Experimental Study on Physicomechanical Properties of Deep Sandstone by Coupling of Dry-Wet Cycles and Acidic Environment

Figure 14

BSE image of specimens in different A-D-W cycle stages (at pH = 4): (a) Stage I, (b) Stage II, (c) Stage III, and (d) Stage IV.

(a)

(b)

(c)

(d)