Strength and Microscopic Damage Mechanism of Yellow Sandstone with Holes under Freezing and Thawing

Figure 7

Microporosity change diagram of A zone in yellow sandstone under freeze-thaw cycles. (a) Freeze-thaw 0 times. (b) Freeze-thaw 5 times. (c) Freeze-thaw 10 times. (d) Freeze-thaw 20 times. (e) Freeze-thaw 40 times.

(a)

(b)

(c)

(d)

(e)