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以焦作矿区赵固二矿采集加工的原煤煤样为研究对象,利用自主研制的含瓦斯煤热–流–固–力耦合实验装置,在考虑吸附变形量、孔隙气体压缩量和温度膨胀变化量的基础上,对煤样渗透率与有效应力之间的变化关系以及煤样中瓦斯运动规律进行实验研究,建立受载煤体渗透率与有效应力关系方程及描述煤层瓦斯非线性渗流规律的运动方程。研究结果表明:(1)渗透率随有效应力增大而呈非线性递减关系,具有负指数变化规律;(2)在围压和轴压固定情况下,研究不同孔隙压力梯度下瓦斯渗流规律,得到瓦斯渗流速度在煤体变形作用下呈现非线性特征,同时将所建方程与实验数据进行拟合,由相关度可知,实验结果与拟合结果相一致,表明所建立的运动方程与研究方法是合理的。
Taking coal samples collected and processed in Zhaoguang No.2 coal mine in Jiaozuo Mining Area as the research object, by using the self-developed experimental device of gas-coal-fluid-solid-solid coupling experiment, considering the amount of adsorption deformation, the amount of pore gas compression and the change of temperature expansion , The relationship between the permeability of coal samples and the effective stress and the gas movement in coal samples were studied experimentally to establish the relationship between the permeability of the loaded coal and the effective stress and to describe the nonlinear gas flow through the coal seams equation. The results show that: (1) permeability decreases non-linearly with the increase of effective stress and has a negative exponential variation; (2) Under confining pressure and axial compression, the gas seepage law under different pore pressure gradients is studied, The result shows that the gas seepage velocity shows a nonlinear characteristic under the deformation of coal and the fitted equation is fitted with the experimental data. It can be seen from the correlation that the experimental results are consistent with the fitting results, indicating that the established equations of motion and research methods Is reasonable.