed air energy storage inner lining chamber structure based on a self-expanding membrane bag according to an embodiment of the present invention.

[0043] In the figure:

[0044] 1. Surrounding rock structure; 2. Pre-pressure layer; 21. Bentonite film bag; 211. Foldable and stretchable structure; 212. Filling port; 213. Anchor bolt hole; 214. Anchor bolt; 3. Lining layer; 4. Sealing layer; 5. Gas storage space; 6. Radiation anchor bolt. Detailed implementation manners

[0045] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0046] According to an embodiment of the present invention, a compressed air energy storage lining chamber structure, material and construction method based on a self-expanding film bag are provided.

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation manners. As Figures 1 - 3 shown, according to the first embodiment of the present invention, a compressed air energy storage lining chamber structure based on a self-expanding film bag is provided, including:

[0048] A surrounding rock structure 1 with an accommodation space;

[0049] A pre-pressure layer 2 provided inside the surrounding rock structure 1;

[0050] A gas storage structure provided inside the pre-pressure layer 2, and a lining layer 3 and a sealing layer 4 are sequentially arranged from outside to inside, and a gas storage space 5 for storing gas is formed inside the sealing layer 4;

[0051] Specifically, the gas storage structure is located in the accommodation space, the sealing layer 4 has a gas storage space for storing compressed gas; the lining layer 3 is a concrete lining, and a number of openings are preset on its surface.

[0052] It should be noted that the bentonite film bag 21 has the property of swelling when absorbing water. After the construction of the lining layer 3 is completed, an aqueous solution is injected into the bentonite film bag 21 through the openings preset in the lining layer 3. The bentonite film bag 21 absorbs water and swells and gradually fills the reserved gap. By controlling the water injection rate, the bentonite film bag 21 is allowed to expand until it completely fills the gap and then continues to expand, so as to apply a uniform pre-pressure to the concrete lining layer 3. This method can effectively reduce the tensile stress generated in the lining layer 3 during the air filling process of the underground compressed air energy storage chamber, inhibit or avoid the generation of cracks in the lining layer, and significantly improve the structural stability and service life of the underground compressed air energy storage chamber.

[0053] The radial anchor bolts 6 are arranged on the outer side of the surrounding rock structure 1 and are evenly distributed circumferentially, and are used to enhance the overall strength of the surrounding rock structure 1.

[0054] In one embodiment, for the above-mentioned pre-pressure layer 2, the pre-pressure layer 2 is composed of a bentonite film bag 21 laid on the surface of the surrounding rock structure 1 and reserved with a gap between the gas storage structure. The bentonite film bag 21 is used to absorb water and expand to fill the reserved gap; the bentonite film bag 21 is fixedly connected to the surrounding rock structure 1 through a plurality of anchor bolts 214 to ensure the stability of the bentonite film bag 21 during the expansion process, and the bentonite film bag 21 is made of rubber material; the bentonite film bag 21 is a cuboid structure, and the four side edges of the bentonite film bag 21 are foldable and stretchable structures 211. A filling port 212 is opened at the top of the bentonite film bag 21; the foldable and stretchable structure 211 is composed of wavy folds, and the folding direction extends along the expansion direction of the bentonite film bag 21. The folding depth of the foldable and stretchable structure 211 is 2-3 times the original thickness of the bentonite film bag 21, the folding pitch is 5-10 mm, the folded part is made of rubber material, and the tensile strength of the folded part is ≥10 MPa, so that the bentonite can be used to expand in volume when encountering water to squeeze the concrete lining layer, so as to achieve the effect of applying pre-pressure to the concrete lining layer and reduce the risk of cracks in the lining layer.

[0055] It should be noted that the bentonite film bag 21 is used to unidirectionally extend when absorbing water and expanding to uniformly apply pre-pressure. The filling port 212 on the bentonite film bag 21 is used to inject an aqueous solution; the characteristic of the bentonite film bag 21 absorbing water and expanding is used to squeeze the concrete lining to achieve the effect of applying pre-pressure, thereby reducing the risk of cracking of the lining layer and improving the service life of the underground energy storage chamber.

