温度对瓦斯流动及全过程煤体变形的影响研究

Study on effect of temperature on gas flow and coal deformation in whole process

为揭示不同温度下瓦斯吸附-解吸-渗流全过程煤体变形的差异性,应用自主研发的煤体瓦斯流固耦合试验系统,研究三轴应力加载下瓦斯吸附-解吸-渗流及全过程煤体变形随温度变化的响应特征。试验结果表明:瓦斯吸附阶段,煤体变形量与吸附时间呈Langmuir型上升变化;瓦斯解吸阶段,煤体变形量与解吸时间呈指数型衰减趋势;瓦斯渗流阶段,煤体变形量与时间呈幂函数上升趋势。瓦斯吸附量、渗透率及过程中煤体变形量均随温度升高而降低,瓦斯解吸率随温度升高而增大;煤体变形量与瓦斯吸附量、解吸量、渗透率呈正相关关系。温度效应对全过程煤体变形具有显著影响。

In order to reveal the difference of coal deformation in the whole process of adsorption-desorption-seepage under different temperatures,the self-developed coal-gas fluid-solid coupling experimental system was used to carry out the experiment on the response characteristics of gas adsorption-desorption-seepage and coal deformation in the whole process with various temperature under triaxial stress.The experimental results show that the gas adsorption,permeability and coal deformation in the process all decrease with increasing temperature,and the gas desorption rate increases with increasing temperature.Coal deformation is positively correlated with gas adsorption,desorption and permeability.During the gas adsorption stage,the coal deformation shows a Langmuir-type upward change with adsorption time.In the gas desorption stage,the coal deformation shows an exponential decay trend.And in the gas seepage stage,the coal deformation shows an upward trend of a power function.The temperature effect has a significant influence on the coal deformation in the whole process.