Abstract
The pillar size has great influence not only on the stability of surrounding rock, but also on the recovery rate of coal resources, which directly affects the economic benefits of coal. According to XiaoMing tiefa coalmining group geological conditions and the use of coal pillar, it adopts field measurement, numerical simulation and theory calculation methods to get small coal pillar width and reasonable wide size of coal pillar. Use rock stratum detect to find out the fissures, faults, broken area; analyze the coal pillar stress and displacement distribution of the different pillar widths (3, 5, 8, 10, 15 and 20m) by FLAC2D simulation of numerical simulation software, determine a reasonable size finally. It provides a guarantee of security for the exploitation of the mine.
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