Investigation on Coal Pillar Stability between Different Shapes of Gasifier Cavities under High Temperatures during UCG

Figure 6

Numerical analysis model of surrounding rock stability of in gasifier cavities: (a) force analysis diagram of the traditional rectangular gasifier cavities; (b) numerical model diagram of the traditional rectangular gasifier cavities; (c) force analysis diagram of the drop-shaped gasifier cavities; and (d) numerical model diagram of the drop-shaped gasifier cavities.