岩土力学2026，Vol.47Issue(2)：515-529,538,16.DOI:10.16285/j.rsm.2025.0821
压缩空气储能地下储气库椭圆形断面最佳轴比及运行压力区间确定方法
Method for determining the optimal axial ratio of elliptical section and operating pressure range in CAES underground gas storage facility
摘要
Abstract
The cross-sectional shape of an underground gas storage in a compressed air energy storage(CAES)power plant significantly influences its stress state,thereby affecting gas tightness and stability.It is conventionally considered that a circular cross-section yields the most favorable stress distribution.However,under anisotropic in-situ stress conditions,the hoop stress around a circular cavern is uneven and can induce localized lining cracking and gas leakage.To address this issue,this study investigates elliptical cross-section storage caverns using theoretical analysis based on elasticity theory.First,we propose a gas-tightness criterion based on the elastic stress state and derive an analytical solution for the elliptical cross-section's optimal axial ratio.Second,we establish a stability criterion for lined rock caverns under anisotropic in-situ stress and develop a method to determine the operating pressure range for elliptical cross-sections,comparing it with the circular cross-section.Furthermore,we perform a parameter sensitivity analysis using FLAC3D to evaluate how factors affect the elliptical cross-section's optimal axial ratio and operating pressure range.Finally,we establish an integrated calculation process to determine the optimal axial ratio and pressure range.Results show that,under anisotropic in-situ stress conditions,an elliptical cross-section designed with an optimal axial ratio can produce uniform hoop stress around the cavern.When an elliptical cross-section gas storage facility is designed with the optimal axis ratio,its pressure operating range is maximized.The lateral pressure coefficient,in-situ stress and internal pressure of gas storage are the main factors affecting the operating pressure range of elliptical section gas storage.These findings provide theoretical guidance for the shape optimization and pressure design of underground gas storage caverns.关键词
压缩空气储能/储气库/椭圆形断面/最佳轴比/运行压力区间Key words
compressed air energy storage/gas storage cavern/elliptical section/optimal axial ratio/operating pressure range分类
建筑与水利引用本文复制引用
张国华,郭辉,张世殊,周芝仪,相月,熊峰,华东杰..压缩空气储能地下储气库椭圆形断面最佳轴比及运行压力区间确定方法[J].岩土力学,2026,47(2):515-529,538,16.基金项目
国家自然科学基金(No.U24A20599).This work was supported by the National Natural Science Foundation of China(U24A20599). （No.U24A20599）
