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根据三向应力状态、有压瓦斯流过煤试样的荷载-卸载实验结果,定义了卸载弹性系数E′和煤层卸载瓦斯渗透率K′,讨论了卸载过程中煤的弹性能量释放和瓦斯流动问题。根据弹塑性不完全闭合采空区模型的计算结果,分析了上保护层开采后,下部煤(岩)层中的应力分布,提出了以始突深度为基准圈定有效保护范围的方法。
According to the three-way stress state, the load-unloading experiment results of pressurized gas flowing through the coal sample, the unloading elastic coefficient E ’and the unloading gas permeability K’ are defined, and the elastic energy release and gas flow during coal unloading are discussed problem. According to the calculation results of the incomplete plastic goaf model, the stress distribution in the lower coal and rock layers after the upper protective layer mining is analyzed, and the method of delineating the effective protection range based on the initial protrusion depth is proposed.