Study on Numerical Simulation of Rational Width of Section Coal Pillar

Based on the engineering geological conditions of Qin Yuan Coal-mining Company,this paper analyzed the stress distributions and the failure characteristic of the surrounding rocks of section coal pillar through FLAC3D establishment mining model.The analysis results showed that in the actual load bearing capacity scope of coal pillar,vertical stress increases gradually with the reduce of coal pillar width when the coal pillar is in ultimate limit state,the coal pillar is damaged and loses carrying capacity.The dimension of section coal pillar is 13m at last.This method provides an important basis to the following coal seam mining in design of width of section coal pillar.