【作者】 张恩宝； 张建海； 周钟； 唐朝阳； 王仁坤；

【Author】 Zhang En-bao, Zhang Jian-hai,Zhou Zhong, Tang Chao-yang, Wang Ren-kun (Institute of geo-technical engineering, college of water resource and hydro-power, Sichuan University, Chengdu, Sichuan, P.R.China(610065). Chengdu Hydroelectric Investigation & Design Institute of CHECC, Chengdu, Sichuan, P.R.China(6l0072))

【机构】 四川大学水电学院； 中国水电顾问集团成都勘测设计研究院；

【摘要】 本文采用非线性弹塑性有限元法,对锦屏电站左岸导流洞塌方洞段的典型剖面K0+434m进行了精细模拟,研究了开挖过程中不支护与支护后洞周围岩应力应变分布及变化规律、洞周边变形及洞周塑性破坏区范围的变化,分析了局部洞段围岩失稳的成因,结果表明高地应力、洞周层面和裂隙及其特定组合是导致洞周局部不稳定的主要原因, 并预测了洞周可能存在的不稳定部位,进而对拟定的加强支护措施的有效性作出了评价,为支护的优化设计提供依据。更多还原

【Abstract】 A typical section(K0+434m) of left spillway tunnel of JinPing hydro-power station is modeled in detail considering joint distribution using non-linear finite element method. The deformation and stress field during excavation are studied, and the failure zone developed around the cave is analyzed. It is found that the joint distribution and the orientation play as the key reason for the failure of the local area. By studying the failure profile of the cave, the potential unstable regions are anticipated, further more, reinforcement methods are proposed.更多还原