The Damage Constitutive Model of Sandstone under Water-Rock Coupling

Figure 2

SEM test results of mudstone and sandstone under different water-rock coupling degrees (Tang et al. [24]).

(a) The 1 cycle

(b) The 3 cycles

(c) The 8 cycles

(d) The 1 cycle

(e) The 3 cycles

(f) The 8 cycles