[0056] Specifically, when the bentonite film bag 21 absorbs water, the modified bentonite composite material inside it undergoes a hydration reaction and generates expansion deformation, so as to apply a uniform radial pre-pressure to the concrete lining layer 3. At the same time, cement and fly ash in the composite material undergo a curing reaction during the hydration process, so that the bentonite forms a certain structural strength in the later stage. By precisely controlling the expansion characteristics of the bentonite film bag 21, an effective pre-pressing effect on the concrete lining is realized, and the overall mechanical properties and long-term stability of the structure are significantly improved.

[0057] In one embodiment, for the above-mentioned radial anchor bolts 6, the length of the radial anchor bolts 6 is 3-5 m, and the inclination angle is 15°-30°, so as to enhance the overall strength of the surrounding rock structure 1 and significantly improve its ability to resist deformation, thereby providing reliable surrounding rock support conditions for the pre-pressing effect of the bentonite film bag 21.

[0058] According to the second embodiment of the present invention, a material for a compressed air energy storage lining chamber structure based on a self-expanding film bag is provided, and the material is composed of the following components:

[0059] Sodium bentonite, expansion regulator, structure stabilizer, cement, fly ash and alumina micropowder.

[0060] The expansion regulator is a complex of inorganic salt and sodium gluconate, and is used to control the initial expansion rate and expansion amplitude of bentonite by controlling the cation concentration between the bentonite layers.

[0061] The structure stabilizer is a modified fiber type, and is used to inhibit the propagation of microcracks during the expansion process.

[0062] The particle size of the alumina micropowder is 0.3μm - 0.5μm.

[0063] Specifically, the expansion regulator is composed of a complex of inorganic salt and sodium gluconate, and controls the initial expansion rate and expansion amplitude of bentonite by controlling the cation concentration between the bentonite layers, while delaying the cement hydration process to ensure that expansion takes precedence over curing in the early stage of the reaction.

[0064] The structure stabilizer being a modified fiber type can inhibit the propagation of microcracks during the expansion process and maintain the structural stability during the expansion and curing stage.

[0065] Cement and fly ash have the functions of setting and hardening, and strengthen the strength after the expansion of bentonite.

[0066] The alumina micropowder, as a rigid particle, can be used as a filler to fill between the bentonite particles and the cement particles, and react with the cement hydration product (Ca(OH)2) to form (C-A-H), and cooperate with the micro-aggregate effect of fly ash to achieve double pore filling, so as to improve the compressive strength after curing.

[0067] Through the coordinated action of the above components, it can ensure that the modified bentonite first expands uniformly and then hardens and solidifies after contacting with the aqueous solution. To achieve the effect of applying pre-pressure to the extruded concrete.

[0068] As Figure 4 shown, the preparation method of the material includes the following steps:

[0069] SⅠ. According to the preset target expansion performance and curing strength requirements, determine the mixing ratio among sodium bentonite, expansion regulator, structure stabilizer, cement, fly ash and alumina micropowder;

[0070] SⅡ. After the sodium bentonite is naturally air-dried, it is successively crushed by a cage crusher, dried by a rotary dryer, and screened by a standard sieve;

[0071] SIII. Weigh sodium bentonite, expansion control agent, structural stabilizer, cement, fly ash and alumina powder according to the proportion, and use a wheel mixer to fully roll and mix until uniform, to obtain a modified bentonite composite material.

[0072] The properties of the modified bentonite composite material of the present invention will be described below through specific examples.

