天生桥二级水电站厂房高边坡地应力测量与分析

Measurement StressAlong Edge Slope in the Site of the Tiansheng Bridge Second Degree Hydropower Station and Analysis Edge Slope

一、引言天生桥二级水电站装机容量132万千瓦,是广西、贵州两省交界红水河上游建设中的大型水电站之一。电站处在深山狭谷,具有引水洞长、洞径大、落差高、埋藏深等特点。电站区域地质构造复杂,尤其是厂房附近的高边坡,坡度陡,对厂房安全影响大。为了解高边坡岩体的应力状态,我们用套芯法在其岩体中进行了3个点的应力测量,结果表明主应力方向为N59°W,与滑坡体方向一致,最大主应力达20MPa,应力值分布具有分带性。二、厂房边坡地质构造概况 1.

This paper presents the result of in-situ stress measurement along the edge slope in the site of the Tiansheng Bridge second degree hydropower station. The direction of the compressive stress is striking NW59°. The dip-angle is 12°. The direction of dip is tothe bed of the river. The value of the maximum compressive stress is about 20 MPa. The above stress condition in the site along edge slope is considered to be a combination of the tectonic stress and gravitational stress. After opening the edge slope of the site, We found the stress in rock is basically affected by the valley and the landform of the engineering excavation.