Study On Multi-face Mining Subsidence Law In Loess Mountain

Western Loess Mountain is China's major coal production bases, in which coal mining subsidence's research is less at home and abroad, while at the same time surface subsidence caused by multi-face mining rules are more complicated. Therefore, the research is more important significance for Western coal mine production safety and environmental protection.In this paper, the research is Surface Movement rules under N1114 and N1206 Faces Mining at the same time in Ningtiaota coal mine, through the establishment of stations in the top surface Face, data processing and analysis, at last it obtains the surface movement parameters. It bases on the measured data using MATLAB software for least squares data fitting, and identifies the two-face mining's predication model parameters values about probability integral method. In order to know the effect of the terrain,it makes the surface morphology of mountain slope into the forward and reverse slope, convex slope and concave slope in four typical landform model,and obtains varying landforms mining subsidence and deformation distribution curve using numerical simulation software FLAC3 D build a different model, and analyzes the impact of the topographic features for mining subsidence combining the measured data. Meanwhile, it simulates and calculates the working face combined mining subsidence caused, the result reveals the influence of movement and deformation mechanism of overlying rock damage and surface mining in repeating mining. Simulation results are consistent with the measured data analysis.The conclusions showed that the western Loess mountains multi-Face Mining Surface Subsidence Rules become more complex by the overlay impacts of terrain and repeated mining, the surface movement parameters and prediction model parameters that are calculated by measured data have practical value, It can provide a reference for the study of mining subsidence and ground protection under similar conditions.