关键词: 松动爆破, 气-固耦合模型, 数值模拟, 煤层损伤, 降低瓦斯压力

Abstract: For further research on the influence of the blasting effect of gas disaster governance, on the basis of the studies of the xiangshan coal mine, with 21301 tunneling faces as the research object, the establishment of a loose blasting under the action of gas drainage gas recovery - solid coupling model, the effect of the surface loose blasting control the gas on the numerical simulation research results show that the blasting explosive detonation, surrounded by blasting in coal seam drilling dynamic load presents increasing trend, and accompanied by an expansion of the damage area of coal seam, further lead to excavating surface integrity damage of coal seam, the permeability of coal seam After loose blasting, the gas pressure reduction zone generated around the blasting borehole promotes the gas transfer to the surrounding environment and the extraction borehole, so as to achieve the purpose of rapidly reducing gas pressure. Finally, the result of this model is compared with the accumulated gas flow collected on site, verifying the rationality of the gas-solid coupling model of loose blasting.