某水电站地下厂房施工期开挖监测反馈分析  

Monitoring feedback analysis on excavation of a underground powerhouse during construction

作　　者：杨琼[1] 彭薇薇[2] 佘鸿翔[2] 张建海[1] 

机构地区：[1]四川大学水力学及山区河流开发与保护国家重点实验室水利水电学院,四川成都610065 [2]中国电建集团成都勘测设计研究院有限公司,四川成都610072

出　　处：《人民长江》2014年第17期94-98,103,共6页Yangtze River

摘　　要：大渡河干流上的黄金坪水电站地下厂房洞室群规模巨大,厂区大小断层丰富,主厂房位于高地应力区。采用三维非线性有限元法,根据4个剖面的监测资料,开展了地下厂房施工期共10级的开挖跟踪反馈分析。结果表明,三大洞室边墙变位均限制在70 mm以内;各洞室边墙处塑性区深度,主厂房控制在4.5 m以内,主变室控制在9.5 m以内,尾闸室控制在11.5 m以内,未发生贯通现象。反馈分析为地下厂房开挖支护提供了重要的参考依据。据此认为,现有条件下地下厂房围岩整体稳定性良好,加固处理措施有效。The underground powerhouse of Huangjinping Hydropower Station on Dadu River is composed of large cavern sys-tem, and the surrounding rock is deteriorated by various faults, and classified as high stress area. According to the monitoring data of 4 sections, tracking feedback analysis was carried out for 10 stages excavation by using 3D nonlinear finite element meth-od. The results show that the side wall deformation of underground cavern does not exceed 70mm, and the side wall plastic depth in main power house, transformer chamber and tailrace sluice chamber is 4. 5, 9. 5, 11. 5m respectively, no penetrative failure is found. The computed results provide important reference for subsequent construction, validating the overall stability of surround-ing rock of the underground powerhouse and effectiveness of the reinforcing measures.

关 键 词：开挖监测 反馈 三维非线性有限元法 地下厂房 

分 类 号：TV731.5[水利工程—水利水电工程]