Research Article
Experimental Study on Dynamic Characteristics of Annular Coal Mine Sandstone after Different Temperatures
Figure 7
SEM images of sandstone after different temperatures (×1000): (a) 25°C, (b) 200°C, (c) 300°C, and (d) 500°C.
| (a) |
| (b) |
| (c) |
| (d) |