[0073] Example 1

[0074] According to the material preparation steps, sodium bentonite (86%), cement (8%), fly ash (3%), expansion regulator (1.6%), structural stabilizer (1%), and alumina powder (0.4%) were prepared to make a modified bentonite composite material; the sample was divided into three equal parts and filled layer by layer into a cylindrical mold with an inner diameter of 50mm. After each layer was compacted to a preset height, the hair was scraped and layered. After the three-layer compaction process was completed, the mold was demolded to finally obtain a standard cylindrical sample with a height of 100±0.5mm (compaction degree 95%). The sample was fixed on a rotating table and sprayed uniformly in the radial direction using an atomizing spray gun at a distance of 200mm and a water spray rate of 0.3L / h. The sample weight was monitored by weighing until the final moisture content was reached, and then sealed and cured (25℃, humidity ≥95%, 7 days). The sample was tested for expansion force and compressive strength after curing.

[0075] Example 2

[0076] A modified bentonite composite material was prepared using sodium bentonite (89%), cement (6%), fly ash (2%), an expansion modifier (1.6%), a structural stabilizer (1%), and alumina powder (0.4%) according to the aforementioned preparation steps. Cylindrical specimens (95% compaction) with a diameter of 50 mm and a height of 100 mm ± 0.5 mm were prepared using the same process as in Example 1. The specimens were then adjusted to the target moisture content and sealed for curing (25°C, humidity ≥ 95%, 7 days) according to the method in Example 1. The specimens were then tested for expansion force and compressive strength after curing.

[0077] Example 3

[0078] A modified bentonite composite material was prepared using sodium bentonite (85%), cement (6%), fly ash (5%), an expansion modifier (2.6%), a structural stabilizer (1%), and alumina powder (0.4%) according to the aforementioned preparation steps. Cylindrical specimens (95% compaction) with a diameter of 50 mm and a height of 100 mm ± 0.5 mm were prepared using the same process as in Example 1. The specimens were then adjusted to the target moisture content and sealed for curing (25°C, humidity ≥ 95%, 7 days). The specimens were tested for expansion force and compressive strength after curing.

[0079] For the above three embodiments, the summary results of the swelling force and the compressive strength after curing are shown in Table 1;

[0080] Table 1 Summary Results of Swelling Force and Compressive Strength after Curing

[0081] Item Example 1 Example 2 Example 3 Expansion force (MPa) 3.14 3.54 2.93 Curing compressive strength (MPa) 2.89 2.43 2.78

[0082] As Figure 5 shown, according to the third embodiment of the present invention, a construction method for a compressed air energy storage lining chamber structure based on a self-expanding film bag is provided. The construction method includes the following steps:

[0083] S1. According to the geological data of the engineering site, determine the surrounding rock stress and deformation conditions after the chamber excavation;

[0084] It should be noted that the surrounding rock stress and deformation conditions after the chamber excavation can be realized by numerical software such as ANSYS. Since this part belongs to the prior art, it will not be elaborated here.

[0085] S2. Determine the initial design scheme of the underground compressed air energy storage chamber; according to the initial design scheme, determine the stress and deformation conditions of the lining under the conditions of no gas storage, gas filling, gas storage, gas release, and secondary gas storage in the initial underground energy storage chamber;

[0086] Specifically, the surrounding rock stress and deformation conditions of the initial underground compressed air energy storage chamber under various working conditions can be analyzed by numerical software such as ANSYS or other existing methods.

[0087] S3. According to the stress and deformation conditions of the lining, determine the construction scheme of the pre-pressure layer 2; the content of the construction scheme of the pre-pressure layer 2 includes: the parameters of the bentonite film bag 21, the laying method of the bentonite film bag 21, the reserved gap width between the pre-pressure layer 2 and the lining layer 3, and the water injection volume;

[0088] The parameters of the bentonite film bag 21 include: the composition and ratio of the modified bentonite composite material in the film bag, the number of film bags, and the film bag specifications;

[0089] S4. According to the initial design scheme of the underground compressed air energy storage chamber, carry out underground chamber excavation support and base surface treatment;

[0090] It should be noted that according to the initial design scheme of the underground compressed air energy storage chamber, an appropriate excavation method is adopted, and at the same time, the radiation anchor bolts 6 are used for reinforcement support; the loose materials such as floating stones and mud on the chamber wall surface are removed; and shotcrete treatment is carried out; according to the design scheme, the anchor bolt holes 213 are reserved, and waterproof materials are laid on the formed base surface.

