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为有效预测与防治瓦斯煤层冲击地压,揭示瓦斯煤层冲击地压发生机理,建立了发生判据,并对瓦斯煤层冲击地压与煤和瓦斯突出的区别进行了阐述。瓦斯煤层冲击地压是在地应力和瓦斯孔隙压力综合作用下发生的,是固流耦合作用下发生的煤层冲击地压。瓦斯煤层变形破坏受有效应力的支配,孔隙压力抵消了部分地应力作用。由于瓦斯对煤物理力学性质影响,既有减缓冲击地压强度的趋势,又有增加冲击地压频度的趋势。瓦斯煤层冲击地压与煤和瓦斯突出的孕育过程是相似的,但发生过程和能量来源有很大区别。
In order to predict and control the impact pressure of gas and coal seam effectively and reveal the mechanism of rockburst in gas and coal seam, the criterion of occurrence is established and the difference between gas and coal seam rock burst and coal and gas outburst are described. The coal seam bursting pressure of gas is produced under the combined effect of geostress and gas pore pressure, which is the coal seam bursting pressure that occurs under the action of solid-fluid coupling. The deformation and failure of gas coal seam are dominated by effective stress, and the pore pressure counteracts the part of the stress. Due to the influence of gas on the physical and mechanical properties of coal, it not only reduces the tendency of rock burst strength but also increases the frequency of rock burst. Gas coal seam rockburst is similar to that of coal and gas outburst, but the process of occurrence is quite different from that of energy source.