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• W4382020610 abstract "Numerical back analysis based on incomplete in situ stress measurements is widely used to estimate the three-dimensional (3D) in situ stress fields of large deep underground caverns. However, the variable collinearity caused by complex geological environments has rarely been considered. This paper proposes a numerical back analysis method for 3D in situ stress fields based on stepwise regression (BSSR). In BSSR, the collinearity between independent variables is associated with the surface topography, and insignificant variables caused by variable collinearity are eliminated through stepwise regression. BSSR was applied to the underground powerhouse of a hydropower station for validation, and the results showed that it can reliably estimate the 3D in situ stress field despite the complex geological environments. Multidimensional mathematical models of in situ stress fields were established with the improved predictive ability and clear physical meaning, which can quantify the contributions of six geological actions and three stress sources. The findings of this study can help with understanding the formation mechanism of in situ stress fields for large, deep underground caverns in complex geological environments and provide a useful reference for optimizing excavation schemes and support designs." @default.
• W4382020610 created "2023-06-27" @default.
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• W4382020610 date "2023-10-01" @default.
• W4382020610 modified "2023-10-15" @default.
• W4382020610 title "Numerical back analysis method of three-dimensional in situ stress fields considering complex surface topography and variable collinearity" @default.
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• W4382020610 doi "https://doi.org/10.1016/j.ijrmms.2023.105474" @default.
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