以礼河四级电站复建工程地下厂房围岩稳定分析  

Stability Analysis of Surrounding Rock of Underground Powerhouse of Yilihe Fourth Cascade Hydropower Station Reconstruction Project

作　　者：陆健健 金思慧 钱军 程普 LU Jian-jian;JIN Si-hui;QIAN Jun;CHENG Pu(Power China Huadong Engineering Corporation Limited,Hangzhou 311122,China)

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122

出　　处：《云南水力发电》2023年第5期30-35,共6页Yunnan Water Power

摘　　要：根据以礼河地下厂房布置情况,结合洞室围岩地质条件,通过3DEC离散元软件建立数值分析模型。通过模拟地下厂房开挖过程,对比分析地下厂房在有、无支护条件下围岩位移、应力场及塑性区分布。结果表明,洞室周围围岩变形受围岩类别及断层影响显著,Ⅲ类围岩位移及塑性区深度均小于Ⅳ类围岩,但Ⅲ类围岩更易出现应力集中及应力松弛;对围岩进行支护能有效减少围岩位移和塑性区深度,缓解应力松弛的情况。监测数据表明地下厂房整体已趋于稳定,采取的支护方案是安全有效的。According to the layout of Lihe underground powerhouse and the geological conditions of surrounding rocks of the chamber,a numerical analysis model is established by 3DEC discrete element software.By simulating the excavation process of underground power house,the displacement,stress field and plastic zone distribution of surrounding rock of underground power house with and without support are compared and analyzed.The results show that the deformation of surrounding rock around the tunnel is significantly affected by surrounding rock type and faults.The displacement and depth of plastic zone of surrounding rock type III are less than those of surrounding rock type IV,but stress concentration and stress relaxation are more likely to occur in surrounding rock type III.Supporting surrounding rock can effectively reduce displacement of surrounding rock and depth of plastic zone and relieve stress relaxation.Monitoring data show that the whole underground powerhouse has stabilized and the support scheme adopted is safe and effective.

关 键 词：地下厂房 围岩稳定 离散元 3DEC 

分 类 号：TV222.2[水利工程—水工结构工程] TV223.31