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针对含瓦斯构造煤渗透率与温度变化关系,利用自主研发的含瓦斯煤岩热-流-固耦合三轴渗流试验装置,开展不同应力条件下含瓦斯构造煤原煤样的渗透率与温度变化的试验研究。试验结果表明:(1)在试验温度变化过程中,构造煤样渗透率随温度升高而降低,渗透率与温度变化呈现负指数函数分布规律;(2)在试验温度变化过程中,构造煤渗透率损失率与有效应力符合Boltzmann分布,渗透率损失率存在有效应力门槛值大约为4.515 MPa。渗透率变化主要分为渗透率加速变化与平稳变化两个阶段,构造煤样渗透率从加速阶段过渡到平稳变化温度大约为45℃;(3)在温度21~80℃范围内,渗透率敏感性系数数量级为10~(-2),温度变化对构造煤样渗透率影响不显著。同时,有效应力的增加使得温度敏感性系数降低。
In view of the relationship between permeability and temperature of gas containing coal, using the self-developed gas-rock-coal-rock thermal-fluid-solid coupling three-axis seepage test device, the permeability and temperature of coal samples with gas-bearing coal under different stress conditions Experimental Research. The results show that: (1) During the test temperature change, the permeability of tectonic coal samples decreases with the increase of temperature, and the distribution of permeability and temperature shows a negative exponential function. (2) During the test temperature change, Permeability loss and effective stress are in accordance with Boltzmann distribution. The effective stress threshold of permeability loss is about 4.515 MPa. The change of permeability is mainly divided into two stages: acceleration and steady change of permeability. Permeability of tectonic coal sample changes from acceleration stage to stable change temperature is about 45 ℃. (3) Permeability is sensitive at temperature range of 21-80 ℃ The magnitude of sex coefficient is 10 ~ (-2), and the influence of temperature on permeability of tectonic coal sample is not significant. At the same time, the increase of effective stress decreases the temperature sensitivity coefficient.