Gas Expansion Energy Model and Numerical Simulation of Outburst Coal Seam under Multifield Coupling

Figure 2

Distribution cloud map of physical field in front of working face.

(a) Vertical stress, Pa

(b) Volumetric strain

(c) Plastic strain

(d) Gas pressure in fracture, Pa

(e) Gas pressure in matrix, Pa

(f) Permeability, m²