Microscopic Characteristics of Fractured Sandstone after Cyclic Freezing-Thawing and Triaxial Unloading Tests

Figure 7

The morphologies of the fracture section. (a) Honeycomb-like microstructure, (b) striped microstructure, (c) step-like microstructure, (d) flocculent microstructure, and (e) smooth-joint microstructure.

(a)

(b)

(c)

(d)

(e)