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为研究瓦斯在煤层裂隙中流动规律以及瓦斯渗透率变化,使用含瓦斯煤热流固耦合实验系统对含有贯穿裂隙的煤样进行了瓦斯渗流实验。通过改变煤样两端瓦斯压力差,得到了瓦斯渗流速度和煤样两端瓦斯压力差之间的关系,求解出各瓦斯压力条件下的渗透率,然后对试验数据拟合,分析渗透率变化的原因。研究结果表明:含贯穿裂隙煤样瓦斯渗流速度随煤样两端瓦斯压力增大呈抛物线关系增加;在外载应力作用下,瓦斯在煤层裂隙中流动存在滑脱效应;随着瓦斯压力差的增大,滑脱渗透率对气测渗透率贡献率也在增大。
In order to study the gas flow in coal seam fissures and the change of gas permeability, gas seepage experiments were performed on coal samples containing through-fractures using gas-coal-thermal-fluid-solid coupling experimental system. By changing the gas pressure difference between the two ends of the coal sample, the relationship between the gas seepage velocity and the gas pressure difference between the two ends of the coal sample is obtained, and the permeability under each gas pressure condition is obtained. Then the experimental data are fitted and analyzed. s reason. The results show that the gas seepage velocity through the fractured coal samples increases parabolically with the increase of the gas pressure at both ends of the coal sample. Under the external load stress, the gas flow in the coal seam cracks has the effect of slippage. With the increase of the gas pressure difference , The contribution rate of slippage permeability to gas permeability is also increasing.