The Layout of the Combustion Cavity and the Fracture Evolution of the Overlying Rock during the Process of Underground Coal Gasification

<div>The influence of different principal stress orientations on the rupture characteristics of the combustion cavity: (a) condition (1) and (b) condition (2).</div>

Geofluids

fig5

Figure 5

Figure 5: The Layout of the Combustion Cavity and the Fracture Evolution of the Overlying Rock during the Process of Underground Coal Gasification 