煤体有效应力规律的实验研究

Experimental Research on the Rule of effective stress on Coal Body

通过不同围压、不同孔隙瓦斯压力下煤的三轴压缩试验结果，证明了等效孔隙压力系数（α）是体积应力与孔隙压力的双线性函数。该经验函数能较好地描述含气煤体在孔隙压力作用下的力学变形性态，使固气耦合问题的数值分析更逼近实际。

Abstract The result of triaxial compression test of coal under different surrounding pressures and porous gas pressures showed that equivalent porous pressure coefficient (d) was a bilinear function of volume stress and porous pressure. The empiric function can depict the dynamic deformation behavior of gassy coal under the action of porous pressure and make the numerical analysis approach actual condition more closely.