Application of Multivariate Linear Regression to Initial Geostress Filed in Small Range

Generally large enough calculation range is needed to reduce differences between simulation and test results during combining load cases in initial geostress field analysis with multivariate linear regression method.In smaller simulation area,initial stress field is combined and boundary condition is applied to balance the internal stress of the model.And then the balance analysis of geostress is conducted with ABAQUS.The results show that the influence of boundary condition on stress field is eliminated and high fitting accuracy is obtained.The method can be directly used to analyze initial stress field in project,which provides reference for engineering application.