[0091] S5. Lay the bentonite film bag 21 according to the construction scheme of the pre-pressure layer 2;

[0092] It should be noted that the bentonite membrane bag 21 is laid according to the design scheme, anchor bolts 214 are arranged on the bottom surface of the membrane bag according to the design requirements, holes are drilled on the chamber wall surface and the anchor bolts 214 are inserted to fix the membrane bag. Special adhesive is evenly applied at the joints of the membrane bag and compacted to ensure the joints are tight. After the membrane bag is laid, a waterproof material is covered on the surface to ensure the continuity and integrity of the overall waterproof system.

[0093] S6. Install the casting formwork and fix the casting formwork with a support frame system. Carry out the concrete lining construction according to the construction conditions and reserve a water injection port. After the concrete lining is poured, carry out standard curing until the preset strength requirement is met.

[0094] It should be noted that according to the design requirements, the casting formwork is installed at a specified position above the surface of the waterproof material, and the formwork is fixed with a support frame system. Select a suitable casting process for concrete construction according to the working conditions and reserve a water injection port at an appropriate position. After the concrete lining is poured, carry out standard curing until the design strength requirement is met.

[0095] S7. Inject an aqueous solution into the water injection port, and stop injecting after the injected solution reaches the designed required amount. Wait for the bentonite to expand to generate the designed required pre-pressure and complete curing, and permanently seal the water injection port with concrete to complete the construction of applying the pre-pressure.

[0096] In summary, by means of the above technical solutions of the present invention, a pre-pressure layer composed of a modified bentonite membrane bag is added between the concrete lining layer and the surrounding rock structure in the traditional structure of the compressed air energy storage inner lining chamber of the present invention. The bentonite expands in volume when encountering water and extrudes the concrete lining layer to achieve the effect of applying pre-pressure to the concrete lining layer and reducing the risk of cracks in the lining layer. The modified bentonite composite material provided by the present invention has simple components, wide raw material sources, good chemical stability of the used materials, and less impact on the environment. The construction method proposed by the present invention reasonably utilizes the expansion and time-varying characteristics of the modified bentonite composite material, has a simple process, realizes the application of high-strength prestress to the concrete lining, and ensures the long-term stability of the prestress, thereby effectively ensuring the overall stability and service performance of the underground compressed air energy storage inner lining chamber structure.

[0097] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A compressed air energy storage lining chamber structure based on a self-expanding membrane bag, characterized in that Comprising: A surrounding rock structure with an accommodation space; A pre-pressure layer disposed inside the surrounding rock structure; A gas storage structure disposed inside the pre-pressure layer, with a lining layer and a sealing layer arranged in sequence from outside to inside, and a gas storage space for storing gas formed inside the sealing layer; Radiation anchor bolts disposed outside the surrounding rock structure and evenly distributed circumferentially, for enhancing the overall strength of the surrounding rock structure.

2. The compressed air energy storage inner chamber structure based on the self-expanding film bag according to claim 1, wherein, The pre-pressure layer is composed of a bentonite membrane bag laid on the surface of the surrounding rock structure and having a gap reserved between it and the gas storage structure, and the bentonite membrane bag is used for absorbing water and swelling to fill the reserved gap; The bentonite membrane bag is fixedly connected to the surrounding rock structure through a plurality of anchor bolts, and the bentonite membrane bag is made of rubber material.

3. The compressed air energy storage lining chamber structure based on a self-expanding membrane bag according to claim 1, characterized in that, The bentonite membrane bag is of a cuboid structure, and the four side edges of the bentonite membrane bag are of a foldable and stretchable structure, and a filling port is provided at the top end of the bentonite membrane bag; The foldable and stretchable structure is composed of wavy folds, and the folding direction extends along the swelling direction of the bentonite membrane bag. The folding depth of the foldable and stretchable structure is 2-3 times the original thickness of the bentonite membrane bag, the folding spacing is 5-10 mm, the folded part is made of rubber material, and the tensile strength of the folded part is ≥10 MPa.

