西北泥砂岩场地隧道式储气库安全埋深探讨  

Discussion on the safe burial depth for tunnel gas storage in mudstone-sandstone sites in Northwest China

作　　者：杨子江 曹雷年 薛建华 王章星 YANG Zijiang;CAO Leinian;XUE Jianhua;WANG Zhangxing(Ningxia Branch,China Datang Group Co.,Ltd.,Yinchuan 750000,China;Datang Zhongning Energy Development Co.,Ltd.,Zhongwei 755000,Ningxia,China;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)

机构地区：[1]中国大唐集团有限公司宁夏分公司,银川750000 [2]大唐中宁能源开发有限公司,宁夏中卫755000 [3]中国科学院武汉岩土力学研究所,武汉430071

出　　处：《安全与环境学报》2025年第3期929-936,共8页Journal of Safety and Environment

摘　　要：我国西北地区风光资源丰富,适合修建大规模压缩空气储能电站。为探究西北泥砂岩场地风化层对电站地下储气库安全埋深的影响,基于极限平衡理论法与被动岩土压力理论,综合考虑实际地层、抗剪强度参数及风化地层,建立了新型锥体破坏模型,实现了考虑风化层的地下隧道式储气库安全埋深的计算,并开发了初值迭代法求解程序。针对12 m洞径、10 MPa内压且安全系数为2.0的泥砂岩地层内衬储气库,采用Kim竖直滑面法、刚体圆锥法及所提出的考虑风化层极限平衡法分别计算安全埋深,均为80 m左右,其中所提出方法的结果较大。分析结果表明,硐库内壁起裂角和上覆岩体破裂面倾角主导锥体模型极限平衡,风化层显著影响泥砂岩场地安全埋深,使计算埋深增加11.25 m。研究对于硐库埋深的确定具有应用价值,可以为同类地质硐库工程的设计及施工提供技术参考。The northwest region of China boasts abundant wind and solar resources,making it ideal for the development of large-scale compressed air energy storage power stations.This study aims to investigate the impact of the weathered layer on the safe burial depth of underground gas storage reservoirs at mudstone-sandstone sites in Northwest China.Utilizing limit equilibrium theory and passive geotechnical pressure theory,we comprehensively analyzed the actual stratigraphy,shear strength parameters,and the characteristics of the weathered stratum.A novel cone failure model was established to calculate the safe burial depth of the underground tunnel-type gas storage reservoir while accounting for the weathered layer.Additionally,a program was developed using the initial value iteration method to facilitate these calculations.For inner-lined gas storage caverns within a mudstone-sandstone formation,characterized by a tunnel diameter of 12 m and an internal pressure of 10 MPa,the safe burial depths calculated using Kim's vertical sliding surface method,the rigid body cone method,and the limit equilibrium method-considering the weathered layer as proposed in this study-are all approximately 80 meters.Notably,the results obtained from the method presented in this paper yield the largest safe burial depth among these approaches.The analysis indicates that the cracking angle of the inner wall of the cavern and the inclination of the fracture surface in the overlying rock mass are the key factors that determine the ultimate equilibrium state of the cone model.The weathering effect disrupts the bonding between rock particles,leading to a reduction in both the unit weight and shear strength of the rock.Taking the weathered layer into account significantly impacts the safe burial depth at mudstone-sandstone sites,resulting in an increase of 11.25 m in the calculated burial depth.This study holds significant practical value in determining the burial depth of caverns and offers technical insights for the design and construction of si

关 键 词：安全工程 压缩空气储能 极限平衡 安全埋深 风化层 泥砂岩场地 

分 类 号：X947[环境科学与工程—安全科学]