Optimization inversion analysis of a geo-stress field in a deep mine area: a case study.

The characteristics and evolution of the geo-stress field are the research bases of overburden migration, roadway surrounding rock stability, and dynamic disaster prevention in deep coal mines. However, the present understanding of mine geological stress mainly depends on measurements obtained at a few discrete points, leading to obviously insufficient knowledge of the geo-stress field in the whole mining area. In this study, a novel optimal inversion analysis model of the geo-stress field was established based on multiobjective constraint technology, solid mechanics, optimization analysis, and stress inversion theory. Then, a 3D numerical simulation analysis model with large-scale general finite element software as the solver was constructed for the optimization of the boundary conditions of the geo-stress field. This simulation model identified the key links between the stress field boundary loads and the actual measurement data by directly solving the multiobjective optimization problem. Six on-site measurement points were selected at the Xinji No. 1 mine, and the magnitude and orientation of the geo-stress at these points were measured with the hollow inclusion strain gauge method. The distribution of the geo-stress and the main influential factors were then analyzed numerically. The results of the study are of great significance for investigating the geo-stress distribution. [ABSTRACT FROM AUTHOR]