Targeted monitoring compression type underground gas storage lining structure

Abstract

The invention belongs to the technical field of gas storage cavity energy storage, and discloses a targeted monitoring compression type underground gas storage lining structure which comprises a lining structure body, the lining structure body is arranged in surrounding rock, and a gas storage cavity used for gas storage is formed in an inner cavity of the lining structure body in a surrounding mode; the outer wall of the gas storage cavity comprises a plurality of stress surfaces which are sequentially connected end to end, the multiple stress surfaces form a closed structure, and the stress surfaces are arranged in an arc shape with the middle protruding towards the interior of the gas storage cavity; prefabricated K-shaped section steel is arranged on the outer wall of the intersection point of the adjacent stress faces and embedded into the lining structure. Monitoring units corresponding to the two corresponding stress surfaces are arranged on the prefabricated K-shaped profile steel; a sealing layer is arranged on the inner wall of the stress face in an attached mode. The method is high in practicability, easy to construct and innovative in the field of gas storages, the construction cost of the gas storages can be remarkably reduced, the safety of the gas storages can be improved, and application and popularization are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of gas storage energy storage, and in particular to a targeted monitoring type underground gas storage lining structure. Background Art

[0002] Underground gas storage has attracted widespread attention at home and abroad. It is of great significance to ensure national energy security and transformation needs and promote the upgrading of energy industries such as electricity, solar energy, and wind energy.

[0003] At present, the gas storages studied or applied in practice at home and abroad are all circular chambers. After the underground gas storage adopts a circular chamber, the sealing structure bears a large circumferential tensile stress, which is easily transmitted to the lining structure, causing structural cracking, instability and damage, and then the sealing layer fails and leaks; the outer wall of the circular chamber is evenly stressed, and the damage location is also highly random. The monitoring device can only be laid in the entire section, and the monitoring cost is high. At present, the existing underground gas storages in China all use thick steel plates as the sealing layer. The steel plate lining of the circular chamber needs to withstand a large tensile stress, which is difficult to construct, and the cost of the steel plate accounts for about 40% of the entire gas storage project. The high cost is not conducive to the industrial development of underground gas storage.

[0004] Therefore, the present application designs a targeted monitoring pressurized underground gas storage lining structure to solve the above-mentioned technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a targeted monitoring pressurized underground gas storage lining structure to solve the problems existing in the prior art.

[0006] To achieve the above-mentioned object, the present invention provides the following solution: The present invention provides a targeted monitoring pressure-type underground gas storage lining structure, comprising a lining structure, the lining structure is arranged in the surrounding rock, and the inner cavity of the lining structure is surrounded by a gas storage cavity for gas storage;

[0007] The outer wall of the air storage cavity comprises a plurality of force-bearing surfaces connected end to end in sequence, wherein the plurality of force-bearing surfaces form a closed structure, and the force-bearing surfaces are arc-shaped with the middle portion convex toward the inside of the air storage cavity;

[0008] The outer walls of the intersections of the adjacent force-bearing surfaces are provided with prefabricated K-shaped steels, and the prefabricated K-shaped steels are embedded in the lining structure;

[0009] The prefabricated K-shaped steel is provided with monitoring units corresponding to the two corresponding stress-bearing surfaces;

[0010] A sealing layer is provided on the inner wall of the force-bearing surface.

[0011] Preferably, the lining structure includes a pressure-bearing structure, the air storage cavity is arranged in the pressure-bearing structure, and the pressure-bearing structure is provided with an arc-shaped protrusion on one side of the air storage cavity to form the force-bearing surface.

[0012] Preferably, a primary lining is provided between the pressure-bearing structure and the surrounding rock.

[0013] Preferably, the prefabricated K-shaped steel includes structural surfaces respectively affixed to two adjacent load-bearing surfaces, the ends of the two structural surfaces are fixedly connected to the same load-bearing plate, the structural surface and the load-bearing plate are embedded in the pressure-bearing structure, and the monitoring unit is affixed to the structural surface.

[0014] Preferably, the load-bearing plate is arc-shaped, and the two structural surfaces are symmetrically fixed to the convex surface of the load-bearing plate.

[0015] Preferably, the structural surface is designed to be arc-shaped and matched with the force-bearing surface.

[0016] Preferably, the sealing layer is designed to be an outer arc shape that matches the force-bearing surface.

