CN-122016491-A - Device and method for testing cracking and sealing performance of lining structure under high internal pressure condition

CN122016491ACN 122016491 ACN122016491 ACN 122016491ACN-122016491-A

Abstract

The invention relates to a device and a method for testing cracking and sealing performance of a lining structure under a high internal pressure condition, and belongs to the technical field of compressed air energy storage. The test device comprises a cavity simulation cavity, a rubber capsule, a prefabricated lining device, a high internal pressure loading system and a data acquisition and monitoring system. The rubber bag is arranged in the cavity simulating cavity, the prefabricated lining device is arranged on the outer side of the rubber bag and comprises a sealing layer and a concrete lining layer, the high internal pressure loading system is communicated with the rubber bag and is used for applying controllable high internal pressure load into the rubber bag so that the concrete lining layer is cracked under the action of radial internal pressure, and the data acquisition and monitoring system is used for monitoring stress deformation, crack development and sealing performance of the lining layer. By the test device and the test method, the cracking process of the lining of the high-internal-pressure gas storage cavity and the influence of the cracking process on the sealing layer can be simulated, and test basis is provided for the safety and sealing performance evaluation of the underground gas storage cavity.

Inventors

HAN YUE
LIU NING
CHEN PINGZHI
GAO YAOHUI
LI ZHENGLIANG

Assignees

中国电建集团华东勘测设计研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20260108

Claims (9)

1. A test device for cracking and sealing performance of a lining structure under a high internal pressure condition is characterized by comprising: the cavity simulation cavity is used for accommodating the rubber capsule and the prefabricated lining device; the rubber capsule is arranged in the cavity simulation cavity and used for applying radial internal pressure outwards in the loading process; The prefabricated lining device is arranged in the cavity simulating cavity and positioned at the outer side of the rubber bag, and comprises a sealing layer and a concrete lining layer; The high internal pressure loading system is communicated with the rubber bag and is used for applying controllable high internal pressure load into the rubber bag; The data acquisition and monitoring system is used for monitoring the stress deformation, crack development and sealing performance of the sealing layer of the concrete lining layer; And the high internal pressure loading system is used for applying high internal pressure to the rubber bag, so that the concrete lining layer is cracked under the action of radial internal pressure, and the cracking of the lining of the high internal pressure gas storage cavity and the influence of the cracking on the sealing layer are simulated.
2. The test device according to claim 1, wherein the chamber simulation cavity is a closed pressure-bearing cavity, and two ends of the chamber simulation cavity are provided with end cover structures to form a closed test space.
3. The test device according to claim 1 or 2, wherein the cavity simulation cavity is provided with an observation window for visually observing crack development of the concrete lining layer in the test process.
4. The test device of claim 1, wherein the rubber bladder is a hollow elastomer structure having an interior in communication with the high internal pressure loading system for uniformly applying radially internal pressure outwardly during loading.
5. The test device of claim 1 or 4, wherein the rubber bladder is mounted in the cavity simulation chamber by a piercing fixture to limit axial displacement of the rubber bladder during loading.
6. The test device of claim 1, wherein the prefabricated lining device is of an annular structure, and the sealing layer is arranged on the inner side of the concrete lining layer, and the prefabricated lining device and the sealing layer form a cooperatively stressed composite lining structure.
7. The test device of claim 1, wherein the high internal pressure loading system is a controllable loading system capable of applying a constant pressure load or a cyclic pressure load to the rubber bladder.
8. The test device of claim 1, wherein the data acquisition and monitoring system comprises a stress-strain sensor and a crack-monitoring device for synchronously acquiring mechanical response and crack evolution information of the concrete lining layer.
9. A test method for cracking and sealing performance of a lining structure under a high internal pressure condition is characterized by comprising the following steps: 1) Arranging a rubber bag and a prefabricated lining device in the cavity simulating cavity in sequence, so that the prefabricated lining device is positioned at the outer side of the rubber bag, and comprises a sealing layer and a concrete lining layer; 2) The high internal pressure loading system is communicated with the rubber bag, and high internal pressure load is applied to the rubber bag through the high internal pressure loading system, so that the rubber bag externally applies radial internal pressure; 3) In the loading process, the stress deformation and crack development conditions of the concrete lining layer are monitored in real time, and the sealing performance of the sealing layer is monitored; 4) And according to the monitoring result, acquiring the cracking process of the concrete lining layer under the action of high internal pressure and the influence characteristics of the concrete lining layer on the sealing layer.

