Repetitive mining subsidence with thick soil layers and steep seam

According to the complex condition of deep excavation in Xinji Mine, FLAC program was carried out for strata movement and surface displacement due to coal extraction by different mining layouts. Experiments show that coal seam sector step order mining comparatively favorable. The earth' s surface damaged structures is comparatively light, it has an lightly influence on each sector and be favorable to the roadway assigned. Similarity simulation test was performed for strata movement and surface subsidence due to coal extraction, direction assimilation of horizontal movement is appeared in earth' s surface, direction dissimilation of horizontal movement on the interface between rock bedding and soil layer is come on the scene. Based on the results of the model test and numerical simulation, the fundamental behavior of related parameters of surface displacement were obtained.