压气储能地下内衬储气库结构荷载分担解析解及影响因素分析

doi:10.13722/j.cnki.jrme.2024.0070

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摘要与传统无内压地下工程不同，压气储能(CAES)内衬储气库承担交变温压循环膨胀荷载，作为其设计、建造基础的围岩–支护–密封结构协同受力机制、变形特征及荷载分担机制等理论体系尚未建立，亟待开展相关研究。首先，基于多层厚壁圆筒理论建立储气库在高内压荷载下的受力模型，给出其应力和变形的解析解。然后，在设定计算方案下，分析储气库半径、最大储气内压、钢衬厚度等敏感参数对储气库力学响应和荷载分担占比的影响，揭示各结构径向受压、位移较小、环向受拉为主的现象；明确围岩变形模量是影响储气库力学响应最显著因素，储气库半径、最大储气内压、混凝土衬砌厚度和地应力次之，混凝土衬砌强度影响较小但强度提高有加剧开裂的可能，钢衬厚度几乎没有影响；阐明围岩是荷载承担主体，混凝土衬砌次之，钢衬几乎不承担荷载。其次，讨论了储气库充放气过程受力特征，发现其环向存在拉压转变的现象，受拉潜在开裂区随内压增大而扩大。最后，提出钢衬屈服临界内压和混凝土衬砌开裂临界内压的概念，并揭示围岩变形模量和地应力是控制钢衬和混凝土衬砌性能劣化甚至开裂的关键。相关成果为压气储能内衬储气库的设计及建造提供理论支撑。

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	张国华1
	2
	相月1
	王薪锦1
	熊峰1
	唐志成1
	华东杰1

关键词 ：地下工程, 压气储能, 内衬储气库, 理论模型, 力学响应, 荷载分担

Abstract：Unlike traditional underground engineering without inner pressure，the lined rock cavern of compressed air energy storage(CAES) serves as the basis for its design and construction，bearing alternating thermal and pressure cyclic expansion loads. The interaction mechanism，deformation characteristics，and load sharing mechanism of the surrounding rock mass-support-sealing structure have not yet been established，and related research is urgently needed. Firstly，a theoretical model for the CAES under high inner pressure was established based on the multi-layer thick-walled cylinder theory，and the analytical solutions for its stress and deformation were provided. Then，under the set calculation scheme，the influences of sensitive parameters such as the radius of the CAES，maximum inner pressure，and steel lining thickness on the mechanical response and load sharing ratio of the CAES were analyzed，revealing phenomena where the radial compression of the structures，small displacement，and mainly hoop tension occur. It was clarified that the deformation modulus of the surrounding rock mass is the most significant factor influencing the mechanical response of the CAES，followed by the radius of the CAES，maximum inner pressure，and thickness of the concrete lining，while the strength of the concrete lining has a minor impact but an increase in strength may exacerbate cracking. The thickness of the steel lining has almost no effect. It was demonstrated that the surrounding rock mass bears the main load，followed by the concrete lining，while the steel lining hardly bears any load. Secondly，the mechanical response during the charging and discharging process of the CAES were discussed，revealing the phenomenon of hoop tension and compression transition，with the potential cracking zone expanding with the increase of inner pressure. Finally，the concepts of critical inner pressure of the steel lining yielding and critical inner pressure of the concrete lining cracking were proposed，and it was revealed that the deformation modulus of the surrounding rock mass and the crustal stress are the key factors controlling the deterioration and even cracking of the steel lining and concrete lining. The related achievements provide theoretical support for the design and construction of lined rock cavern for compressed air energy storage.

Key words： underground engineering compressed air energy storage lined rock cavern theoretical model mechanical response load-sharing

引用本文:

张国华1，2，相月1，王薪锦1，熊峰1，唐志成1，华东杰1. 压气储能地下内衬储气库结构荷载分担解析解及影响因素分析[J]. 岩石力学与工程学报, 2024, 43(S2): 3633-3650.
ZHANG Guohua1，2，XIANG Yue1，WANG Xinjin1，XIONG Feng1，TANG Zhicheng1，HUA Dongjie1. Analytical solution for load sharing in the structure of an underground lined rock cavern for compressed air energy storage and analysis#br# of influencing factors. , 2024, 43(S2): 3633-3650.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2024.0070 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS2/3633

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