Gas storage cavern sealing structure and underground artificial gas storage cavern

Abstract

This application relates to a gas storage cavern sealing structure and an underground artificial gas storage cavern. The gas storage cavern sealing structure of this application includes a vertical shaft, a connecting channel, and a sealing body. The top of the vertical shaft is used to install at the bottom of the underground artificial gas storage cavern. The bottom of the vertical shaft connects to the connecting channel, which is used for construction of the vertical shaft. The sealing body is installed in the vertical shaft and the connecting channel, with one end of the sealing body near the bottom of the underground artificial gas storage cavern abutting against the bottom of the cavern. Specifically, the bottom of the connecting channel is bedrock, and the sealing body provides resistance to frontal compression through the bedrock of the connecting channel. The gas storage cavern sealing structure and the underground artificial gas storage cavern of this application have the advantages of small engineering volume and low cost.

Description

Technical Field

[0001] This application relates to the field of underground cavern structure technology, and in particular to a gas storage cavern sealing structure and an underground artificial gas storage cavern. Background Technology

[0002] Underground artificial gas storage caverns are used to store compressed air. The cavern sealing structure is the core component for achieving a safe seal in underground artificial gas storage caverns. The quality of the cavern sealing structure design directly determines the pressure-bearing stability and long-term airtight reliability of the underground artificial gas storage caverns.

[0003] Traditional cavern sealing structures often employ monolithic concrete structures arranged on the sides of underground artificial gas storage caverns. They rely on the structure's own weight, the friction of the surrounding rock contact surface, and the external grouting curtain to jointly resist the internal gas pressure load. As the operating pressure of underground artificial gas storage caverns continues to increase, the design length of the cavern sealing structure increases significantly with the increase in internal pressure. When the design pressure of underground artificial gas storage caverns reaches 12MPa~18MPa, according to relevant formulas, the length of traditional cavern sealing structures can reach hundreds of meters, resulting in a significant increase in project scale and construction costs, making it difficult to meet the requirements of high-pressure gas storage conditions. Summary of the Invention

[0004] Therefore, it is necessary to provide a gas storage cavern sealing structure and an underground artificial gas storage cavern to address the problems of large engineering volume and high cost of cavern sealing structures.

[0005] This invention provides a gas storage cavity sealing structure, comprising: A vertical shaft, the top of which is used to be located at the bottom of an underground artificial gas storage chamber; A connecting channel is provided, the bottom end of which is connected to the connecting channel, which is used for construction of the shaft; A sealing body is provided in the vertical shaft and the connecting passage, and one end of the sealing body near the underground artificial gas storage chamber is used to abut against the bottom of the underground artificial gas storage chamber.

[0006] In one embodiment, the sealing body includes a first concrete and a second concrete, the first concrete being disposed in the shaft, and the second concrete being disposed at one end of the connecting channel connecting to the shaft, the first concrete and the second concrete being connected.

[0007] In one embodiment, the first concrete is configured as a frustum structure and the second concrete is configured as a cuboid structure.

[0008] In one embodiment, the area of ​​the end face of the second concrete away from the underground artificial gas storage chamber is S1, and the area of ​​the end face of the first concrete facing the underground artificial gas storage chamber is S2, with S1 set to be 2 to 2.5 times S2.

[0009] In one embodiment, both the first concrete and the second concrete are plain concrete with an expansion agent added.

[0010] In one embodiment, the sealing body is provided with a maintenance passage, one end of which is connected to the underground artificial gas storage chamber, and the other end of which is connected to the connecting passage.

[0011] In one embodiment, the length L1 of the vertical shaft is set to 1 to 2 times the diameter D of the underground artificial gas storage cavern, and the length L1 of the vertical shaft is greater than or equal to 10m; the length L2 of the entrance of the connecting channel from the sealing body is set to 1 to 2 times the diameter D of the underground artificial gas storage cavern, and the length L2 of the vertical shaft is greater than or equal to 10m.

[0012] In one embodiment, the inner wall of the shaft is provided with an anchor spray layer, and the gap between the sealing body and the anchor spray layer is filled by pressure grouting.

[0013] In one embodiment, the inner wall of the connecting channel is provided with a lining layer.

