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基于摩尔-库伦屈服准则构建了煤岩体弹塑性损伤本构模型,以损伤变量为过渡变量构建了采动条件下煤岩体渗透率-损伤演化方程,运用采动岩体力学、渗流力学、损伤力学等理论建立了采动煤岩体瓦斯渗流-应力-损伤耦合模型,采用FLAC3D软件设计出采动煤岩体瓦斯渗流-应力-损伤耦合计算程序,将所建立的采动煤岩体瓦斯渗流-应力-损伤耦合模型对顾桥煤矿远距离保护层开采下的瓦斯渗流规律进行了数值模拟研究。结果表明,受采动影响被保护层透气性系数为原始透气性系数的1 760倍,瓦斯压力由原来的2.8 MPa降低到0.6 MPa,消除了被保护层的煤与瓦斯突出危险性。
Based on the Mohr-Coulomb yield criterion, the elastoplastic damage constitutive model of coal and rock mass is established, and the permeability and damage evolution equations of coal and rock mass under mining conditions are constructed using the damage variables as transitional variables. By using the mechanics of the rock mass, seepage mechanics, Damage mechanics and other theories, a coupled model of gas seepage, stress and damage of coal and rock mass is established. The FLAC3D software is used to design the coupled program of gas seepage, stress and damage of coal and rock. The established coal and rock mass gas Seepage - stress - damage coupling model of the Guqiao Coal Mine long distance protective layer mining under the law of gas seepage flow numerical simulation study. The results show that the permeability coefficient of the protective layer influenced by mining is 1 760 times of that of original permeability, and the gas pressure is reduced from 2.8 MPa to 0.6 MPa, which eliminates the danger of coal and gas outburst in the protected layer.