尾水调压室围岩变形原因分析及加固措施研究  

Study on deformation mechanism and reinforcement measures of surrounding rock of surge chamber

作　　者：程丽娟[1] 侯攀[1] 李治国[1] 

机构地区：[1]中国水电顾问集团成都勘测设计研究院,四川成都610072

出　　处：《人民长江》2014年第8期55-59,共5页Yangtze River

摘　　要：猴子岩水电站厂区处于高-极高地应力区。其电站尾水调压室目前已开挖至中部,现场巡视发现尾调室上游拱肩出现了沿尾调室轴线方向扩展的混凝土喷层裂缝,而1号尾调室端墙和上游边墙则出现了高地应力条件下的岩体剥落、片帮现象。从监测资料和地质资料入手,通过与其他类似工程对比,并结合数值模拟计算和力学分析,指出产生上述破坏的原因主要是地应力偏压导致拱肩应力集中和边墙的水平卸荷与竖向加载所致。依据研究结论对现有支护强度进行了评价,并提出了以提高围压为目的的增加预应力锚索的加固措施。The underground powerhouse of Houziyan Hydropower Station is located in gorge area with high to extremely-high ground stress. At present, the excavation of surge chamber is going to the middle part and some damage phenomena emerge, in-cluding cracks of spraying concrete on the upstream spandrel along the cavern axis, and the splitting failure of surrounding rock on side and end walls. According to the monitoring data and geological data as well as analogical comparison, while combing with the numerical simulation and mechanical analysis, we point out the damages are caused respectively by： stress concentration on spandrel induced by eccentric compression of ground stress, and horizontal unloading and vertical loading of side wall. According to the analysis results, the current support intensity is evaluated and an adaptive reinforcement measure that increases anchor ca-bles to gain confining pressure is proposed.

关 键 词：强度应力比 应力集中 开挖卸荷 加固措施 尾水调压室 

分 类 号：TV732.5[水利工程—水利水电工程]