卸围压作用下原煤渗透特性试验研究
Experimental Study on Seepage Properties of Raw Coal under Unloading Confining Pres-sure
DOI: 10.12677/ME.2018.62010, PDF,    科研立项经费支持
作者: 张东明*, 杨玉顺, 薛燕光：重庆大学，煤矿灾害动力学与控制国家重点实验室，重庆;重庆大学，资源及环境科学学院，重庆；杨 松, 孙文德：四川芙蓉集团实业有限责任公司杉木树煤矿，四川 宜宾
关键词: 卸围压；含水率；渗透率；含瓦斯煤；试验研究；Unloading Confining； Moisture Content； Permeability； Coal Containing Gas； Experimental Research
摘要: 利用自行研制的含瓦斯煤热流固耦合三轴伺服渗流试验装置，以川煤集团杉木树煤矿2 + 3#煤层制作的原煤样为研究对象，进行不同瓦斯压力和不同含水率卸围压条件下(固定轴压卸围压)含瓦斯煤渗透特性的试验研究，研究结果表明，随着围压的卸载，煤样孔隙缓慢张开，孔隙率增大，气体通过煤样能力增强，煤样渗透率逐渐增大，且煤样渗透率与围压呈负指数函数关系；卸围压初期煤样渗透率随瓦斯压力的增加逐渐增大，随含水率的增加呈波动状减小；瓦斯压力越大，煤样渗透率越高。含水率越大，煤样渗透率越低；卸载过程中煤样径向应变逐渐恢复呈上凸型缓慢增大，加卸载过程中煤样泊松比随径向应变的增加呈下凸型减小。
Abstract: Based on the “THM coupled with servo-controlled seepage apparatus for containing-gas coal”, per-formed on raw coal samples of 2 + 3# coal seam in Shamushu coal mine, Sichuan coal group as the research object, an experimental study was carried out to investigate the permeability property with different gas pressure and different moisture content; these tests include fixed axial stress and unloading confining stress. The results show that, with the unloading confining pressure, the pores of coal samples open slowly, the porosity increases, the gas permeability increases, and the permeability of coal sample increases gradually, and the relationship between permeability and confining pressure is negative exponential function. The permeability of coal samples increases with the in-crease of gas pressure, and decreases with the increase of moisture content in early stage of unloading confining pressure. The higher the gas pressure, the higher the permeability of coal samples. The greater the water content, the lower the permeability of coal samples. During the unloading process, the radial strain of coal sample gradually recovers and increases gradually, and the Poisson’s ratio of coal sample decreases with the increase of radial strain during loading and un-loading
文章引用：张东明, 杨玉顺, 杨松, 孙文德, 薛燕光. 卸围压作用下原煤渗透特性试验研究[J]. 矿山工程, 2018, 6(2): 69-77. https://doi.org/10.12677/ME.2018.62010

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