[0017] Compared with the prior art, the present invention has the following advantages and technical effects: the present invention discloses a targeted monitoring type pressure underground gas storage lining structure, the inner wall of the lining structure is designed to be a plurality of stress-bearing surfaces connected end to end, and a gas storage cavity is surrounded by the stress-bearing surfaces, so that the gas storage cavity is not a conventional circular design, but a closed structure with a plurality of corner points, the stress-bearing surface protrudes toward the gas storage cavity, and is used to bear the internal pressure of the gas storage, so that the gas storage cavity structure is under pressure as a whole during inflation operation, the sealing layer does not bear tensile stress, the lining structure is mainly under pressure, and the pressure-bearing characteristics of the lining structure can be fully mobilized, thereby improving the safety of the gas storage; prefabricated K-shaped steel is added to the stress concentration part of the connected contact points of the stress-bearing surface to bear the stress concentration load, and the tensile stress is converted into compressive stress and transmitted to the lining structure; the monitoring unit is designed on the prefabricated K-shaped steel, and the stress, strain or displacement of the stress concentration point can be targetedly monitored without full-section monitoring, thereby reducing the monitoring pressure and monitoring cost, reducing the construction difficulty, and facilitating promotion and application.

[0018] The present invention has strong practicability and is easy to construct, is innovative in the field of gas storage, can significantly reduce the construction cost of gas storage, improve the safety of gas storage, and is convenient for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1It is a schematic diagram of the lining structure of the pressurized underground gas storage reservoir for targeted monitoring according to the present invention;

[0021] Figure 2 For the present invention Figure 1 A partial enlarged view of middle A;

[0022] Figure 3 It is the cloud diagram of overall internal force calculation of the present invention;

[0023] Figure 4 It is the cloud diagram of the internal force calculation of the innermost structure of the present invention;

[0024] In the figure: 1. surrounding rock; 2. primary lining; 3. pressure-bearing structure; 4. prefabricated K-shaped steel; 5. sealing layer; 6. monitoring unit. DETAILED DESCRIPTION

[0025] Among the existing published patents, the Chinese patent with patent number CN202310403438.3 discloses a concrete lining structure suitable for soft rock gas storage, including a flexible sealing layer, an inner concrete lining layer, a sliding layer and an outer concrete lining layer arranged in sequence from the inside to the outside. The inner side of the flexible sealing layer forms a gas storage, and the inner concrete lining layer includes a plurality of inner concrete lining blocks. There are structural joints between adjacent inner concrete lining blocks, which can adapt to large deformations and effectively reduce the width of crack development to ensure the airtightness of the flexible sealing layer and improve the operating safety of the gas storage.

[0026] Specifically, in this patent, an outer concrete lining layer is poured in the excavated gas storage cavern. The thickness of the outer concrete lining layer is 30-100 cm. The main function of the outer concrete lining layer is to level the uneven rock surface excavated to form a relatively flat concrete surface.

[0027] In this patent, a sliding layer is arranged on the inner surface of the outer concrete lining layer. The thickness of the sliding layer should not be too thick, preferably 0.5-1 cm. The sliding layer includes an asphalt layer, an oil felt layer and an asphalt mastic layer arranged in sequence from the inside to the outside. Specifically, an asphalt layer is applied on the inner surface of the outer concrete lining layer, an oil felt layer is laid on the applied asphalt layer, and an asphalt mastic layer is applied outside the oil felt layer to form a sliding layer. The sliding layer has a small friction coefficient, and its function is to separate the outer concrete lining layer from the inner concrete lining layer, and reduce the constraints of the inner concrete lining layer, which is conducive to the free deformation of the inner concrete lining layer.

[0028] In this patent, an inner concrete lining layer is cast on the inner side of the sliding layer, and the inner concrete lining layer can also be made of precast concrete. The thickness of the inner concrete lining layer is 30-50cm, and it is divided into blocks, which can be divided into a number of inner concrete lining blocks. There are gaps between adjacent inner concrete lining blocks, namely structural joints, and the structural joints have the ability to open and compress. The inner concrete lining layer is divided into blocks. When the soft surrounding rock and the outer concrete lining layer around the gas storage reservoir are compressed and deformed greatly, the deformation of the inner concrete lining layer is directly absorbed by the structural joints, and the structural joints open, thereby reducing the stress of the inner concrete lining blocks, reducing the possibility of cracking of the inner concrete lining layer, or reducing the width of the crack opening, so as to benefit the safety of the flexible sealing layer.