[0014] The present invention also provides an underground artificial gas storage cavern, which is used in conjunction with the gas storage cavern sealing structure of the above embodiments. It includes a support layer and a sealing layer. The support layer is used to be set on the surface of the surrounding rock, and the sealing layer is set on the surface of the support layer away from the surrounding rock. The inner circumferential surface of the sealing layer forms a storage cavity, and the gas storage cavern sealing structure is set at the bottom of the support layer.

[0015] The aforementioned gas storage cavern sealing structure and underground artificial gas storage cavern, the latter being a sunken cavern sealing structure formed by setting a sealing structure at the bottom. The top of the sealing body of the gas storage cavern sealing structure abuts against the bottom of the underground artificial gas storage cavern for pressure bearing, while the bottom end of the sealing body is inserted into the bottom surface of the connecting channel. The sealing body can replace the natural surrounding rock at the bottom of the underground artificial gas storage cavern, possessing superior structural integrity and load-bearing capacity, which is beneficial to improving the stability of the cavern. Furthermore, the deformation of the pressure-bearing structure of the sealing body is small, reducing the amount of support work during construction. On the other hand, the bedrock at the bottom of the sealing body provides sufficient frontal resistance, significantly improving the compressive bearing capacity of the sealing body, thereby greatly reducing the design length of the sealing body, effectively reducing the project volume, shortening the construction period, and improving the safety and stability of the gas storage cavern sealing structure. Attached Figure Description

[0016] Figure 1 This is a front view schematic diagram of the gas storage cavern sealing structure and the underground artificial gas storage cavern described in the embodiments of this application.

[0017] Figure 2 This is a side view of the gas storage cavern sealing structure and the underground artificial gas storage cavern described in the embodiments of this application.

[0018] Figure 3 This is a top view schematic diagram of the gas storage cavern sealing structure and the underground artificial gas storage cavern described in the embodiments of this application.

[0019] Icon labels: 100. Shaft; 110. Anchor spray layer; 200. Connecting channel; 210. Lining layer 300. Sealing body; 310. First concrete; 320. Second concrete; 330. Inspection passage; 340. Ladder; 350. Sealing door; 10. Gas storage cavern sealing structure; 20. Underground artificial gas storage cavern; 21. Support layer; 22. Sealing layer; 23. Storage cavity. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0021] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0026] See Figures 1 to 3 The diagram shows a schematic diagram of a gas storage cavern sealing structure in one embodiment of this application. The gas storage cavern sealing structure 10 includes a vertical shaft 100, a connecting channel 200, and a sealing body 300. The top of the vertical shaft 100 is used to be installed at the bottom of the underground artificial gas storage cavern 20.

[0027] The bottom end of the shaft 100 is connected to the connecting channel 200, which is used for construction of the shaft 100.

[0028] A sealing body 300 is installed in the shaft 100 and the connecting passage 200. The end of the sealing body 300 near the underground artificial gas storage chamber 20 is used to abut against the bottom of the underground artificial gas storage chamber 20. Specifically, the upper part of the sealing body 300 is located in the shaft 100, and the lower part of the sealing body 300 is inserted into the connecting passage 200. The bottom of the connecting passage 200 is bedrock, and the sealing body 300 provides resistance to frontal pressure through the bedrock of the connecting passage 200.

[0029] It should be noted that the underground artificial gas storage high-pressure cavern described in this application embodiment refers to an underground artificial gas storage cavern with an upper limit working pressure of not less than 8 MPa. Further, the high pressure refers to a working pressure in the range of 8~18 MPa. Of course, the structure of the underground artificial gas storage high-pressure cavern described in this application embodiment can also be applied to low-pressure cavern structures for gas storage; this application is not limited to this.

