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利用试验结果、数值计算结果和理论分析结果综合分析了瓦斯气体在煤体爆破损伤断裂过程中的作用机理。煤体爆破损伤断裂过程包括爆炸应力波作用的初始阶段和爆生气体与瓦斯气体共同作用的后期阶段,瓦斯气体在整个过程中具有积极作用,它能增大爆破损伤程度和爆破裂纹扩展速度。在爆炸应力波作用阶段,瓦斯气体的存在能增大应力波峰值和作用时间,降低拉伸相内应力波衰减速度;在爆生气体作用阶段,瓦斯气体参与爆生气体驱动裂纹扩展,随后瓦斯压力场与爆生气体准静态应力场叠加促进爆生气体驱动裂纹的进一步扩展。
Based on the test results, numerical calculation results and theoretical analysis results, the mechanism of gas in the fracture process of coal blasting is analyzed. The fracture process of coal blast damage includes the initial stage of explosive stress wave and the late stage of synergistic effect between gas and explosive gas. Gas has a positive effect in the whole process, which can increase the degree of blasting damage and the propagation speed of blasting crack. In the stage of explosive stress wave, the presence of gas can increase the peak value and duration of stress wave and reduce the decay rate of stress wave in the extensional phase. In the phase of explosive gas, the gas is involved in the explosion of gas to drive the crack propagation, The superposition of the quasi - static stress field of the gas field and the pressure field will promote the further expansion of the gas - driven crack in the explosive gas.