Engineering and Technological Sciences
Abstract
Gas storage caverns are critical components of compressed air energy storage power plants. Lined rock cavern (LRC) gas storage has garnered widespread industry attention due to its flexible site selection and controllable scale. Accurately determining the internal pressure load borne by each structural layer of an LRC is a prerequisite for safety assessment and structural design analysis.
Based on the elastoplastic theory of structural stress analysis, this study proposes a calculation method for the load-sharing ratio among various structural layers of LRCs and verifies its accuracy. Furthermore, the effects of seal layer type, surrounding rock grade, lining structure type, lining reinforcement ratio, and maximum operating pressure on the internal pressure distribution ratio of each structural layer are investigated.
The research findings indicate that the surrounding rock constitutes the primary component for internal pressure load sharing in underground gas storage, with its load-sharing ratio exceeding 90%. Variations in factors such as lining structure type, lining thickness, and operating pressure have minimal impact on the internal pressure distribution ratio. In contrast, factors including seal material type, surrounding rock grade, and lining reinforcement ratio significantly influence the load-sharing ratio between the lining and surrounding rock layers.
Under the condition that the lining enters a plastic state, the presence of preset cracks in the lining has negligible effect on the load-sharing ratio, whereas increasing the lining reinforcement ratio substantially enhances the lining's share of internal pressure. The research outcomes provide theoretical support for the structural design and safety evaluation of lined rock cavern gas storage facilities.
Full Text
Study on the Internal Pressure Load Sharing Ratio of Lined Rock Cavern Gas Storage Structures Postprint
Zhang Yunlong1,2, Zheng Kexun1,2*, Jiang Zhongming3, Zhou Wanfen3, Zou Shenwei1,2, Zhao Daiyao1,2
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PowerChina Guiyang Engineering Corporation Limited, Guiyang, Guizhou 550081, China
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Geotechnical Engineering Department, HydroChina Guiyang Engineering Corporation, Guiyang, Guizhou, China
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School of Water Conservancy and Ocean Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China
Abstract
Gas storage reservoirs are crucial components of compressed air energy storage power plants. Lined rock cavern gas storage reservoirs are characterized by their flexible site selection and controllable scale. It has garnered widespread attention in the industry.
Accurately determining the magnitude of internal pressure loads borne by each structural layer of a lined rock cavern gas storage facility is crucial for its safety assessment and structural design. The premise of analysis. Based on the elastoplastic theory of structural stress analysis, this study proposes a calculation method for the load-sharing ratio of each structural layer in lined rock cavern gas storage method and verified its accuracy.
On this basis, the effects of sealing layer type, surrounding rock grade, lining structure type, and lining reinforcement ratio were investigated. The influence of factors such as the maximum operating pressure on the pressure-sharing ratio among various structural layers. The research findings indicate that the surrounding rock is the primary load-bearing component for internal pressure in underground gas storage. The main body of the tunnel can bear more than 90% of the load share.
Factors such as the lining structure type, lining thickness, and operating pressure affect the internal pressure distribution ratio. The influence of the bolt-to-rock ratio is relatively small, while factors such as the type of sealing material, the grade of surrounding rock, and the reinforcement ratio of the lining have a significant impact on the load-sharing proportion between the lining and the surrounding rock structural layers. The influence is significant.
Under the premise that the lining enters a plastic state, whether preset cracks are set in the lining has basically no effect on the load-sharing ratio, while increasing the reinforcement ratio of the lining can significantly raise the internal pressure proportion borne by the lining. The research findings can provide support for the structural design and safety assessment of lined rock cavern gas storage facilities.
Theoretical Foundations
Keywords: compressed air energy storage; lined rock cavern gas storage; plastic deformation theory; sealing structure; load sharing
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