Experimental study on creep mechanics characteristics of gassy under disturbance conditions

Abstract

Creep mechanics characteristics of large scale tectonic coal was studied under gas draingae and disturbance conditions by using the new self-developed coal gas coupling three axial creep equipment. The results show that when σ 1 is smaller, σ 3 is larger, gas pressure and disturbance load are smaller, gassy coal has no disturbance to creep. When σ 3 is smaller, gas pressure and σ 1 are larger, disturbance load is constant, gassy coal has remarkable effects of disturbance to creep. The concepts of disturbance load sensitive domain and disturbance creep sensitive domain were put forward. Under same amplitude disturbance stress condition, blasting disturbance has a stronger influence on gassy coal deformation is related to frequency of disturbance load; gas drainage, blasting excavation and mining play an important role in coal-gas outbursting. The relationship of gassy coal creep and gas pressure gradient, the creep constitutive equation built with gas pressure gradient and disturbance load as independent variables within the framework of fluid-solid two phases coupling were established.