Underground cavern simulation test system sealing device and use method thereof

Abstract

The invention discloses a sealing device of an underground cavern simulation test system and a use method of the sealing device, and belongs to the technical field of underground energy storage. The device comprises a surrounding rock model, a lining model, a sealing steel ring and a sealing end cover, a cylindrical hole is formed in the surrounding rock model, and the lining model is located in the cylindrical hole; sealing end covers are fixedly connected to the two ends of the cylindrical hole, and the size of the sealing end covers is larger than that of the end face of the cylindrical hole so that the two ends of the whole cylindrical hole can be sealed; the sealing steel ring is fixedly arranged between the sealing end cover and the surrounding rock model; an annular protrusion is arranged on the side, close to the surrounding rock model, of the sealing steel ring and embedded in the lining model. The two ends of the hole in the simulation experiment are sealed through the sealing end covers, the sealing steel ring is additionally arranged, and the sealing steel ring is connected into the lining model in an annular protrusion pre-buried mode, so that it is guaranteed that high-pressure air in the cavity cannot leak out from the interface of the sealing steel ring and the model, and the sealing effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of underground energy storage, and particularly relates to a sealing device for an underground chamber simulation test system and a using method thereof. Background Art

[0002] Compressed air energy storage (compressed air energy storage) is a typical large-scale physical energy storage technology, which has the advantages of large gas storage scale, long continuous discharge time, and small environmental impact. For compressed air energy storage technology, it usually requires a large-scale gas storage container. At present, underground chambers have received extensive attention from researchers due to their wide distribution and flexible site selection. During operation, the underground chamber for compressed air energy storage is subjected to the combined action of periodic high internal pressure and temperature, which poses great challenges to the stability and sealing of the chamber. At present, the research on underground chambers for compressed air energy storage mainly remains at the theoretical analysis and numerical simulation methods, lacking relevant tests, especially verification research on model tests.

[0003] For the physical model test of the underground chamber for compressed air energy storage, the key to its success or failure lies in how to ensure the sealing of the chamber under high internal air pressure conditions. However, it is particularly difficult to achieve this. At present, there is no design research on the sealing system for the model test of the underground chamber for compressed air energy storage. However, if a physical model test of the underground chamber for compressed air energy storage is to be carried out, this problem cannot be bypassed. Therefore, at present, it is necessary to develop a scientific and feasible sealing device for the physical model test of the underground chamber for compressed air energy storage. Summary of the Invention

[0004] To solve the sealing problem in the existing physical simulation experiment of the underground chamber for compressed air energy storage, the present invention proposes a sealing device for the physical simulation test of the underground chamber with high internal pressure to ensure that the air in the chamber will not leak during the cyclic charging and discharging process in the physical simulation experiment.

[0005] The technical solution adopted by the present invention to solve its technical problems is:

[0006] The sealing device for the underground chamber simulation test system includes a surrounding rock model, a lining model, a sealing steel ring, and a sealing end cover; a cylindrical hole is opened inside the surrounding rock model, and the lining model is located within the cylindrical hole; sealing end covers are fixedly connected to both ends of the cylindrical hole, and the size of the sealing end cover is larger than the size of the end face of the cylindrical hole to form a sealing effect on both ends of the entire cylindrical hole; a sealing steel ring is further included, and the sealing steel ring is fixedly arranged between the sealing end cover and the surrounding rock model; a circular protrusion is arranged on the side of the sealing steel ring close to the surrounding rock model, and the circular protrusion is embedded in the lining model.

[0007] In this application, the two ends of the holes in the simulation experiment are sealed by a sealing end cap, and a sealing steel ring is additionally provided. The sealing steel ring is connected inside the lining model in the form of an embedded annular protrusion to ensure that the high-pressure air in the cavity does not leak out from the interface between the sealing steel ring and the model, thereby improving the sealing effect.

[0008] In some embodiments, the contact surface between the sealing steel ring and the sealing end cap is circular, the inner diameter of the ring is larger than the inner diameter of the lining model, and the annular protrusions are distributed on the innermost side of the sealing steel ring.

[0009] In some embodiments, a groove is provided on the side of the sealing steel ring near the sealing end cap, and a sealing rubber pad is arranged in the groove for sealing between the sealing steel ring and the sealing end cap.

[0010] In some embodiments, the groove is annular, and the inner side of the sealing rubber pad communicates with the internal space of the lining model.

[0011] In some embodiments, a sealing layer is provided on the inner surface of the lining model.

[0012] In some embodiments, it further includes a plurality of connecting rods. The plurality of connecting rods are arranged parallel to the extending direction of the cylindrical hole, and both ends are connected to the sealing end caps at both ends.

