中文摘要：

针对煤层注水软化或水力增透技术造成的煤体含水率高,进而影响煤层瓦斯的渗流特性的问题,利用自主研发的MCQ-Ⅱ型煤层瓦斯渗流试验设备,对原煤试件进行了25℃、31 MPa恒定温压条件下含水率（质量分数）分别为0%,2%,4%,6%,8%的瓦斯渗透性试验。研究发现,在恒定温压条件下,煤样渗透率随渗透压的增加而增加,且含水率越高,渗透率随渗透压升高增加越快;瓦斯的启动压力随含水率的增加而增加,在不同的含水率条件下,可测到渗透率的最低瓦斯渗透压力为2 MPa,由于渗透压力较大,渗透过程中的Klinkenberg效应不明显;瓦斯渗透率随含水率的增加呈指数降低,当含水率低于6%时渗透率随含水率增加降低较快,当含水率高于6%时含水率对渗透率的影响程度减弱;在煤体注水过程中,煤体弹性模量会降低,使得煤体在轴向和径向的压缩应变增大,当含水率超过6%后,含水率对于煤体变形的影响减弱,且煤体变形过程中表现出各向异性,轴向应变始终大于径向应变。该结论对于煤层注水或水力压裂后,煤层中瓦斯运移规律变化研究有一定的指导意义。

英文摘要：

In this paper, the experimental study was conducted on coal specimens of large size （100 mm×100 mm×200mm） under the stable condition of temperature and pressure （25℃,31 MPa） with moisture content 0%,2%,4%,6%,and 8%separately, using a new experimental ap paratus MCQ-Ⅱ.The study showed that： Under the condition of 25℃ and the volumetric stress of 31 MPa,the threshold pressure of methane increases with the rise of moisture content, the lowest gas seepage pressure is 2 MPa under different moisture content. Owing to greater seepage pressure, Klinkenberg effect is not obvious;Under the stable condition of temperature and pres sure, permeability of coal increases with increasing seepage pressure and the rising rate of perme ability becomes higher with the increase of moisture content;The gas permeability decreases ex ponentially with increase of moisture content, the increase of permeability is relatively faster when moisture content is below 6%, and it hecomes slower when moisture content is above 6%; The elastic modulus of coal decreases in the process of water injection, since the axial and radial compressive strain increases, when moisture content is above 6%, the influence of moisture content on coal mass deformation becomes weak, and anisotropy decreases in the process, the axial strain is always higher than radial strain. This research is of guiding significance for gas extraction under different moisture content after coal seam water injection or hydraulic fracturing, and it is of higher engineering value.