压缩空气储能电站隧道式地下硐库潜在失稳模式研究  

Study on the potential instability patterns of tunnel type underground caverns for compressed air energy storage

作　　者：孙冠华[1,2] 易琪 姚院峰 商浩亮 纪文栋 SUN Guanhua;YI Qi;YAO Yuanfeng;SHANG Haoliang;JI Wendong(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;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国家重点实验室,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]中能建数字科技集团有限公司,北京100044

出　　处：《岩石力学与工程学报》2024年第1期41-49,共9页Chinese Journal of Rock Mechanics and Engineering

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(2022CFD031);中国能源建设股份有限公司重大科技专项(CEEC-KJZX–04)。

摘　　要：随着新能源的迅猛发展,不同于传统隧洞工况的压缩空气储能电站地下硐库存在上覆岩体稳定性问题,其潜在失稳模式亟待研究。采用Mohr-Coulomb强度准则,基于岩体极限应力场,同时考虑张拉和剪切破坏2种模式,将浅埋隧道式岩石内衬硐室潜在失稳模式归结为一簇常微分方程组的初值问题,并给出了求解方法。与物理模型试验结果对比分析,验证了方法的可靠性。并研究埋深、硐径、地应力系数以及内摩擦角对失稳形态的影响,结果表明地应力系数和内摩擦角影响较大,最大水平地应力方向垂直于隧道式硐室轴线更利于上覆岩体稳定。另一方面,内摩擦角对失稳形态的影响依赖于地应力系数,当地应力系数小于1时,内摩擦角越小潜在破裂面越接近水平方向;地应力系数等于1时,内摩擦角几乎无影响;地应力系数大于1时,内摩擦角越大潜在破裂面越接近水平方向。鉴于此,硐室布置、埋深和硐径设计应综合考虑地应力和内摩擦角影响。最后,将潜在破坏面形态进行简单的几何参数化,给出几何参数与地应力系数和内摩擦角的对应关系,以供工程设计参考。在破坏模式上,地应力系数较小时,潜在破裂面为张拉–剪切复合模式,张拉区域位于靠近硐壁和地表位置;地应力系数较大时,则为剪切破坏。With the rapid development of new energy sources,the compressed air energy storage(CAES)underground caverns,which differ from traditional tunnel conditions,face stability issues in the overlying rock mass.The potential instability modes of these shallow-buried tunnel-type CAES caverns urgently need to be studied.Adopting the Mohr-Coulomb strength criterion and based on the ultimate stress field of the rock mass and considering both tensile and shear failure modes,the problem of potential instability modes in shallow buried high internal pressure tunnel-type lined rock caverns is reduced to the initial value problem of a cluster of ordinary differential equations,and the solution method is given.The reliability of the method is verified by comparing and analyzing the results with the physical model test results.In addition,the effects of burial depth,tunnel diameter,in-situ stress ratio and internal friction angle on the instability pattern are investigated,and the results show that the in-situ stress ratio and internal friction angle have a significant influence.The horizontal stress direction is perpendicular to the axis of the tunnel,which is more conducive to the stability of the overlying rock.On the other hand,the influence of the internal friction angle on the instability pattern depends on the in-situ stress ratio.When the in-situ stress ratio is less than 1,the smaller the internal friction angle is,the closer the potential rupture surface is to the horizontal;when the in-situ stress ratio is equal to 1,the internal friction angle has almost no effect;when the in-situ stress ratio is greater than 1,the larger the internal friction angle is,the closer the potential rupture surface is to the horizontal.In view of this,the design of cavern layout,burial depth and diameter should consider both insitu stress and internal friction angle.Finally,potential failure surface morphology is parameterized in a simple geometric way,and the correspondence between the geometric parameters and the in-situ stress ratio and

关 键 词：隧道工程 压缩空气储能 潜在破坏面 高气压地下硐室 稳定性 

分 类 号：U45[建筑科学—桥梁与隧道工程]