Description

Device and method for testing cracking and sealing performance of lining structure under high internal pressure condition Technical Field The disclosure relates to the field of compressed air energy storage, in particular to a device and a method for testing cracking and sealing performance of a lining structure under a high internal pressure condition, which are particularly suitable for design and safety evaluation of an underground gas storage cavity of a compressed air energy storage power station. Background Compressed air energy storage is widely focused as a large-scale energy storage technology with great development potential. The underground gas storage cavern is a key part of the compressed air energy storage power station and is used for storing high-pressure gas. The wall of the hole generally comprises a sealing layer, a lining and a surrounding rock, wherein the lining layer is arranged between the surrounding rock and the sealing layer, so that pressure is transmitted to the surrounding rock, the integrity of the sealing layer is protected, and the safety of operation of the gas storage is important. However, under the action of high internal pressure, the hoop stress of the concrete lining easily exceeds the tensile strength of the concrete lining, so that the concrete lining is cracked, thereby influencing the load transmission and the integrity of the sealing layer, and threatening the operation safety of a storage warehouse. The traditional mechanical test simulation method can not accurately reflect the synergistic effect process of the composite structure under high internal pressure, the indoor model test and the in-situ test can be reduced to a certain extent, but the in-situ test investment is large and is not easy to realize, and the model test developed at present is large in device size, long in test implementation period and weak in repeatability. Therefore, in order to develop a plurality of groups of comparative tests and explore the cracking of the lining and the influence of the cracking on the sealing layer, a small, exquisite and light high-internal pressure test device and method are needed. Disclosure of Invention The disclosure aims to provide a test device and a test method for lining cracking and sealing performance under a high internal pressure condition, so as to more accurately evaluate the stress deformation characteristic of the lining and the influence of the cracking on a composite structure, particularly a sealing layer, and provide scientific basis for design, construction, operation and maintenance of a gas storage cavity. In order to achieve the above purpose, the present disclosure adopts the following technical scheme: A test device for cracking and sealing performance of a lining structure under a high internal pressure condition comprises: the cavity simulation cavity is used for accommodating the rubber capsule and the prefabricated lining device; the rubber capsule is arranged in the cavity simulation cavity and used for applying radial internal pressure outwards in the loading process; The prefabricated lining device is arranged in the cavity simulating cavity and positioned at the outer side of the rubber bag, and comprises a sealing layer and a concrete lining layer; The high internal pressure loading system is communicated with the rubber bag and is used for applying controllable high internal pressure load into the rubber bag; The data acquisition and monitoring system is used for monitoring the stress deformation, crack development and sealing performance of the sealing layer of the concrete lining layer; And the high internal pressure loading system is used for applying high internal pressure to the rubber bag, so that the concrete lining layer is cracked under the action of radial internal pressure, and the cracking of the lining of the high internal pressure gas storage cavity and the influence of the cracking on the sealing layer are simulated. Further, the cavity simulation cavity is a closed pressure-bearing cavity, and end cover structures are arranged at two ends of the cavity simulation cavity to form a closed test space. Further, an observation window is arranged on the cavity simulating cavity and used for visually observing the crack development condition of the concrete lining layer in the test process. Further, the rubber bag is of a hollow elastomer structure, and the inside of the rubber bag is communicated with the high internal pressure loading system so as to apply radial internal pressure outwards uniformly in the loading process. Further, the rubber bag is arranged in the cavity simulation cavity through the penetrating fixing structure so as to limit the axial displacement of the rubber bag in the loading process. Further, the prefabricated lining device is of an annular structure, the sealing layer is arranged on the inner side of the concrete lining layer, and the prefabricated lining device and the sealing layer form a