压缩空气储能地下内衬硐库上覆岩体稳定性分析  

Stability analysis of overlying rock mass of lined rock caverns for compressed air energy storage

作　　者：易琪 孙冠华[1,2] 姚院峰 桂本 商浩亮 纪文栋 YI Qi;SUN Guan-hua;YAO Yuan-feng;GUI Ben;SHANG Hao-liang;JI Wen-dong(State Key Laboratory of Geotechnical Mechanics and Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China;Central Southern China Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Wuhan,Hubei 430071,China;Three Gorges Intelligent Engineering Co.,Ltd.,Wuhan,Hubei 430073,China;China Energy Digital Technology Group Co.,Ltd.,Beijing 100044,China)

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程安全重点实验室,湖北武汉430071 [2]中国科学院大学,北京100049 [3]中国电力工程顾问集团中南电力设计院有限公司,湖北武汉430071 [4]三峡智能工程有限公司,湖北武汉430073 [5]中能建数字科技集团有限公司,北京100044

出　　处：《岩土力学》2024年第12期3523-3532,共10页Rock and Soil Mechanics

基　　金：湖北省自然科学基金(三峡创新发展联合基金)重点项目(No.2022CFD031);中国能源建设股份有限公司重大科技专项(No.CEEC-KJZX-04)。

摘　　要：地下内衬硐库是压缩空气蓄能电站储气装置的主要方案,鉴于其高内气压的荷载特征,硐库上覆岩体稳定性评价是工程设计的关键环节之一。针对隧道式储气硐库,基于极限平衡理论和Mohr-Coulomb强度准则,建立了上覆岩体极限状态下被动岩土压力的力学模型,通过应力边界积分建立了三力矩平衡方程组,提出了可计算任意形态破裂面的安全系数求解方法。结果表明,安全系数主要受埋深、硐库半径、储气压力和地应力系数等因素控制,与埋深呈非线性正相关,与储气压力呈非线性负相关,与半径呈非线性负相关。针对Ⅲ级岩体条件下,给出了埋深、硐径和最大储气压力等3个设计参数满足稳定性要求的取值范围,对工程设计具有重要指导意义。Lined rock caverns(LRC)constitute a primary approach for constructing compressed air energy storage(CAES)power plants.Their mechanical capacity to withstand high internal pressures makes the stability of the overlying rock mass a crucial consideration in engineering design.For tunnel-type chambers,we establish a mechanical model of passive rock and soil pressure under the limit stress state of the overlying rock mass,based on the Mohr-Coulomb(M-C)strength criterion and the limit equilibrium concept.Stress boundary integration is applied to derive a system of three-moment equilibrium equations,and a rigorous method for calculating the safety factor of arbitrarily shaped failure surfaces is introduced.Parameter sensitivity analysis reveals that the safety factor is primarily influenced by burial depth,geostress coefficient,maximum air storage pressure,and chamber radius.The safety factor exhibits a nonlinear positive correlation with burial depth and a nonlinear negative correlation with both air storage pressure and chamber radius.For grade III rock mass,the permissible ranges of design parameters,such as burial depth,chamber radius,and maximum air storage pressure,that meet stability requirements are provided,offering valuable guidance for engineering design.

关 键 词：压缩空气储能 内衬硐库 极限平衡法 稳定性 安全系数 

分 类 号：TU457[建筑科学—岩土工程]