多元多方程地应力反演与工程应用研究

在分析某水电站地下厂房区工程地质条件以及实测地应力的基础上,借助有限元计算工具MATLAB,对各影响因素共同作用下的三维地质模型进行了计算。通过分析各测点的实测值与回归值之间的数值关系,建立了多元回归模型,求出最优回归系数,从而获得初始地应力场的分布规律。首次考虑了各应力分量之间的联系与相互独立性,得到了更合理的应力场分布。结果显示实测点处地应力的计算值与实测值吻合较好,表明经过回归得到的地应力场是合理的。

Inversion of an initial geostress field by the method of multivariate analysis and the research of engineering application

Based on engineering geological conditions and measured data of the geostress at a hydropower station, 3D geological models under each affecting factor were calculated by means of finite element computing tools and MATLAB. A multivariate regression model was created between the measured and calculated value of geostress at measurement points, and the optimal regression coefficient of the model was found. Consequently, the distributions of initial geostress of this area were obtained. This was the first attempt to take into account the independence and internal relations among each stress component. Thus,  more reasonable distributions of initial geostress of this area were obtained. The result indicated that the 3D calculating geostress field was reasonable.