[0013] In some embodiments, it further includes a pre-tightening connecting piece. At least one end of the connecting rod is connected to the sealing end cap through the pre-tightening connecting piece.

[0014] In some embodiments, the pre-tightening connecting piece is an expansion bolt.

[0015] The present invention also provides a method for using a sealing device of an underground cavity simulation test system, which at least includes the following contents:

[0016] Model making: According to the set similarity ratio, make a surrounding rock model and a lining model. During the making process, the sealing steel ring is embedded into the lining model through the annular protrusion.

[0017] In some embodiments, it at least includes the following contents:

[0018] Model making: According to the set similarity ratio, make a surrounding rock model and a lining model. During the making process, the sealing steel ring is embedded into the lining model through the annular protrusion;

[0019] Sealing connection: Arrange a sealing rubber pad in the groove of the sealing steel ring, and arrange a sealing layer on the inner surface of the lining model.

[0020] In some embodiments, it at least includes the following contents:

[0021] Model making: According to the set similarity ratio, make a surrounding rock model and a lining model. During the making process, the sealing steel ring is embedded into the lining model through the annular protrusion;

[0022] Sealed connection: A sealing rubber gasket is arranged in the groove of the sealing steel ring, and a sealing layer is arranged on the inner surface of the lining model;

[0023] End cover connection: A connecting rod is fixedly connected to one side of the sealing end cover, and this side of the sealing end cover is fixedly connected to the sealing steel ring. The other side of the sealing end cover is fixedly connected to the connecting rod through expansion bolts.

[0024] The beneficial effects of the present invention are as follows:

[0025] The two ends of the hole in the simulation experiment are sealed by the sealing end cover, and a sealing steel ring is additionally provided. The sealing steel ring is connected inside the lining model in the form of pre-buried annular protrusions to ensure that the high-pressure air in the cavity will not leak out from the interface between the sealing steel ring and the model, improving the sealing effect. Description of the drawings

[0026] Figure 1 It is a schematic diagram of the overall structure of the sealing device for the underground cavity simulation test system provided by the present invention;

[0027] Figure 2 For Figure 1 The structural schematic of the sealing steel ring in Figure 1 ;

[0028] Figure 3 For Figure 1 The structural schematic of the sealing steel ring in Figure 2 .

[0029] The markings in the figure are: 1 - surrounding rock model, 2 - sealing end cover, 3 - tightening screw hole, 4 - expansion bolt, 5 - sealing rubber gasket, 6 - sealing steel ring, 7 - connecting rod, 8 - lining model, 9 - annular protrusion. Specific implementation manners

[0030] The present invention will be further described below with reference to the drawings.

[0031] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] As Figures 1 - 3 shown, the present invention provides a sealing device for an underground cavity simulation test system and its usage method.

[0033] As Figure 1 shown, the sealing device for the underground cavity simulation test system includes a surrounding rock model 1, a lining model 8, a sealing steel ring 6 and a sealing end cover 2.

[0034] The surrounding rock model 1 is made of surrounding rock similar material, and the lining model 8 is made of lining similar material.

[0035] A cylindrical hole is provided inside the surrounding rock model 1, and the lining model 8 is located within the cylindrical hole, thereby simulating the working conditions of underground chambers in practice.

[0036] Sealing end caps 2 are fixedly connected to both ends of the cylindrical hole. The size of the sealing end caps 2 is larger than the size of the end face of the cylindrical hole to form a sealing effect on both ends of the entire cylindrical hole.

[0037] It also includes a sealing steel ring 6, which is fixedly arranged between the sealing end cap 2 and the surrounding rock model 1; an annular protrusion 9 is provided on the side of the sealing steel ring 6 close to the surrounding rock model 1, and the annular protrusion 9 is embedded in the lining model 8.

[0038] In this application, the two ends of the hole in the simulation experiment are sealed by the sealing end cap 2, and a sealing steel ring 6 is additionally provided. The sealing steel ring 6 is connected to the lining model 8 in the form of being embedded by the annular protrusion 9 to ensure that the high-pressure air in the chamber will not leak out from the interface between the sealing steel ring 6 and the model, thereby improving the sealing effect.

[0039] In this embodiment, the sealing end cap 2 and the sealing steel ring 6 are fixed by bolts. As Figure 1 shown, screw holes 3 for tightening are provided at the overlapping part between the sealing end cap 2 and the sealing steel ring 6. The bolt fixing here is only for exemplary display and does not serve as a specific limitation on the fixed connection between the sealing end cap 2 and the sealing steel ring 6.

