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

Figure 11

Plastic failure areas of the drop-shaped gasifier cavities for different coal pillar widths under different high-temperatures: (a) 700 °C; (b) 850 °C; (c) 1000 °C; (d) 1150 °C; (e) 1300 °C.

(a)

(b)

(c)

(d)

(e)