Research on Creep Model and Delay Instability of Coal-Rock Containing Gas

With the increase of mining depth, the problems of Catastrophe instability caused by creep characteristics of coal-rock are getting more and more prominent. Researching the creep constitutive relation of coal-rock containing gas, and analyzing the mechanism of delay instability have important significance. Based on the nonlinear creep model of aging parameters and principle of effective stress, considering the damage caused by factors of gas flow and gas pressure, we put forward that the TPM model of coal-rock containing gas; Using the principle of minimum potential energy, we analyses the process of delay instability of coal-rock in heading face. The result shows that the larger the initial gas pressure P is, the faster the instability criterion U changes, which means the damage is faster.