An Experimental Study on the Water-Induced Strength Reduction in Zigong Argillaceous Siltstone with Different Degree of Weathering

Figure 9

Microstructural characteristics of the Zigong argillaceous siltstone with different degree of weathering (SEM images): (a) natural highly weathered; (b) saturated highly weathered; (c) natural moderately weathered; and (d) saturated moderately weathered.

(a)

(b)

(c)

(d)