摘要
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K0+434 m的典型剖面进行了精细模拟,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,分析结果表明高地应力、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。
A typical section（K0 ＋ 434m） of the left diversion tunnel of the Jinping hydropower project is modeled in detain 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 its orientation proved the basic cause of the failure of the local surrounding rock. By studying the failure profile of the cave, the potential unstable zones are anticipated. Furthermore, the support strengthening methods of the sections are proposed.
出处
《云南水力发电》
2006年第4期40-44,共5页
Yunnan Water Power
关键词
锦屏电站
左岸导流洞
支护
有限元法
岩体变形
失稳模式
Jinping hydropower project
left diversion tunnel
support
finite element method
deformation
failure - mode
作者简介
张恩宝（1979-），男，河南灵宝人，在读硕士研究生，主要从事岩石力学数值分析与模拟工作。