[0030] The gas storage cavern sealing structure 10 described in this embodiment is installed at the bottom of the underground artificial gas storage cavern 20, forming a sunken cavern sealing structure. During the construction phase of the gas storage cavern sealing structure 10, a connecting channel 200 is excavated from the ground to a position below the underground artificial gas storage cavern 20, and then a vertical shaft 100 is excavated from bottom to top to the bottom of the underground artificial gas storage cavern 20, so that the vertical shaft 100 connects the bottom of the underground artificial gas storage cavern 20 with the connecting channel 200. The connecting channel 200 has sufficient space, which facilitates equipment transportation and slag removal, effectively improving on-site construction conditions. The sealing body 300 is installed in the vertical shaft 100, with the top of the sealing body 300 abutting against the bottom of the underground artificial gas storage cavern 20 to bear pressure, and the bottom of the sealing body 300 abutting against the bottom surface of the connecting channel 200. Compared with the traditional lateral sealing body 300, since the bottom surface of the gas storage cavern sealing structure 10 is infinite bedrock, the deformation of the pressure-bearing structure of the sealing body 300 is smaller, and there is no collapse or falling block in the pressure-bearing structure at the bottom. Therefore, the requirements for support during the construction of the sealing body 300 are lower, which reduces the amount of support construction work to a certain extent.

[0031] The gas storage cavern sealing structure 10 described in this application embodiment, with its sealing body 300, can replace the natural surrounding rock at the bottom of the underground artificial gas storage cavern 20. It possesses superior structural integrity and load-bearing capacity, which is beneficial for improving the stability of the cavern. Furthermore, the pressure-bearing structure of the sealing body 300 exhibits minimal deformation, reducing the amount of support work required during construction. On the other hand, the bedrock at the bottom of the sealing body 300 provides sufficient frontal resistance, significantly improving its compressive bearing capacity. This drastically reduces the design length of the sealing body 300, effectively decreasing the project volume, shortening the construction period, and enhancing the safety and stability of the gas storage cavern sealing structure 10.

[0032] In one exemplary embodiment, such as Figure 1 As shown, the vertical shaft 100 extends vertically, the connecting channel 200 extends horizontally, and the bottom end of the vertical shaft 100 is vertically connected to the end of the connecting channel 200.

[0033] In an exemplary embodiment, before construction, the range of the plastic zone of the surrounding rock is obtained by finite element analysis based on the properties of the surrounding rock of the underground artificial gas storage cavern 20, so that the connecting channel 200 avoids the range of the plastic zone of the underground artificial gas storage cavern 20.

[0034] In some embodiments, such as Figure 1 and Figure 3 As shown, the sealing body 300 includes a first concrete 310 and a second concrete 320. The first concrete 310 is disposed in the shaft 100, and the second concrete 320 is disposed at one end of the connecting channel 200 that connects to the shaft 100. The first concrete 310 and the second concrete 320 are connected.

[0035] In this embodiment, the sealing body 300 is composed of a first concrete 310 disposed in the vertical shaft 100 and a second concrete 320 disposed in the connecting channel 200, forming a complete pressure-bearing and sealing structure spanning the vertical shaft 100 and the connecting channel 200. It can be adapted to the cross-sectional shape and construction space of the vertical shaft 100 and the connecting channel 200 respectively, ensuring that the sealing body 300 is fully and tightly attached to the surrounding rock, and effectively improving the overall working reliability of the sealing body 300.

[0036] In an optional embodiment, such as Figure 1 and Figure 3 As shown, the first concrete 310 is a frustum structure, and the second concrete 320 is a cuboid structure. Similarly, the shaft 100 is a frustum structure, and the end of the connecting channel 200 that connects to the shaft 100 has a rectangular cross-section.

[0037] In this embodiment, the sealing body 300 is composed of a frustum structure and a cuboid structure, forming a variable cross-section configuration with a smaller upper section and a larger lower section, and a rounder upper section and a smaller lower section. The upper frustum structure is adapted to the circular cross-section of the vertical shaft 100, while the lower cuboid structure matches the rectangular cross-section of the connecting channel 200. The smooth connection between the two ensures that the sealing body 300 is in close contact with the surrounding rock across the entire cross-section. The structure with a smaller upper section and a larger lower section can create a stepwise stress diffusion effect on the concentrated gas pressure load transmitted from the underground artificial gas storage cavern 20, gradually transmitting and diffusing the axial high-pressure load to the surrounding and lower bedrock, effectively alleviating the stress concentration problem at the junction of the structural ends of the sealing body 300 and the surrounding rock, strengthening the load-bearing capacity of the sealing body 300, and improving the stability of the gas storage cavern sealing structure 10.