[0040] Combined with Figure 1 and Figure 2 shown, in this embodiment, the contact surface between the sealing steel ring 6 and the sealing end cap 2 is annular, the inner diameter of the ring is larger than the inner diameter of the lining model 8, and the annular protrusion 9 is distributed on the innermost side of the sealing steel ring 6.

[0041] As implemented above, the large surface of the sealing steel ring 6 is annular. During implementation, the large surfaces of the sealing steel ring 6 respectively abut against the sealing end cap 2 and the surrounding rock model 1 to ensure balanced stress and provide a sealing effect. Preferably, the annular protrusion 9 is distributed on the innermost side of the sealing steel ring 6. And combined with the aforementioned annular protrusion 9 being embedded in the lining model 8, it can be obtained that the inner diameter of the annular protrusion 9 should be larger than the inner diameter of the lining model 8, and the outer diameter of the annular protrusion 9 should be smaller than the outer diameter of the lining model 8.

[0042] Combined with Figure 1 and Figure 3 shown, in this embodiment, a groove is provided on the side of the sealing steel ring 6 close to the sealing end cap 2, and a sealing rubber pad 5 is arranged in the groove for sealing between the sealing steel ring 6 and the sealing end cap 2.

[0043] Further, the groove is annular, and the inner side of the sealing rubber pad 5 communicates with the inner space of the lining model 8.

[0044] The inner side of the sealing rubber pad 5 communicates with the inner space of the lining model 8, that is, the groove communicates with the inner space of the lining model 8. As Figure 2 shown, the inner side of the groove extends to be flush with the inner side of the sealing steel ring 6. Implementing in this way provides a good sealing effect between the sealing steel ring 6 and the sealing end cover 2.

[0045] In this embodiment, the sealing rubber pad 5 is selected as a butyl rubber pad. The material selection here is for exemplary purposes and is not specifically limited.

[0046] In this embodiment, a sealing layer is provided on the inner surface of the lining model 8, thereby improving the sealing effect and making the simulation test more in line with the actual working conditions.

[0047] In this embodiment, the sealing layer is selected as a butyl rubber layer. The material selection here is for exemplary purposes and is not specifically limited.

[0048] In this embodiment, it further includes a plurality of connecting rods 7. The plurality of connecting rods 7 are arranged parallel to the extending direction of the cylindrical hole, and both ends are connected to the sealing end covers 2 at both ends.

[0049] In practice, for optimizing the force, multiple connecting rods 7 are evenly and inseparably connected to the sealing end cover 2.

[0050] Through the arrangement of the connecting rods 7 connecting the sealing end covers 2 at both ends, the internal pressure is resisted and the air pressure acting on the front and rear end covers is reduced.

[0051] Further, it further includes a pre-tightening connecting piece. At least one end of the connecting rod 7 is connected to the sealing end cover 2 through the pre-tightening connecting piece.

[0052] Through the pre-tightening connecting piece, the connection between the connecting rod 7 and the sealing end cover 2 is realized, thereby providing a pre-tightening force and applying a pre-compressive stress to the sealing steel ring 6 and the sealing rubber pad 5, thereby further ensuring the good sealing of the cavern.

[0053] There are various choices for the pre-tightening connecting piece. For example, a threaded connecting piece generates an axial pre-tightening force by screwing the thread; for example, a wedge-shaped locking piece is pre-tightened through the self-locking principle of the inclined plane; for example, mechanical locking generates a uniform locking force through mechanical expansion.

[0054] In the embodiment, the pre-tightening connecting piece is an expansion bolt 4, which is convenient for implementation and can bear a large load force.

[0055] The present invention also provides a method for using the sealing device of the underground cavern simulation test system, which at least includes the following content:

[0056] Model making: according to the set similarity ratio, the surrounding rock model 1 and the lining model 8 are made. During the making process, the sealing steel ring 6 is embedded in the lining model 8 through the annular protrusion 9.

[0057] Specifically, in this embodiment, according to the set similarity ratio, surrounding rock similar materials are used to make surrounding rock model 1, and lining model 8 is made using lining similar materials, so as to provide a good simulation effect and make the test results more consistent with the working conditions.

[0058] Sealed connection: a sealing rubber pad 5 is arranged in the groove of the sealing steel ring 6, and a sealing layer is arranged on the inner surface of the lining model 8.

[0059] Specifically, in this embodiment, a butyl rubber pad is pasted in the groove of the sealing steel ring 6, and a 3 mm thick butyl rubber layer is pasted on the inner surface of the lining model 8, and then the entire model is pushed into the experimental system.

