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为从细观结构层次上研究立井揭穿高瓦斯深埋煤层时围岩的力学特性,利用基于含瓦斯煤岩破裂过程固-气耦合动力学模型开发的RFPA2D-Flow软件,对立井揭煤时围岩的应力演变,瓦斯压力梯度场发展,瓦斯运移规律进行了数值模拟研究,对揭煤时煤与瓦斯突出过程从细观上进行了再现。数值模拟结果表明高地应力、高瓦斯含量和梯度、较厚的松软煤体综合影响立井揭穿高瓦斯深埋煤层时的力学特性并增加了煤与瓦斯突出的危险性。
In order to study the mechanics characteristics of the surrounding rock when exposing vertical well with high gas and high gas from the meso-structure level, RFPA2D-Flow software based on the solid-gas coupling dynamics model of coal and rock fracture is introduced. The stress evolution of rock, the development of gas pressure gradient field and the law of gas migration were studied numerically. The process of coal and gas outburst in coal uncovering was reproduced from the meso perspective. Numerical simulation results show that high ground stress, high gas content and gradient, thicker and softer coal comprehensively affect the mechanical properties of vertical well exposed to high gas and deep coal seam and increase the danger of coal and gas outburst.