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通过煤与瓦斯突出模拟实验,研究了突出过程中瓦斯压力的变化规律,分析了突出过程中瓦斯对煤体的破坏作用。研究发现:应力和瓦斯压力达到一定梯度才能引起煤与瓦斯突出,突出的发动明显滞后于卸压过程;突出发生时,瓦斯压力的变化有明显的规律性,瓦斯压力变化形态呈现出突然降低、快速升高并波动、达到波动峰值后逐渐降低,瓦斯压力的变化形态与突出发展的演化过程有较好的对应性;压出与突出过程中的瓦斯压力变化形态有显著差异。煤体在应力和瓦斯压力差的作用下发生剪切和拉伸破坏,靠近卸压口处的煤体层裂破坏特征明显。
Through the simulation experiments of coal and gas outburst, the variation law of gas pressure during the salient process was studied, and the destructive effect of gas on coal during the salient process was analyzed. The results show that when the stress and gas pressure reach a certain gradient, the coal and gas can be caused to protrude, and the outstanding start obviously lags behind the pressure relief process. When the outburst occurs, the gas pressure has obvious regularity and the gas pressure changes suddenly, Rapidly rising and fluctuating. After reaching the peak of fluctuation, the pressure drop gradually decreases. The variation pattern of gas pressure has a good correspondence with the evolution process of salient development. There are significant differences in the gas pressure changing patterns between the extrusion and salient processes. Under the action of stress and gas pressure difference, the coal body is sheared and tensile damaged, and the crack characteristic of coal layer near the pressure relief port is obvious.