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结合某水电站地下厂房区工程地质条件以及实测地应力资料,分析研究了区域初始地应力的影响因素.在各影响因素单独作用下,采用FLAC~(3D)计算程序对建立的三维地质概化模型进行计算,在应力实测值和应力回归值之间建立多元回归模型,通过多元回归分析,求出最优回归系数,从而获得初始地应力场分布规律.为了说明计算范围对初始地应力场的影响,对工程区域分别取大小模型进行计算.数值计算结果表明,对于处于高山地区的工程,地应力回归时要选择大模型.并且使用SPSS(statistical packkage for the social science)软件对应力进行统计分析,可得到工程区域内的初始应力函数.
Combined with engineering geological conditions and measured geostress data of underground powerhouse area of a hydropower station, the influencing factors of initial geostress in the area are analyzed and studied.Under the influence of each factor alone, the 3D geological generalized model , A multivariate regression model was established between the measured stress and the stress regression value, and the optimal regression coefficient was obtained by multiple regression analysis to obtain the initial distribution law of the in-situ stress field.In order to illustrate the influence of the calculation range on the initial geostress field , Respectively, to calculate the size of the project area model.The numerical results show that for the project in the mountains, the selection of large-scale model of the stress in the regression, and the use of SPSS (statistical pack for the social science) software for statistical analysis of stress, The initial stress function in the project area can be obtained.