金安桥水电站上坝址左岸边坡稳定性分析

Left Bank Slope Stability Analysis of the Upper Damsite of the Jin' anqiao Hydropower Project

本文简述了金沙江中游河段金安桥水电站预可行性研究阶段初拟坝址为上坝址。在分析研究上坝址基本地质条件的基础上，提出了坝址的主要工程地质问题─—左岸边坡稳定性。并对左岸边坡稳定性影响最大的Fc层间错动软弱带从其物质组成、上下盘微构造特征、河流阶地对比、边界条件分析和上盘岩体稳定性计算等方面论证其稳定性；同时简述了坝址上游左岸B1崩塌堆积体的稳定性及对边坡的影响。从而对坝址建坝的工程地质条件作出评价。

This paper gives a brief presentation of the upper damsite which has been proposed inthe pre - feasibility study stage of the Jin' anqiao Hydropower Project located on the middle reachesof the Jinsha fover, and puts major engineering geological problems existing at the damsite based onthe analysis and study of the basic geological conditions at the upper dareite. The paper identifiesthe left hank slope stability in terms of the composition of the matters distributed along the Fc faultsoft zone whch would exert the greatest impact on the stability, the micro - structural characteristicsof its upper and lower parts, the river terrace comparison, the boundary condition analysis as well asthe stability calculation of the upper part rockmass - The paper also makes a description of the stability of the B1 avalanche zone on the left bank upstream from the damsite and of its influence on itsslope stability, The paper finally makes an objective appraisal of the engineering geological conditions at the damsite for the mpse of dam construction.