Experimental Study on Creep Behavior and Crack Evolution of Stratified Structural Sandstone under Segmental Constant Load

Figure 8

Constant load test curve of rock samples from the USO group.

(a) USO-1 sample

(b) USO-2 sample

(c) USO-3 sample

(d) USO-4 sample

(e) USO-5 sample

(f) USO-6 sample

(g) USO-7 sample

(h) USO-8 sample