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针对含瓦斯煤渗透率与温度变化关系,基于物理实验和数值模拟对比研究了温度变化对煤样瓦斯渗流的影响,通过对煤样的瓦斯渗流特性的深入的分析,得到以下结论:通过应力场-温度场-渗透率的实验研究,煤样渗透率随温度升高而下降,其变化曲线呈“S”型曲线;煤样渗透率随温度变化曲线可分为5个阶段,分别为缓慢下降阶段、加速下降阶段、减速下降阶段、二次加速下降阶段、平缓阶段;温度T=25~80℃的范围内,煤样渗透率随温度变化的幅度是随着轴压围压的增大而升高的;利用数值模型可以很好的对热力耦合情况下的煤岩的渗流特性进行计算模拟,其数值模拟结果与物理实验结果的吻合度较高。
According to the relationship between gas permeability and temperature in gas-containing coal, the influence of temperature on gas seepage in coal samples was studied based on physical experiment and numerical simulation. Through the deep analysis of gas seepage characteristics of coal samples, the following conclusions were obtained: - temperature field - permeability experiment, coal permeability decreases with increasing temperature, the curve is “S ” curve; coal permeability with temperature curve can be divided into five stages, respectively In the range of T = 25 ~ 80 ℃, the permeability of coal sample with temperature changes with the increase of axial pressure Large and high. The numerical simulation can well simulate the seepage characteristics of coal and rock in the case of thermal coupling, and the numerical simulation results are in good agreement with the physical experiment results.