压气储能地下内衬储气库运行压力区间确定方法

doi:10.13722/j.cnki.jrme.2024.0308

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摘要地下内衬储气库运行压力区间关乎其长期稳定性和建造成本，是一个重要设计参数。目前主要从储气库抗隆起稳定性角度确定储气压力区间，未能考虑围岩的塑性状态，不利于其长期稳定性。为此，从储气库结构的受力特征出发，按照弹性设计理念，分析储气库结构的弹塑性状态，提出储气库运行压力区间的确定方法并解释其物理意义。当储气库在此区间循环充放气时，储气库结构始终处于弹性状态，避免塑性变形和结构损伤在循环过程中不断累积，有利于储气库的长期稳定性。进一步，分析储气库半径、混凝土衬砌等级和厚度、围岩强度、地应力和侧压力系数等因素对储气库运行压力区间的影响。结果表明：储气库运行压力区间的物理意义是以地应力特征点为圆心，分别作圆与围岩强度曲线相切，该圆与正应力轴2个交点即是储气库上下限运行压力；地应力、侧压力系数和围岩强度是影响储气库运行压力区间的主要因素；储气库半径，混凝土衬砌厚度，混凝土等级是可忽略因素；在勘察阶段围岩强度难以精确定量情况下，储气库运行压力区间大致在0.5～1.5倍的地应力，若地应力远离等向状态，此区间应缩小。相关成果可为压气储能电站储气库运行压力区间确定提供理论支撑。

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	张国华1
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	3
	王薪锦2
	柯洪2
	4
	相月2
	郭辉3
	熊峰2
	华东杰2

关键词 ：地下工程, 压气储能, 储气库, 运行压力区间, 弹塑性状态

Abstract：The operating pressure range of lined underground gas storage facilities is an important design parameter，which is related to its long-term satiability and cost. Currently，the operating pressure range is mostly determined from the perspective of anti-uplift stability. The plastic state of the surrounding rock，which threatens the long-term stability of the CAES system，is not taken into consideration. Therefore，starting from the force characteristics of the gas storage structure，the elastoplastic state of the gas storage structure is analyzed according to the elastic design concept. A method to determine the operating pressure is proposed and its physical meanings are explained. When the operating pressure range during gas injection and withdrawal cycles is in this range，the structures of the gas storage remain in an elastic state，avoiding continuous accumulation of plastic deformation and structural damage. It is helpful for the long-term operation of the gas storage facility. Furthermore，the influences of factors such as the radius of the gas storage facility，the grade and thickness of the concrete lining，the strength of the surrounding rock mass，the crustal stress and the lateral pressure coefficient on operating pressure range are analyzed. The results show that the physical meaning of the operating pressure range is to use the crustal stress typical points as the center，draw a circle tangent to the surrounding rock strength curve，and the two points where this circle intersects with the axis of normal stress are the upper and lower limits of the operating pressure；the crustal stress，the lateral pressure coefficient and the strength of the surrounding rock mass are the main factors that affecting the operating pressure range；factors such as the radius of the gas storage facility，the grade and thickness of the concrete lining can be neglected；When the grade of the surrounding rock mass is unknown during the survey stage，the operating pressure range is generally between 0.5 to 1.5 times the crustal stress and this range should be further reduced if the crustal stress is far away from the isotropic state. These findings can provide theoretical support for determining the operating pressure range of the LRC in a CAES system.

Key words： underground engineering compressed air energy storage lined rock cavern operating pressure range elastoplastic states

引用本文:

张国华1，2，3，王薪锦2，柯洪2，4，相月2，郭辉3，熊峰2，华东杰2. 压气储能地下内衬储气库运行压力区间确定方法[J]. 岩石力学与工程学报, 2024, 43(12): 2874-2891.
ZHANG Guohua1，2，3，WANG Xinjin2，KE Hong2，4，XIANG Yue2，GUO Hui3，XIONG Feng2，HUA Dongjie2. A method to determine the operating pressure range of lined underground gas storage facility in a compressed air energy storage system. , 2024, 43(12): 2874-2891.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2024.0308 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I12/2874

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