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王者超, 贾文杰, 冯夏庭, 王敬奎. 隧洞式内衬储气库极限储存压力解析解. 力学学报, 2023, 55(3): 710-718. DOI: 10.6052/0459-1879-22-474
引用本文: 王者超, 贾文杰, 冯夏庭, 王敬奎. 隧洞式内衬储气库极限储存压力解析解. 力学学报, 2023, 55(3): 710-718. DOI: 10.6052/0459-1879-22-474
Wang Zhechao, Jia Wenjie, Feng Xiating, Wang Jingkui. Analytical solution of limit storage pressures for tunnel type lined gas storage caverns. Chinese Journal of Theoretical and Applied Mechanics, 2023, 55(3): 710-718. DOI: 10.6052/0459-1879-22-474
Citation: Wang Zhechao, Jia Wenjie, Feng Xiating, Wang Jingkui. Analytical solution of limit storage pressures for tunnel type lined gas storage caverns. Chinese Journal of Theoretical and Applied Mechanics, 2023, 55(3): 710-718. DOI: 10.6052/0459-1879-22-474

隧洞式内衬储气库极限储存压力解析解

ANALYTICAL SOLUTION OF LIMIT STORAGE PRESSURES FOR TUNNEL TYPE LINED GAS STORAGE CAVERNS

  • 摘要: 隧洞式内衬储气库是一种新型能源储存方法, 有助于平衡供需, 推动国家由化石能源向绿色能源的持续过渡, 有利于国家“碳中和、碳达峰”目标的实现. 本文采用极限平衡方法和弹塑性分析方法推导隧洞式内衬储气库极限储存压力的解析解. 在极限平衡方法中, 考虑上覆围岩自重、破裂面受力和极限储存压力, 选用刚性锥模型, 推导了上限压力表达式; 在弹塑性分析方法中, 根据围岩中应力分布规律和剪切、抗拉强度, 推导获得了弹塑性条件下上限与下限压力表达式. 最终综合考虑两方法求得的结果, 确定极限储存压力解析解. 结果表明: 极限平衡方法求得上限压力与埋深呈二次函数关系, 且随着侧压力系数的增大而增大; 弹塑性分析方法确定的上限压力和下限压力与埋深呈线性关系, 下限压力随着侧压力系数的增大而减小, 且Ⅰ级围岩条件下的内衬储气库不用考虑下限压力. 在侧压力系数λ = 1.2时上限压力最大, 因此应尽量在侧压力系数为1.2的围岩条件下修建隧洞式储气库. 最后根据典型工况下上限和下限压力曲线给出内衬洞室推荐压力范围.

     

    Abstract: Tunnel lined cavern gas storage is a new energy storage method, which helps balance supply and demand, promotes the continuous transition from fossil energy to green energy, and facilitates the realization of national goal of "carbon neutralization and carbon peak". In this paper, the ultimate equilibrium method and the elastoplastic analysis method are used to derive the analytical solution of the ultimate storage pressure of tunnel lined rock cavern gas storage. In the ultimate equilibrium method, the self-weight of the overlying surrounding rock, the force of the fracture surface and the ultimate storage pressure are considered, the rigid cone model is selected, and the upper limit pressure expression is derived. In the elastoplastic analysis method, according to the stress distribution law and shear and tensile strength in the surrounding rock, the upper and lower pressure expressions under elastoplastic conditions are derived. Finally, the analytical solution of the ultimate pressure is determined with considering the results obtained by the two methods. The results show that the relationship between the upper limit pressure and the buried depth is quadratic function, and increases with the increase of lateral pressure coefficient; The upper limit pressure and lower limit pressure determined by the elastoplastic analysis method are linear with the burial depth, and the lower limit pressure decreases with the increase of the lateral pressure coefficient, and the lower limit pressure is not considered for the lined gas storage under the condition of class I surrounding rock. When the lateral pressure coefficient is 1.2, the upper limit pressure is the largest, so the tunnel type gas storage should be built as far as possible under the surrounding rock condition with the lateral pressure coefficient of 1.2. Finally, the recommended pressure ranges of lined rock caverns are given according to the upper and lower limit pressure curves under typical working conditions.

     

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