软岩力学参数取值对洞室围岩变形应力及塑性区影响的敏感性分析  

Sensitivity Analysis of Soft Rock Mechanical Parameters to the Deformation,Stress and Plastic Zone of Surrounding Rock of Underground Cavern Group

作　　者：陈张华 陈昱彤 邓洋 虞东亮 张恒 CHEN Zhanghua;CHEN Yutong;DENG Yang;YU Dongliang;ZHANG Heng(Chongqing Panlong Pumped Storage Co . , Ltd . , Chongqing 401452, China;PowerChina Zhongnan Engineering Corporation Limited, Changsha 410014, Hunan, China;College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, Jiangsu, China)

机构地区：[1]重庆蟠龙抽水蓄能有限公司,重庆401452 [2]中国电建集团中南勘测设计研究院有限公司,湖南长沙410014 [3]河海大学水利水电学院,江苏南京210098

出　　处：《水力发电》2019年第8期59-62,共4页Water Power

基　　金：国家自然科学基金面上基金资助项目(51279053)

摘　　要：通过地质勘测、试验得到的围岩力学参数通常是一个区间值,计算时的不同取值对地下厂房位移、应力、塑性区有一定的影响。结合蟠龙抽水蓄能工程,建立了地下洞室群三维整体有限元模型,通过力学参数试验值的上下限取值,分析参数对主厂房位移、应力及塑性区的影响。结果表明,Ⅳ类、Ⅴ类变形弹性模量降低时,对位移影响最为显著,对应力与塑性区的影响相对较小;2种取值工况下,主厂房沿垂直厂房轴线方向的位移增幅达18%,应力和塑性区的变化在10%内。The magnitude of mechanical parameters of surrounding rock obtained through geological survey and experiment is usually in an interval,and different values of mechanical parameters usually have certain influence on the displacement,stress and plastic zone of underground powerhouse. Combined with Panlong Pumped-storage Power Station project,a three-dimensional integral finite element model of underground cavern group is established,and the influences of mechanical parameters on the displacement,stress and plastic zone of main underground cavern are analyzed by taking the upper and lower limits of mechanical parameters as model input respectively. The results show that,( a) when the elastic modulus of class Ⅳ and Ⅴ soft rock decrease,the influence on displacement is the most significant,and the influence on stress and plastic zone is relatively smaller;and( b) under two operating conditions with different mechanical parameters,the displacement of main powerhouse cavern at the vertical direction of powerhouse axis is increased by 18%,and the changes in stress and plastic zone are within 10%.

关 键 词：地下洞室群 软岩 力学参数 敏感性分析 蟠龙抽水蓄能电站 

分 类 号：TV222.2[水利工程—水工结构工程] TV2719