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

Table 9

W value in different situations.

pH	4	5	6	7
Stage I	0.029	0.234	0.038	0.090
Stage II	0.073	0.030	0.045	0.030
Stage III	0.388	0.244	0.163	0.150
Stage IV	0.599	0.313	0.136	0.035