Study on coal and rock gas dynamics disaster prevention and control in deep mine

According to the prevention and control problems of the coal and rock gas dynamics disaster, a comprehensive accident investigation, theoretical analysis and site measurement method were applied to study the occurrence mechanism, the prevention and control technology and the danger section and grade evaluation method of the coal and rock gas dynamics disaster in the deep mine. The results showed that,the induced factors of the coal and rock gas dynamics disaster mainly were the inherent outburst and the impact attribute of the coal and rock, geostress, mining depth, active geological structure, external dynamic triggering, mining technical condition as well as the those factors composited. The occurrence mechanism of the coal and rock gas dynamics disaster was the broken and ejection of the coal and rock under the joint function of the elastic energy and the gas inner energy. The prevention and control method of the coal and rock gas dynamics disaster was to conduct the evaluation before the mining operation, to pre-treat the danger area and to conduct the danger monitoring of the dynamics disaster during the mining process. The pressure released with the pilot borehole, the enhanced local gas drainage, seam water injection, pressure released blasting and improved roof support were applied to reduce the danger. The study results were applied to No. 17200 coal mining face in a coal mine with an excellent effect and could effectively prevent and control the coal and rock gas dynamics disaster.