Study on Micro Seismic Monitoring and Measuring of Coal Pillar Stability

In order to monitor and measure the coal mining face of the mining block in the deep section of Liyazhaung Mine,a SOS monitoring and measuring system was established.A D value theory method was applied to set up 11 monitoring and measuring stations in the mining block of the deep section in Liyazhuang Mine.A underground mine wave velocity measuring method was provided to study overburden strata movement of the coal mining face in the mining block of the deep section in the mine.Under the high stress role,the coal pillar of the coal mining face affected by the mining operations would cause great micro-seismic accidents and unstability of the coal pillars.According to the bedding structures of the overburden strata,a mechanics model of the coal pillar and the roof overburden strata and the failure mechanism of the coal pillar and overburden strata was analyzed.The micro seismic system was applied to monitor and measure the activities of the coal pillar and the strata of the roof and floor and to evaluate the stability of the coal pillar.