长江葛州坝库区及邻近三维有限元计算与解释

THE COMPUTATION AND ANALYSIS OF THREE DIMENSIONAL STRESS FIELD IN THE GEZHOU DAM RESERVOIR AND ITS NEIGHBORHOOD BY USE OF THE FINITE ELEMENT METHOD

本文介绍了研究地区所选用的三维应力场有限元法计算的力学模型、单元和块体的划分及其介质参数的确定;从三维位移和应力数值解中获得,位移和应力最大值不是处于库区中心部位,而是在它的附近;库区及其边缘上层区域呈现压应力为主,外围与底层拉应力占优势,其间,深在3—5公里间有一层水平位移和应力为零的转换带。认为这一层面与诱发水库地震有关。

The this paper, we discussed the force-model, the division of the units and block, and the determenation of the medium paraments in the finite element method. According to the results of three-dimension (3D) displacements and 3D stress, we found that the maximum of displacements and stress is not in the reservoir region center, but it is in the neighbouhood of reservoir region, and the compressive stress are mainly presented on the reservoir region and the upper of it's edge, the tensile stress are mainly presented on the outside and the bottom of the region. Moreover, betweem the depth 3km to 5km, there is one transform belt on which the stress and the horizontal displacements are zero, and we considered this belt can relate to the induced earthquake in reservoir.