某水电站坝址区地应力场分布特征研究

以现场实测地应力资料为依据，结合震源机制解方法，对某水电站右岸实测地应力场进行了分析，拟合了地应力场的数学表达式，并推演研究了工程区域地应力场的分布特征，结果表明：某水电站工程区域位于高山峡谷地带，经历了多次构造运动，地应力场主要受区域构造运动的影响，这种影响对水平方向的构造应力尤为剧烈；工程区域地应力场总体表现为竖直应力略小于自重应力，最大水平主应力以构造应力为主，其值约为20 MPa。

Study on in-situ stress distribution characteristics in dam area of a hydropower station

Based on the measured in-situ stress data and the focal mechanism solution method,the measured in-situ stress field in the right bank of a hydropower station is analyzed and the mathematical expression of the in-situ stress field is fitted.The distribution characteristics of in-situ stress field in the project area are derived.The results show that: the hydropower project is located at the gorge region and has experienced tectonic movements for many times;the in-situ stress field is mainly affected by tectonic movements,and this influence on horizontal tectonic stress is particularly severe;the vertical stress is slightly smaller than the weight stress;the maximum principal horizontal stress is mainly tectonic stress,and its value is about 20 MPa.