三轴应力作用下煤体渗流规律实验

为了弄清三轴应力作用下煤体的渗流规律,运用CGMS煤层瓦斯气液相对渗透率测试系统准三轴渗透仪及恒温系统,以山西省沁水煤田阳泉固庄煤矿的煤样为例,进行了如下内容的实验研究:①煤样在相同孔隙压力不同体积应力下煤样的渗透率变化;②相同轴压和围压下不同温度下煤样的渗透率变化。实验结果表明,当孔隙压力不变时,煤体渗透率随体积应力增加呈负指数规律变小;当体积应力不变时,煤体渗透率随着温度的增加而增加。

An experimental study on seepage flow in coal under triaxial stress

In order to study the seepage flow in coal under triaxial stress, the CGMS quasi triaxial permeameter and constant temperature system are used to measure gas/liquid relative permeability of coal. Coal samples from the Guzhuang coal mine in the Yangquan area, Qinshui Coal Field of Shanxi, are selected to perform the following experimental studies:①permeability variation of coal samples under the same pore pressure but different volumetric stress, and ②permeability variation of coal samples under the same axial pressure and confining pressure but different temperature. Coal permeability shows negative exponential decline with the increasing of volumetric stress. In contrast, coal permeability increases with the increasing of temperature when the volumetric pressure keeps constant.