Experimental investigation of the mechanical characteristics and energy dissipation of gas-containing coal under incremental tiered cyclic loading

The fluid–solid coupled with triaxial servo-controlled seepage experiments of coal containing gas was used to study coal samples from a coal mine in Sichuan Province, China. The mechanical characteristics, seepage laws, energy dissipation, and fracture evolution of raw coal under incremental tiered cyclic loading and different confining pressures were studied. The experimental results show that as the axial stress increases, the axial relative...