大型地下洞室群节理岩体关键块体识别与稳定性分析  

Identification and Stability Analysis of Key Blocks of Jointed Rock Mass in Large-scale Underground Cavern Group

作　　者：邵明磊 徐明[1] 佘磊 姚远 李市双 康静 SHAO Minglei;XU Ming;SHE Lei;YAO Yuan;LI Shishuang;KANG Jing(PowerChina Xibei Engineering Corporation Limited,Xi'an 710065,Shaanxi,China;School of Water Resources and Hydropower,Xi'an University of Technology,Xi'an 710048,Shaanxi,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,陕西西安710065 [2]西安理工大学水利水电学院,陕西西安710048

出　　处：《水力发电》2025年第4期12-17,24,共7页Water Power

基　　金：国家资助博士后人员计划资助项目(GZB20230589)。

摘　　要：依托若羌抽水蓄能电站地下洞室群工程,基于关键块体理论,采用三维地下开挖楔体稳定性分析程序Unwedge,识别地下洞室围岩中不同产状、倾角的结构面组合形成的关键块体的分布特征;建立地下洞室主厂房、主变洞的计算模型,对关键块体进行稳定性分析,并提出支护优化措施。结果表明:选取优势结构面组合,不同工况下,主厂房中均存在1处关键块体处于失稳状态;主变洞中关键块体均处于稳定状态,安全系数最低为3.784;联合支护优化措施可使失稳块体安全稳定系数大幅度提高,最大可提高118.4%,失稳关键块体均达到稳定状态。Based on the theory of key blocks,the three-dimensional underground excavation wedge stability analysis program Unwedge is used to identify the distribution characteristics of key blocks formed by the combination of structural planes with different occurrences and dip angles in the surrounding rock of the underground cavern group of Ruoqiang Pumped-storage Power Station,and the calculation model of the main powerhouse and main transformer cave of the underground cavern is established to analyze the stability of the key blocks.The support optimization measures are also proposed.The results show that,(a)the combination of dominant structural planes shows that there is one key block in the main plant in an unstable state under different working conditions;(b)the key blocks in the main transformer cave are in a stable state,and the lowest safety factor is 3.784;and(c)the joint support optimization measures can greatly increase the stability coefficient of the unstable blocks by 118.4%at the maximum,and all the unstable key blocks reach the stable state.

关 键 词：地下洞室 关键块体 稳定性分析 结构面组合 支护优化 若羌抽水蓄能电站 

分 类 号：TU457[建筑科学—岩土工程]