[0038] In one exemplary embodiment, such as Figure 1 and Figure 3 As shown, the bottom diameter of the frustum structure of the first concrete 310 is equal to the top side length of the cuboid structure of the second concrete 320, which allows the connection surfaces of the first concrete 310 and the second concrete 320 to correspond completely and transition smoothly, ensuring that the sealing body 300 is subjected to continuous and uniform stress, and ensuring the continuity of stress diffusion under high pressure load.

[0039] In an optional embodiment, such as Figure 3 As shown, the area of ​​the end face of the second concrete 320 away from the underground artificial gas storage chamber 20 is S1, and the area of ​​the end face of the first concrete 310 facing the underground artificial gas storage chamber 20 is S2. S1 is set to be 2 to 2.5 times S2.

[0040] In this embodiment, the bottom area S1 of the second concrete 320 is set to be 2 to 2.5 times the area S2 of the first concrete 310 connecting the underground artificial gas storage chamber 20. Combined with the gradually changing pressure-bearing structure of the sealing body 300, which is smaller at the top and larger at the bottom, the stress diffusion effect of the vertical load can be further enhanced. After the concentrated gas pressure load transmitted by the upper underground artificial gas storage chamber 20 is gradually diffused and depressurized by the structure, the pressure transmitted to the bottom bedrock of the sealing body 300 is only 0.4 to 0.5 times that of the pressure of the underground artificial gas storage chamber 20. This effectively reduces the compressive strength requirements of the bottom pressure-bearing structure of the sealing body 300 under high-pressure conditions. It can reduce the amount of high-performance pressure-bearing concrete used, control the construction cost, optimize the stress distribution of the bottom bedrock of the sealing body 300, and improve the overall pressure-bearing safety stability and long-term operational reliability of the sealing body 300.

[0041] In an optional embodiment, both the first concrete 310 and the second concrete 320 are plain concrete with an added expansive agent. This ensures uniform material properties throughout the sealing body 300, avoiding problems such as deformation inconsistencies or additional stress concentrations at the interface due to differences in material properties between the first concrete 310 and the second concrete 320, thus guaranteeing the continuity of the overall stress distribution of the sealing body 300. The added expansive agent can compensate for shrinkage by offsetting the drying shrinkage and thermal shrinkage tensile stress during the hardening process of the sealing body 300, reducing structural cracks, enhancing the interfacial adhesion between the sealing body 300 and the surrounding rock, and comprehensively improving the pressure-bearing stability and long-term airtight reliability of the sealing body 300.

[0042] In an optional embodiment, such as Figure 1 As shown, the sealing body 300 is provided with a maintenance passage 330. One end of the maintenance passage 330 is connected to the underground artificial gas storage chamber 20, and the other end of the maintenance passage 330 is connected to the connecting passage 200.

[0043] Specifically, the maintenance passage 330 includes a vertically arranged first passage and a horizontally arranged second passage. The first passage and the second passage are connected. The first passage connects to the underground artificial gas storage cavern 20, and the second passage connects to the connecting passage 200. One enters the second passage from the connecting passage 200 and then reaches the underground artificial gas storage cavern 20 through the first passage.

[0044] In this embodiment, an inspection passage 330 is set up inside the sealing body 300. Without damaging the overall pressure-bearing structure of the sealing body 300, there is no need to excavate an additional independent inspection tunnel. This simplifies the overall layout of the underground cavern, reduces the amount of additional excavation work, and provides a convenient passage for daily inspection, airtightness testing, equipment maintenance and fault repair inside the underground artificial gas storage cavern 20, effectively improving maintenance efficiency and reducing long-term maintenance costs.

[0045] In one exemplary embodiment, such as Figure 1 As shown, the vertical section of the maintenance passage 330 is equipped with a straight ladder 340, which can be adapted to the vertical spatial layout of the shaft 100, facilitating personnel to enter the underground artificial gas storage chamber 20 via the straight ladder 340. The underground artificial gas storage chamber 20 is equipped with a sealing door 350 at the connection point to the maintenance passage 330, allowing entry and exit through the sealing door 350. The sealing door 350 ensures the overall airtightness of the underground artificial gas storage chamber 20.

