Abstract
On the premise that the point of the maximum abutment pressure is the demarcation point of gas migration, an experimental research was conducted on gas-bearing coal by using a thermo-fluid–solid coupling test system. The research results demonstrate that irreversible strain and elastic modulus increase with increase in unloading level. The damage variable defined based on change laws of permeability rises with unloading level. More importantly, the evolution process of coal-and-gas outburst according to gas migration laws of each structure can be re-described after the gas migration laws are structured from the perspective of permeation, and the corresponding criteria for initiation of outburst are established. Besides, the factors influencing outburst can be classified into basic, key and induction factors. The basic factors degrade the strength of coal mass, the key factors make coal and rock mass to be a critical mechanical equilibrium state, and the induction factors break through such an equilibrium state and induce outburst.
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