ABSTRACT
To have better understanding of the interaction mechanism for rock deformation and gas leak flow as well as coal and gas outburst, the testing research on the effect of the effective stress on coal specimen under the action of 3-dimensional compression have been specially designed for this study. The triaxial compression tests to coal specimen containing methane gas are carried out with various confining stress and pore pressures. The result of this test showed that the effective stress coefficient was a bilinear function of variable with overall stress and pore pressure. The empiric function can depict the dynamic deformation behavior of gassy coal under the action of pore pressure and make the numerical simulation approach actual condition more closely.
