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

<div>Plastic failure areas of surrounding rock in gasifier cavities with different shapes and pillar widths at room temperature: (a) traditional rectangular gasifier cavities and (b) drop-shaped gasifier cavities.</div>

Geofluids

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Figure 8

Figure 8: Investigation on Coal Pillar Stability between Different Shapes of Gasifier Cavities under High Temperatures during UCG 