新疆下坂地水库地下电站厂房边坡稳定性分析

下坂地水库电站厂房拟采用地下建设方案,电站厂房处边坡高达1229m,厂房硐室的开挖将不可避免地与所在高陡边坡相互作用,产生影响。本文运用FLAC-3D程序对边坡和电站厂房硐室的相互作用进行了模拟比较,分析表明,硐室开挖前后边坡应力分布状态基本没有差异,而边坡对硐室的影响也不是很大,只产生了厘米级的垂直和水平方向位移。由此得出结论:地下电站厂房建设方案基本不会受到高陡边坡的影响,同时,也不会由于发电硐室的开挖破坏到边坡的整体稳定。但是经过对边坡上部岩体的结构分析,表层可能出现小范围的崩塌、滑动破坏,应采取相应处理措施。

Analysis on the Slop Stability of the Underground Workshop of Xiabandi Reservoir Power Plant in Xinjiang

The proposed power plant workshop of Xiabandi reservoir may be constructed underground,with its upper slope 1229m high.Excavation of the underground workshop will interact with steep and high slope inevitably.Simulation of the interaction of workshop cave and its upper slop is made with the program Flac-3D.Based on stress distribution of the slop,there is no any obvious difference from its original.Therefore,the workshop excavation hardly affects the slop stress distribution.Similarly,the cave is slightly affected by the slop only with several centimeters displacement.Therefore,after the underground workshop construction,the workshop cave and the slope will not interact too much by each other.However,by the structural analysis of upper rock mass of the slope,rock falling and landslide occurs in certain range.It is necessary to take measures to control the falling and sliding.