不同温度下含瓦斯煤岩体的多场耦合数值模拟

考虑地温变化对煤矿深部开采岩石变形破坏的影响,利用COMSOL软件建立含瓦斯煤岩体热-流-固耦合数值模型,并对掘进面进行数值模拟,研究不同温度条件下瓦斯压力、瓦斯渗流速度、煤岩体位移的变化情况。结果表明:温度变化不大的情况下,掘进工作面的瓦斯浓度随温度变化不明显;煤壁工作面附近的瓦斯压力梯度增大。其他条件不变的情况下,随着温度升高,渗流速度不会发生明显变化。该研究为含瓦斯煤岩体动力灾害预测提供了参考。

Multi-field coupling numerical simulation of coal and rock containing gas under different temperature

This paper is focused specifically on the application of COMSOL software to investigate the development of a heat-flow-solid coupling numerical model for coal and rock containing gas-a model which gives due consideration to the influence of ground temperature change on the deformation and fail- ure of rocks in deep coal mining. The investigation is accompanied by the numerical simulation on exca- vation face and the study of the changes occurring in the gas pressure, the gas seepage velocity and dis- placement of coal and rock due to exposure to different temperature conditions. The results suggest that the heading faces exposed to small changes in temperature tend to experience no significant change in gas concentration following the change in temperature; an increase occurs in the gas pressure gradient near the coal winning working face ; the absence of changes in other conditions means no obvious change in the seepage despite an increasingly higher temperature. This study may provide a reference for predicting dynamic disasters of coal and rock containing gas.