[0029] In this patent, a tensile structure is provided on the inner side of the structural joint (i.e., the side close to the gas storage reservoir). The tensile structure is glass cloth or geotextile. Both sides of the tensile structure are bonded and fixed to the inner concrete lining blocks on both sides of the structural joint at a distance of 50 cm (L) from both sides of the structural joint through a bonding structure. Both ends of the tensile structure extend to both ends of the structural joint. When the structural joint is deformed, the glass cloth or geotextile can effectively reduce the elongation of the flexible sealing layer.

[0030] In this patent, a flexible sealing layer is arranged on the inner side of the inner concrete lining layer. The flexible sealing layer is made of flexible concrete or an airtight acrylate organic material, and the thickness of the flexible sealing layer is thickened at the structural joint, that is, the thickness of the flexible sealing layer at the structural joint is greater than the thickness of the flexible sealing layer at other locations. The thickness D of the flexible sealing layer at the structural joint is determined by the calculated maximum width of the structural joint opening and the elongation of the flexible sealing layer. Specifically, D 1 =D×h / d, where D is the maximum width of the structural joint after it is opened, d is the width of the structural joint before it is opened, and h is the thickness of the sealing layer at other locations. The flexible sealing layer at the structural joint is thickened so that after it is stretched, it still has a certain thickness to ensure the integrity of the flexible sealing layer and will not leak.

[0031] This patent levels the rock excavation surface by setting an outer concrete lining layer, forming a flat bottom surface for the sliding layer, which is conducive to the sliding of the inner concrete lining layer; setting a sliding layer with a small friction coefficient, which is conducive to the sliding of the inner concrete lining layer along this surface; setting the inner concrete lining layer in blocks, and adjacent inner concrete lining blocks are provided with structural joints, which can slide along the sliding layer when subjected to the pressure of compressed air, and absorb the deformation generated by the structural joints through the opening or compression of the structural joints, thereby reducing the stress of the inner concrete lining layer and effectively transferring the pressure it is subjected to to the outer concrete lining layer; the inner concrete lining blocks can be cast in place or prefabricated. When prefabricated, it can not only ensure the quality of the inner concrete lining layer, but also speed up the construction progress and save project investment. , and can also ensure the quality of the sliding layer, which is conducive to sliding deformation; the stress of the inner concrete lining layer is greatly reduced, which reduces the possibility of cracks. Even if cracks occur, the crack width is greatly reduced due to the smaller stress, thereby avoiding the flexible sealing layer from squeezing into the cracks when the cracks are wider and destroying its air tightness; the deformation of the inner concrete lining layer mainly occurs at the structural joints, and the width of the structural joints is wider. The thickness of the flexible sealing layer here will become thinner after stretching. Since the flexible sealing layer is thickened at the structural joints, it can be ensured that the flexible sealing layer has a certain safety thickness after stretching, thereby ensuring the air tightness of the flexible sealing layer; glass fiber cloth or geotextile is set at the structural joints, and when the structural joints are opened and deformed, a certain deformation space is reserved for the stretching of the flexible sealing layer here, thereby reducing the stretching rate of the flexible sealing layer and ensuring its safety.

[0032] Another patent with the patent number CN202410375595.2 discloses a composite lining gas storage cave structure, including a gas storage cave body, and a sealing layer lining and a main lining arranged in the gas storage cave body from the inside to the outside, wherein the main lining is formed by at least two arc-shaped segments connected end to end in sequence, and a joint seam is provided between adjacent segments. The gas storage cave structure also includes a secondary lining arranged between the main lining and the sealing layer lining to constrain the segments, and the secondary lining adopts an integral structure. The sealing layer lining is fitted on the inner surface of the secondary lining. The sealing layer lining can be made of a flexible sealing material or a steel plate.

[0033] The integral structure of the secondary lining means that there are no broken cracks in the circumferential direction of the secondary lining.

