Study on the law of disaster caused by multi-field coupling of coal and gas near fault tectonic zone

To explore the multi-field coupling disaster-causing laws near fault tectonic, the multi-physical field evolution characteristics of conventional coal seams and the fault-containing coal seams were compared and analysed, and the energy change laws during the mining process of fault-containing coal seams were investigated. The findings reveal that compared to conventional coal seams, stress concentration and gas accumulation inside fault-containing coal seams were more significant. Elastic energy and gas expansion energy dominate the evolution of the outburst process. Elastic strain can lead to an increase in gas expansion energy within the coal seam. The proportion of free gas expansion energy in the total energy is relatively small, and its contribution to gas outburst is also relatively small. The key to gas outburst lies in the instantaneous release of a large amount of adsorbed gas expansion energy. The research findings are important for understanding the multi-field coupling disaster mechanism near fault tectonic. [Received: January 4, 2025; Accepted: August 5, 2025]