金沙江溪洛渡水电站地应力测量

利用1999～2001年在金沙江溪洛渡水电站厂区用水压致裂法先后完成的9个垂直深钻孔平面地应力和8个测点三维应力测量结果，结合河谷地形地貌、构造岩性等资料，对工程区地应力场的基本特征进行了较系统的分析研究，认为电站区最大主应力数值在10～20MPa，方向在NW～NWW间，大致平行于金沙江河流走向，地应力作用以水平为主。随着深度增加，地层平面、三维主应力值均有所增大。本文的研究结果为电站工程设计提供了地应力的基础资料。

Crustal stress measurement in Xiluodu hydro-power station on Jinshajiang River

This paper introduced the results of crustal stress measurement with hydraulic fracturing method including 9 vertical boreholes for planar stress and 8 points (three different direction boreholes each point) for three dimensional stress at Xiluodu hydro-power station on Jinshajiang River from 1999 to 2001. Combined with the information such as terrain, geomorphic feature, geological structures and lithology of the river valley, the stress field's basic character of engineering region was systematically discussed and concluded that the greatest principal stress value was about 10 to 20 MPa with the direction NW to NWW approximately parallel to the flow direction of Jinshajiang River and dominant in planer direction. The values of planar stress and three dimensional stress were all gradually increased with the increasing of stratum depth. The paper provided basic information of crustal stress to engineering design.