[0046] In an optional embodiment, such as Figure 1 and Figure 3As shown, the length L1 of the vertical shaft 100 is set to 1 to 2 times the diameter D of the underground artificial gas storage chamber 20, and the length L1 of the vertical shaft 100 is greater than or equal to 10m. The distance L2 from the entrance of the connecting passage 200 to the sealing body 300 is set to 1 to 2 times the diameter D of the underground artificial gas storage chamber 20, and the length L2 of the vertical shaft 100 is greater than or equal to 10m.

[0047] In this embodiment, the length L1 of the shaft 100 ensures sufficient space for the vertical pressure-bearing section of the sealing body 300, achieving adequate stress diffusion and ensuring the smooth transfer of high-pressure loads from the upper part to the deep bedrock. The ample length of the shaft 100 increases the embedment contact length between the sealing body 300 and the surrounding rock, improving interface anti-slip stability and sealing reliability. The sufficient length L2 reserved in the connecting channel 200 optimizes the base stress distribution and provides ample space for construction operations and equipment relocation during the pouring of the sealing body 300 and surrounding rock support, effectively controlling the project size and construction cost while ensuring construction convenience.

[0048] In an optional embodiment, such as Figure 1 and Figure 2 As shown, the inner wall of the shaft 100 is provided with an anchor-sprayed layer 110, and the gap between the sealing body 300 and the anchor-sprayed layer 110 is filled by pressure grouting. Specifically, the anchor-sprayed layer 110 is the core composite support structure of the underground engineering surrounding rock support system. It is formed by high-pressure sprayed concrete to form a continuous and dense thin layer that adheres tightly to the surrounding rock and seals the surface cracks of the surrounding rock.

[0049] In this embodiment, the anchor-sprayed layer 110 installed on the inner wall of the shaft 100 works in conjunction with the pressure grouting filling structure to improve the working performance of the sealing body 300 system. The anchor-sprayed layer 110 can first reinforce the surrounding rock of the shaft 100 and seal shallow fissures in the rock mass, improving the integrity and deformation resistance of the surrounding rock, and providing a stable and regular bearing base for the sealing body 300. Pressure grouting can fully fill the construction gap between the sealing body 300 and the anchor-sprayed layer 110, completely eliminating interface contact gaps, making the sealing body 300 and the anchor-sprayed layer 110 tightly bonded into a load-bearing whole, improving interface cohesion and frictional resistance, enhancing the anti-slip stability and load transfer uniformity of the sealing body 300, and effectively ensuring the pressure-bearing safety and long-term operational reliability of the gas storage cavern sealing structure 10 under high-pressure conditions.

[0050] In an optional embodiment, such as Figure 1 and Figure 2 As shown, the inner wall of the connecting channel 200 is provided with a lining layer 210, which can effectively support and constrain the surrounding rock of the connecting channel 200, enhance the integrity and stability of the connecting channel 200, avoid the risk of rock falling or collapsing during the construction stage, and provide a safe and reliable working space for the pouring of the sealing body 300, equipment transportation and slag removal operations.

[0051] On the other hand, this application embodiment also provides an underground artificial gas storage cavern 20, such as Figures 1 to 3 As shown, the gas storage cavern sealing structure 10 described in any of the above embodiments includes a support layer 21 and a sealing layer 22. The support layer 21 is used on the surface of the surrounding rock, and the sealing layer 22 is used on the surface of the support layer 21 away from the surrounding rock. The inner circumferential surface of the sealing layer 22 forms a storage cavity 23, and the gas storage cavern sealing structure 10 is used at the bottom of the support layer 21.