4. A compressed air energy storage lining chamber structure based on a self-expanding film bag according to claim 3, characterized in that, The length of the radiation anchor bolt is 3-5 m, and the inclination angle is 15°-30°.

5. A material for a compressed air energy storage inner lining chamber structure based on a self-expanding membrane bag, which is used to fill the compressed air energy storage inner lining chamber structure based on the self-expanding membrane bag described in any one of claims 1-4, characterized in that, This material is composed of the following components: Sodium-based bentonite, swelling regulator, structure stabilizer, cement, fly ash and alumina micro-powder.

6. The material of a compressed air energy storage inner lining chamber structure based on a self-expanding film bag according to claim 5, characterized in that, The swelling regulator is a composite of inorganic salts and sodium gluconate, and is used for controlling the initial swelling rate and swelling amplitude of bentonite by controlling the cation concentration between bentonite layers.

7. The material of a compressed air energy storage lining chamber structure based on a self-expanding film bag according to claim 6, characterized in that, The structure stabilizer is a modified fiber type, and is used for inhibiting the propagation of micro-cracks during the swelling process.

8. The material of a compressed air energy storage lining chamber structure based on a self-expanding film bag according to claim 6, characterized in that, The particle size of the alumina micro-powder is 0.3 μm - 0.5 μm.

9. The material of a compressed air energy storage lining chamber structure based on a self-expanding membrane bag according to claim 6, characterized in that, The preparation method of this material includes the following steps: SⅠ. According to the preset target swelling performance and curing strength requirements, determine the mixing ratio between sodium-based bentonite, swelling regulator, structure stabilizer, cement, fly ash and alumina micro-powder; SⅡ. After the sodium-based bentonite is naturally air-dried, it is successively crushed by a cage crusher, dried by a rotary dryer, and screened by a standard sieve; SⅢ. Weigh sodium-based bentonite, swelling regulator, structure stabilizer, cement, fly ash and alumina micro-powder according to the mixing ratio, and fully roll and mix them evenly by a roller mill to obtain a modified bentonite composite material.

10. A construction method for a compressed air energy storage inner lining chamber structure based on a self-expanding membrane bag, which is used to implement the construction of the compressed air energy storage inner lining chamber structure based on a self-expanding membrane bag described in any one of claims 1-4, characterized in that, This construction method includes the following steps: S1. According to the geological data of the engineering site, determine the surrounding rock stress and deformation conditions after the chamber excavation; S2. Determine the initial design scheme of the underground compressed air energy storage chamber; according to the initial design scheme, determine the stress and deformation conditions of the lining under the conditions of non-gas storage, gas filling, gas storage, gas discharge and secondary gas storage of the initial underground energy storage chamber; S3. According to the stress and deformation conditions of the lining, determine the construction scheme of the pre-pressure layer; the content of the pre-pressure layer construction scheme includes: parameters of the bentonite membrane bag, laying method of the bentonite membrane bag, reserved gap width between the pre-pressure layer and the lining layer, and water injection volume. The parameters of the bentonite membrane bag include: the composition and ratio of the modified bentonite composite material in the membrane bag, the number of membrane bags, and the membrane bag specifications; S4. According to the initial design scheme of the underground compressed air energy storage chamber, carry out the excavation support and base surface treatment of the underground chamber; S5. Lay the bentonite membrane bag according to the construction scheme of the pre-pressure layer; S6. Install the casting formwork, and use the support frame system to fix the casting formwork. Carry out the concrete lining construction according to the construction conditions, and reserve the water injection port; after the concrete lining is poured, carry out standard curing until the preset strength requirement is reached; S7. Inject the aqueous solution into the water injection port, and stop injecting after the injected solution reaches the designed required amount. Wait for the bentonite to expand to generate the designed required pre-pressure and complete curing, and permanently seal the water injection port with concrete to complete the construction of applying the pre-pressure.

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