Aiming at the multi-field coupling process of coalfield fire area development and evolution, this paper analyzes the thermalhydrological-mechanical coupling mechanism and states together with products of coal combustion in different periods. This paper also reveals the disaster mechanism of development and evolution of coalfield fire area as a series of activities: Heat releasing originated from coal oxygen complex chemical reactions and overlying strata collapse made by burn out area, followed by the fracture network formed by cracks in coal and rock mass, which provide circulation channel for oxygen and combustion products, ultimately the expansion of the fire disaster mechanism extending to the deep. Thus, the coupling of the coal fire thermal hydrological mechanical and chemical field is an accelerating nonlinear dynamic cycle process of coal combustion. The results provide a scientific basis for the prevention and control of coalfield fire.

coalfield fire area  /  development and evolution  /  multi-field coupling  /  uncontrolled burning