The Experimental Research on the Effect of Gas on Mechanical Properties and Mechanical Response of Coal

In this paper,triaxial compression tests are carried Out with various confining pressure and pore pressure.The results proved that the mechanical properties and mechanical response of gas-absorbent coal are influenced bothby absorbed gas and free gas. One of the influence is the mechanical effect of gas prereure as body force,and theother is the non-mechanical effect of absorption and deserption of gas.Therefore,in the study of the mechanismof out bursts and gas flowing in mined coal seams,both the mechanical and non-mechanical effects of gas on themechanical response must be considered.