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针对煤体非均匀性Weibull分布理论和气固耦合的问题,利用RFPA~(2D)—GasFlow数值模拟系统,结合煤体中应力分布情况和突出破坏结果,分析不同透气性煤体瓦斯突出的破坏机理。研究结果表明:透气性小于0.01 m~2/(MPa~2·d)时,煤体发生拉伸破坏,产生规模较大的瓦斯突出,形成一定形状的突出孔洞,瓦斯在突出中起主导作用;透气性系数为1 m~2/(MPa~2·d)时,煤体发生拉伸破坏,形成突出,此时剪切应力和瓦斯在突出中所起的作用相当;透气性大于10 m~2/(MPa~2·d)时,煤体发生剪切破坏,剪切应力在突出中起主导作用。
According to the Weibull distribution theory and gas-solid coupling problem of heterogeneity of coal body, the failure mechanism of gas outburst with different gas permeability was analyzed by using RFPA 2D Gas-flow numerical simulation system and combining the stress distribution in coal body with the result of prominent failure . The results show that when the gas permeability is less than 0.01 m 2 / (MPa ~ 2 · d), the coal body undergoes tensile failure and produces large-scale gas outburst, forming protruding holes of a certain shape. The gas plays a leading role in protrusion ; When the permeability coefficient is 1 m 2 / (MPa 2 d), the coal body will be tensilely destroyed and formed prominence, at this time, the shear stress and gas play the same role in the protrusion; the permeability is more than 10 m ~ 2 / (MPa ~ 2 · d), shear failure of coal occurs, and shear stress plays a leading role in the protrusion.