Seismic Dynamic Response of Goaf in Near-Fault Coal Seam Mining and its Influence on Surface
In order to study the seismic dynamic response of goaf in near-fault coal seam and its influence on the surface,taking Luyukou Coal Mine in Shanxi Province as the engineering background,based on engineering wave theory,a three-dimensional numerical model was established using MIDAS GTS NX finite element software combined with geological environmental conditions.Nonlinear time history analysis method was used to calculate and analyze the acceleration response law,displacement variation law and plastic zone distribution of free site and near-fault coal seam mining site.The research results indicate that under the action of shear seismic waves,the presence of goaf will reduce the peak horizontal acceleration above it and change the surface dynamic response characteristics.Cracks will form between the goaf and the fault in a very short period of time,and the expansion of the cracks will lead to the continuous aggravation of the goaf,resulting in surface deformation.Compared to free sites,after mining,the exposed surface rock layers of the footwall quickly develop cracks and connect along the weak layer,resulting in greater displacement response and causing disasters such as surface collapse and landslides.The research results can provide a certain reference basis for the scientific prevention and control of coal mine seismic dynamic disasters.
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