[0034] The pipe segments can be concrete pipe segments, steel sheets or other materials, such as resin. In the embodiment of the invention, the pipe segments are concrete pipe segments. In order to increase the toughness of the pipe segments, the pipe segments in the invention preferably use fiber-reinforced concrete mixed with fibers. When concrete pipe segments are used, they can be cast in place or prefabricated. In the embodiment of the invention, the pipe segments are prefabricated.

[0035] The gas storage cave structure of the invention is mainly borne by the main lining of the outer surrounding rock. When storing gas, as the gas pressure in the cave increases, the gas storage cave is gradually subjected to internal pressure (pressure from the inside of the gas storage cave to the outside). The internal pressure is transmitted to the outer surrounding rock through the sealing layer lining, the auxiliary lining and the main lining. The surrounding rock, the main lining, the auxiliary lining and the sealing layer lining are gradually deformed outward due to the internal pressure. The specific deformation process of the outward expansion deformation is as follows: radial cracks are generated on the inner side of the auxiliary lining after the pressure transmitted by the sealing layer lining, and after consuming a part of the gas storage pressure, it continues to expand and deform outward to squeeze the main lining; after the main lining is squeezed by the auxiliary lining, since it is spliced ​​by multiple segments, the main lining can be fully deformed along the splicing seam, and its segments can smoothly expand freely outward to squeeze the surrounding rock, thereby transmitting the pressure to the surrounding rock, causing the surrounding rock to expand outward and deform. When the gas storage cavern is deflated and depressurized, the air pressure in the gas storage cavity decreases, and the pressure applied to the sealing layer lining also decreases. At this time, the surrounding rock, the main lining, the secondary lining, and the sealing layer lining shrink inward due to the surrounding rock pressure, and the joints between the main lining segments become smaller and finally connected together. The main lining is supported by the secondary lining during the shrinking process, and the secondary lining can effectively constrain the main lining segments to prevent them from moving and deforming in the radial direction.

[0036] It can be understood that the more segments the main lining has, the more conducive it is to the outward expansion deformation of the main lining, and the less likely the main lining will produce uncontrollable deformation and cracking. In the embodiment of the invention, the main lining is formed by splicing and enclosing eight segments.

[0037] The gas storage cavern structure of the invention arranges the main lining into a spliced ​​structure formed by splicing at least two arc-shaped segments, and arranges a secondary lining of an integral structure on the inner side thereof. When subjected to internal pressure, the main lining can crack along the splicing seam and expand freely outward smoothly. The segments are not easy to crack, and the cracking of the main lining is controllable. Correspondingly, the secondary lining will also deform in a coordinated manner under the action of the internal pressure and the main lining. The deformation and cracking positions also mainly occur near the positions corresponding to the splicing seams. The cracking is also controllable. When expanding outward, the internal pressure can be more evenly transmitted to the main lining through the secondary lining of the integral structure, so that the segments of the main lining can expand and deform outward in a more coordinated manner. When shrinking inward, the main lining segments can be constrained by the secondary lining of the integral structure to prevent them from displacing and deforming in the radial direction. In this way, the main lining, the secondary lining, and the inner lining of the sealing layer can produce controlled, coordinated and uniform deformation. The effect is good and the service life of the sealing layer can be significantly improved.

[0038] The secondary lining can be an integrated cast-in-place concrete structure, or a steel lining or other materials with a certain rigidity. Since the secondary lining mainly serves to constrain the deformation of the segments of the primary lining, its thickness is generally small, less than the thickness of the primary lining, and generally not more than half the thickness of the primary lining. In the embodiment of the invention, the secondary lining is a concrete structure, and its thickness is half the thickness of the primary lining. In the invention, the secondary lining preferably uses fiber-reinforced concrete mixed with fibers, which has better toughness and is less prone to cracking than ordinary concrete, and is also conducive to increasing the service life of the sealing layer.

[0039] When the main lining is deformed, the joints between the segments will become larger. To reduce the adverse effects of the larger joints, such as water seepage in the main lining, a first elastic support is provided in the joints. The first elastic support can be made of rubber, elastic plastic, etc.

[0040] In order to make the deformation of each segment of the main lining more controllable, the invention also provides a prestressed rope between two adjacent segments to pull the connecting ends of the two segments toward each other. The prestressed rope can play a certain restraining role on the adjacent segments, and is also helpful to prevent them from deforming in the radial direction, and is conducive to the controlled, coordinated and uniform deformation of the main lining, the secondary lining, and the sealing layer lining. The prestressed rope is generally made of steel rope.

