煤样全应力应变过程中的渗透系数——应变方程

借助现代化的电液伺服岩石力学试验系统，以数控瞬态渗透法进行了全应力应变过程的软煤样渗透特性试验，实验中首次设置了向应变传感器，得出煤样渗透性与主应力差，轴应变，体积应变关系曲线，并拟合出相应方程，从可可知，煤样全应力应变过程对应的渗透系数是体积应变的双值函数，体积缩小时为2次多项式，体积膨胀时为5次多项式，该方程在应力场－渗流场耦合的数值分析中，可使计算结果更符合工程实际。

Permeability-strain equation relation to complete stress strain path of coal sample

With the Electro hydraulic Servocontrolled Rock Mechanics Testing System,the permeability of soft coal sample related to complete stress strain path is experimented with instantaneous permeating method of data auto control.An annular strain sensor is set up firstly in testing,and the curves,reflecting the relationship between permeability of coal sample and principal stress difference,axial strain and volumetric strain,as well as the relevant equations are established.Thus it can be seen the coal sample permeability coefficient is twofold function of volumetric strain.It is binomial equation when the sample volume decreased,and five polynomial one when the volume increased.The equation can be applied to the numerical analysis of the coupled stress field and the fluid flow field,and the calculated results agree well with those observed.