[0060] End cover connection: a connecting rod 7 is fixedly connected to the sealing end cover 2 on one side, and the sealing end cover 2 on this side is fixedly connected to the sealing steel ring 6 , and the sealing end cover 2 on the other side is fixedly connected to the connecting rod 7 by the expansion bolt 4 .

[0061] Specifically, in this embodiment, eight hollow steel pipes are first welded on the sealing end cover 2 on one side as connecting rods 7, and then the sealing end cover 2 on this side is tightly connected to the sealing steel ring 6 by bolts; the sealing end cover 2 and the sealing steel ring 6 are also connected on the other side, and then the expansion bolts 4 are tightened into the hollow steel pipes, and pre-compression stress is applied to the sealing steel ring 6 and the sealing rubber pad 5 by tightening the expansion bolts 4, thereby ensuring good sealing of the cavern.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Sealing device for underground chamber simulation test system, characterized in that It includes a surrounding rock model (1), a lining model (8), a sealing steel ring (6) and a sealing end cover (2); A cylindrical hole is provided inside the surrounding rock model (1), and the lining model (8) is located within the cylindrical hole; Sealing end covers (2) are fixedly connected to both ends of the cylindrical hole. The size of the sealing end cover (2) is larger than the size of the end face of the cylindrical hole to form a sealing effect on both ends of the entire cylindrical hole; It also includes a sealing steel ring (6), and the sealing steel ring (6) is fixedly arranged between the sealing end cover (2) and the surrounding rock model (1); On the side of the sealing steel ring (6) close to the surrounding rock model (1), an annular protrusion (9) is provided, and the annular protrusion (9) is embedded in the lining model (8).

2. The sealing device of the underground chamber simulation test system according to claim 1, wherein The contact surface between the sealing steel ring (6) and the sealing end cover (2) is circular. The inner diameter of the circle is larger than the inner diameter of the lining model (8), and the annular protrusion (9) is distributed on the innermost side of the sealing steel ring (6).

3. The sealing device of the underground chamber simulation test system according to claim 1, characterized in that On the side of the sealing steel ring (6) close to the sealing end cover (2), a groove is provided, and a sealing rubber pad (5) is arranged in the groove for sealing between the sealing steel ring (6) and the sealing end cover (2).

4. The sealing device of the underground chamber simulation test system according to claim 3, characterized in that, The groove is annular, and the inner side of the sealing rubber pad (5) communicates with the internal space of the lining model (8).

5. The sealing device of the underground chamber simulation test system according to any one of claims 1-4, characterized in that, It also includes a plurality of connecting rods (7). The plurality of connecting rods (7) are arranged parallel to the extending direction of the cylindrical hole, and both ends are connected to the sealing end covers (2) at both ends.

6. The sealing device of the underground chamber simulation test system according to claim 5, characterized in that, It also includes a pre-tightening connecting piece. At least one end of the connecting rod (7) is connected to the sealing end cover (2) through the pre-tightening connecting piece.

7. The sealing device of the underground chamber simulation test system according to claim 6, characterized in that, The pre-tightening connecting piece is an expansion bolt (4).

8. Method for using a sealing device of an underground cavity simulation test system, characterized in that, It at least includes the following contents: Model making: According to the set similarity ratio, the surrounding rock model (1) and the lining model (8) are made. During the making process, the sealing steel ring (6) is embedded into the lining model (8) through the annular protrusion (9).

9. The method of using the sealing device of the underground chamber simulation test system according to claim 8, characterized in that It at least includes the following contents: Model making: According to the set similarity ratio, the surrounding rock model (1) and the lining model (8) are made. During the making process, the sealing steel ring (6) is embedded into the lining model (8) through the annular protrusion (9); Sealing connection: A sealing rubber pad (5) is arranged in the groove of the sealing steel ring (6), and a sealing layer is arranged on the inner surface of the lining model (8).

10. The method for using the sealing device of the underground chamber simulation test system according to claim 9, characterized in that, It at least includes the following contents: Model making: According to the set similarity ratio, the surrounding rock model (1) and the lining model (8) are made. During the making process, the sealing steel ring (6) is embedded into the lining model (8) through the annular protrusion (9); Sealing connection: A sealing rubber pad (5) is arranged in the groove of the sealing steel ring (6), and a sealing layer is arranged on the inner surface of the lining model (8); End cover connection: The connecting rod (7) is fixedly connected to one side sealing end cover (2), and the side sealing end cover (2) is fixedly connected to the sealing steel ring (6). The other side sealing end cover (2) is fixedly connected to the connecting rod (7) through the expansion bolt (4).

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