[0041] In some embodiments, a primary lining is provided between the gas storage cave body and the main lining, and anchor rods connected to the surrounding rock of the gas storage cave body are provided on the primary lining. The primary lining may be a concrete structure.

[0042] In the embodiment of the invention, the secondary lining is a concrete structure, and the secondary lining is provided with elastically deformable prestressed ropes arranged along its circumferential direction. The prestressed ropes help to enhance the toughness and fatigue resistance of the secondary lining, and also help to increase the service life of the sealing layer lining.

[0043] In the embodiment of the invention, as shown in the figure, the auxiliary lining is provided with a pre-crack on the inner side of the position corresponding to the joint. In this way, it can be better ensured that the auxiliary lining will crack along the position corresponding to the joint, i.e. the pre-crack, when deforming outward.

[0044] Because the flexible sealing material is easily pressed into the crack and torn, and its reliability is poorer than that of the steel plate, in this invention, the sealing layer lining adopts a steel lining. In order to make the steel lining have the ability of outward expansion compensation, as shown in the figure, along the circumferential direction of the sealing layer lining, the sealing layer lining is provided with an outwardly convex outward expansion compensation arch slope, the inner side of the arch slope forms a first groove, and the inner surface of the auxiliary lining is provided with a second groove adapted to the arch slope to accommodate the arch slope, and a spacing is set between the inner side of the second groove and the outer side of the arch slope to form a deformation clearance cavity, and the deformation clearance cavity is filled with a second elastic support body that fits the outer side of the arch slope. The arch slope generally adopts an arc structure.

[0045] In this way, during the inflation process of the gas storage cave, as the auxiliary lining is deformed outward, the inner lining steel plate of the sealing layer is also deformed outward accordingly, and the deformation of the inner lining steel plate of the sealing layer can be compensated by the deformation of the arch slope, so that the inner lining of the sealing layer can be smoothly expanded outward. During the deformation process, the arch slope will also cause the second elastic support body to deform, and the force of the arch slope can be improved by the second elastic support body, making the force more uniform.

[0046] The second elastic support body can be made of materials with certain elastic deformation ability such as rubber plate, polytetrafluoroethylene plate, steel plate, etc. In this invention, polytetrafluoroethylene plate is preferably used. Polytetrafluoroethylene plate has the advantages of wear resistance and low friction resistance, which is beneficial to relative sliding between it and the elastic support body when the arch slope is deformed, and is more conducive to improving the force of the arch slope.

[0047] Among the above two technologies, the Chinese patent with application number CN202310403438.3 discloses a solution of controlling the cracking of the main lining by setting structural joints on the main lining; the Chinese patent with application number CN202410375595.2 discloses the main and secondary lining structures to improve the service life of the sealing layer. However, these patents have not fundamentally solved the problem of the sealing layer bearing tensile stress, and have increased the difficulty of construction, and the feasibility is not ideal.

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] Reference Figure 1-Figure 4As shown, this embodiment provides a targeted monitoring pressure underground gas storage lining structure, including a lining structure, the lining structure is arranged in the surrounding rock 1, and the inner cavity of the lining structure is surrounded by a gas storage cavity for gas storage;

[0051] The outer wall of the air storage cavity includes a plurality of force-bearing surfaces connected end to end in sequence, the plurality of force-bearing surfaces form a closed structure, and the force-bearing surfaces are arranged in an arc shape with the middle portion convex toward the inside of the air storage cavity;

[0052] The outer wall of the intersection of adjacent force-bearing surfaces is provided with a prefabricated K-shaped steel 4, and the prefabricated K-shaped steel 4 is embedded in the lining structure;

[0053] The prefabricated K-shaped steel 4 is provided with monitoring units 6 corresponding to the two corresponding force-bearing surfaces;

[0054] A sealing layer 5 is provided on the inner wall of the force-bearing surface.

