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

Table 3

The reasonable coal pillar widths between two adjacent drop-shaped gasifier cavities at different temperatures.

Temperatures	20 °C (m)	700 °C (m)	850 °C (m)	1000 °C (m)	1150 °C (m)	1300 °C (m)
The reasonable coal pillar widths	12	17	17	18	19	20