A Damage Constitutive Model of Red Sandstone under Coupling of Wet-Dry Cycles and Impact Load

Figure 3

Surface features of specimens under different wet-dry cycles: (a) n = 0; (b) n = 5; (c) n = 10; (d) n = 15; (e) n = 20.

(a)

(b)

(c)

(d)

(e)