[0055] The present invention discloses a targeted monitoring type pressure underground gas storage lining structure, the inner wall of the lining structure is designed to be a plurality of stress-bearing surfaces connected end to end, and a gas storage cavity is surrounded by the stress-bearing surfaces, so that the gas storage cavity is not a conventional circular design, but a closed structure with a plurality of corner points, the stress-bearing surface protrudes toward the gas storage cavity, and is used to bear the internal pressure of the gas storage, so that the gas storage cavity structure is under pressure as a whole during inflation operation, the sealing layer 5 does not bear tensile stress, the lining structure is mainly under pressure, and the pressure-bearing characteristics of the lining structure can be fully mobilized, thereby improving the safety of the gas storage; prefabricated K-shaped steel 4 is added to the stress concentration part of the connected contact points of the stress-bearing surface to bear the stress concentration load, and the tensile stress is converted into compressive stress and transmitted to the lining structure; the monitoring unit 6 is designed on the prefabricated K-shaped steel 4, and the stress, strain or displacement of the stress concentration point can be targetedly monitored without full-section monitoring, thereby reducing the monitoring pressure and monitoring cost, reducing the construction difficulty, and facilitating promotion and application. The present invention has strong practicability and is easy to construct, is innovative in the field of gas storage, can significantly reduce the construction cost of gas storage, improve the safety of gas storage, and is convenient for promotion and application.

[0056] According to a further optimization scheme, the lining structure includes a pressure-bearing structure 3, an air storage cavity is arranged in the pressure-bearing structure 3, and an arc-shaped protrusion is arranged on one side of the pressure-bearing structure 3 to form a force-bearing surface; a primary lining 2 is arranged between the pressure-bearing structure 3 and the surrounding rock 1. The primary lining 2 is a rough hole excavated in the surrounding rock 1. The inner wall of the excavation is leveled by spraying concrete. At the same time, grouting reinforcement is performed for local crushing or poor surrounding rock 1, so that the rock mass around the cave becomes an integral bearing body. Its shape can be adjusted according to the condition of the surrounding rock 1. When the surrounding rock 1 is better, the excavation contour shape can be constructed according to the shape of the sealing layer 5; the pressure-bearing structure 3 adopts a reinforced concrete structure or a concrete structure, and requires the processing of a template or a template trolley for casting. The casting method can be a bottom-up then top method. Its inner wall must be composed of multiple arc-shaped load-bearing surfaces facing the gas storage cavity, which is used to bear the internal pressure of the gas storage and transfer it to the surrounding rock 1 through the primary lining 2. The prefabricated K-shaped steel 4 is located at the intersection of the two arc-shaped load-bearing surfaces and is embedded in the pressure-bearing structure 3 to bear the stress concentration load and convert the tensile stress into compressive stress and transfer it to the pressure-bearing structure 3.

[0057] A further optimized solution is that the prefabricated K-shaped steel 4 includes structural surfaces respectively attached to two adjacent load-bearing surfaces, the ends of the two structural surfaces are fixedly connected to the same load-bearing plate, the structural surface and the load-bearing plate are embedded in the pressure-bearing structure 3, and the monitoring unit 6 is attached to the structural surface; the load-bearing plate is arranged in an arc shape, and the two structural surfaces are symmetrically fixed to the convex surface of the load-bearing plate; the structural surface is designed to be arc-shaped and adapted to the load-bearing surface. The prefabricated K-shaped steel 4 includes an arc-shaped load-bearing plate, the convex side of the arc surface of the load-bearing plate faces the intersection position of the adjacent load-bearing surfaces of the air storage cavity, and two structural surfaces are symmetrically fixed on the convex side of the load-bearing plate to form a K-shaped steel. The two structural surfaces are attached to the back side of the load-bearing surface and fixed, and the connecting point of the two adjacent load-bearing surfaces is embedded in the cavity where the load-bearing plate and the two structural surfaces are fixed. After air is stored in the storage cavity, the pressure is transmitted to the load-bearing surface, and then the stress is concentrated at the intersection position of the two load-bearing surfaces. Stress conversion is performed through the prefabricated K-shaped steel 4, and the concentrated tensile stress is converted into compressive stress and transmitted to the pressure-bearing structure 3.

[0058] In one embodiment of the present application, it was found through research that the first place where damage occurs is at the end of the K-shaped steel. It is only necessary to arrange a monitoring unit 6 at this location to monitor parameters such as stress, strain or displacement caused by stress concentration, so as to achieve targeted monitoring without the need for all-round monitoring, thereby reducing the monitoring cost and workload.