[0052] The underground artificial gas storage cavern 20 described in this embodiment of the application has a support layer 21 and a sealing layer 22 enclosing the inner side of the surrounding rock to form a sealed storage cavity 23 for storing compressed gas. The underground artificial gas storage cavern 20 forms a sunken cavern sealing structure by setting a gas storage cavern sealing structure 10 at the bottom. The top of the sealing body 300 of the gas storage cavern sealing structure 10 abuts against the bottom of the underground artificial gas storage cavern 20 to bear pressure, and the bottom end of the sealing body 300 is inserted into the bottom surface of the connecting channel 200. The sealing body 300 can replace the natural surrounding rock at the bottom of the underground artificial gas storage cavern 20, has better structural integrity and load-bearing capacity, which is beneficial to improving the stability of the cavern. Furthermore, the deformation of the pressure-bearing structure of the sealing body 300 is small, which can reduce the amount of support work during construction. On the other hand, the bedrock at the bottom of the sealing body 300 provides sufficient frontal resistance for the sealing body 300, which greatly improves the compressive bearing capacity of the sealing body 300, thereby significantly reducing the design length of the sealing body 300, effectively reducing the engineering volume, shortening the construction period, and improving the safety and stability of the gas storage cavern sealing structure 10.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A gas storage cavity sealing structure (10), characterized in that, include: A vertical shaft (100), the top of which is used to be located at the bottom of an underground artificial gas storage chamber (20); A connecting channel (200) is provided, the bottom end of the shaft (100) is connected to the connecting channel (200), and the connecting channel (200) is used for construction of the shaft (100); A sealing body (300) is provided in the shaft (100) and the connecting channel (200). One end of the sealing body (300) near the underground artificial gas storage chamber (20) is used to abut against the bottom of the underground artificial gas storage chamber (20).

2. The gas storage cavity sealing structure (10) according to claim 1, characterized in that: The sealing body (300) includes a first concrete (310) and a second concrete (320). The first concrete (310) is disposed in the shaft (100), and the second concrete (320) is disposed at one end of the connecting channel (200) connecting the shaft (100). The first concrete (310) and the second concrete (320) are connected.

3. The gas storage cavity sealing structure (10) according to claim 2, characterized in that: The first concrete (310) is configured as a frustum structure, and the second concrete (320) is configured as a cuboid structure.

4. The gas storage cavity sealing structure (10) according to claim 3, characterized in that: The area of ​​the end face of the second concrete (320) away from the underground artificial gas storage cavern (20) is S1, and the area of ​​the end face of the first concrete (310) facing the underground artificial gas storage cavern (20) is S2. S1 is set to be 2 to 2.5 times S2.

5. The gas storage cavity sealing structure (10) according to claim 2, characterized in that: Both the first concrete (310) and the second concrete (320) are plain concrete with an expansion agent added.

6. The gas storage cavity sealing structure (10) according to any one of claims 1-5, characterized in that: The sealing body (300) is provided with a maintenance channel (330), one end of which is connected to the underground artificial gas storage chamber (20), and the other end of which is connected to the connecting channel (200).

7. The gas storage cavity sealing structure (10) according to any one of claims 1-5, characterized in that: The length L1 of the vertical shaft (100) is set to 1 to 2 times the diameter D of the underground artificial gas storage cavern (20), and the length L1 of the vertical shaft (100) is greater than or equal to 10m; the length L2 of the entrance of the connecting channel (200) from the sealing body (300) is set to 1 to 2 times the diameter D of the underground artificial gas storage cavern (20), and the length L2 of the vertical shaft (100) is greater than or equal to 10m.

8. The gas storage cavity sealing structure (10) according to any one of claims 1-5, characterized in that: The inner wall of the shaft (100) is provided with an anchor spray layer (110), and the gap between the sealing body (300) and the anchor spray layer (110) is filled by pressure grouting.

9. The gas storage cavity sealing structure (10) according to any one of claims 1-5, characterized in that: The inner wall of the connecting channel (200) is provided with a lining layer (210).

10. An underground artificial gas storage cavern (20), used in conjunction with the gas storage cavern sealing structure (10) according to any one of claims 1-9, characterized in that: It includes a support layer (21) and a sealing layer (22). The support layer (21) is used to be set on the surface of the surrounding rock, and the sealing layer (22) is set on the surface of the support layer (21) away from the surrounding rock. The inner circumferential surface of the sealing layer (22) forms a storage cavity (23), and the gas storage cavity sealing structure (10) is set at the bottom of the support layer (21).

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