[0059] In one embodiment of the present application, there are traces of excavation in the rough hole excavated in the surrounding rock 1 and cracks already existing in the rock layer. The primary lining 2 is made by shotcrete so that the primary lining 2 is tightly combined with the structure in the rough hole. At the same time, the cracks in the rough hole are reinforced to facilitate the force transfer of the pressure-bearing structure 3 to the surrounding rock 1, avoid the displacement of the primary lining 2 and the surrounding rock 1, and further improve the stability of the gas storage.

[0060] In one embodiment of the present application, the shape and composition of the pressure-bearing structure 3 can be determined according to the specific stratum conditions. When the surrounding rock 1 is very good, the amount of reinforced concrete can be minimized, and the excavation can be excavated into the shape of the inner contour of the structure as much as possible; when the surrounding rock 1 is poor, grouting anchor rods can be used for reinforcement before the construction of the primary lining 2 to improve stability.

[0061] Further optimization scheme, the sealing layer 5 is designed to be an outer arc shape that matches the force-bearing surface. The sealing layer 5 is made of corrosion-resistant flexible material or metal plate with good sealing effect, and is closely attached to the force-bearing surface of the inner wall of the gas storage reservoir in an arc-shaped manner facing outward. After the other parts are completed, they can be sprayed or glued. After the gas storage reservoir is inflated, the pressure in the gas storage cavity increases, and the sealing layer 5 is pressed more closely to the surface of the pressure-bearing structure 3. The pressure is transmitted to the force-bearing surface, so that the sealing layer 5 is subjected to pressure but not tension, which effectively avoids damage to the sealing layer 5 and extends its service life.

[0062] Refer to the attached Figure 3 and attached Figure 4 , Figure 3 This is the cloud diagram of the overall internal force calculation of the present invention, in which the dark color is mainly under pressure; Figure 4 This is the cloud diagram of the internal force calculation of the innermost structure of the present invention, in which the dark color is mainly under pressure.

[0063] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0064] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A targeted monitoring of a pressurized underground gas storage lining structure, characterized in that: It comprises a lining structure, the lining structure is arranged in the surrounding rock (1), and the inner cavity of the lining structure is surrounded by a gas storage cavity for storing gas; The outer wall of the air storage cavity comprises a plurality of force-bearing surfaces connected end to end in sequence, wherein the plurality of force-bearing surfaces form a closed structure, and the force-bearing surfaces are arc-shaped with the middle portion convex toward the inside of the air storage cavity; The outer walls of the intersections of the adjacent force-bearing surfaces are provided with prefabricated K-shaped steel (4), and the prefabricated K-shaped steel (4) is embedded in the lining structure; The prefabricated K-shaped steel (4) is provided with monitoring units (6) arranged corresponding to the two corresponding force-bearing surfaces; A sealing layer (5) is provided in close contact with the inner wall of the force-bearing surface.

2. The targeted monitoring pressure-type underground gas storage lining structure according to claim 1 is characterized in that: The lining structure comprises a pressure-bearing structure (3), the air storage cavity is arranged in the pressure-bearing structure (3), and the pressure-bearing structure (3) is provided with an arc-shaped protrusion on one side of the air storage cavity to form the force-bearing surface.

3. The targeted monitoring pressure-type underground gas storage lining structure according to claim 2 is characterized in that: A primary lining (2) is provided between the pressure-bearing structure (3) and the surrounding rock (1).

4. The targeted monitoring pressure-type underground gas storage lining structure according to claim 2 is characterized in that: The prefabricated K-shaped steel (4) comprises structural surfaces respectively attached to two adjacent load-bearing surfaces, the ends of the two structural surfaces are fixedly connected to the same load-bearing plate, the structural surface and the load-bearing plate are embedded in the pressure-bearing structure (3), and the monitoring unit (6) is attached to the structural surface.

5. The targeted monitoring pressure-type underground gas storage lining structure according to claim 4 is characterized in that: The force-bearing plate is arranged in an arc shape, and the two structural surfaces are symmetrically fixed to the convex surface of the force-bearing plate.

6. The targeted monitoring pressure-type underground gas storage lining structure according to claim 4 is characterized in that: The structural surface is designed to be arc-shaped and matched with the force-bearing surface.

7. The targeted monitoring pressure-type underground gas storage lining structure according to claim 1 is characterized by: The sealing layer (5) is designed to be in an outer arc shape that matches the force-bearing surface.

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