Mechanical Properties of Grouted Crushed Coal with Different Grain Size Mixtures under Triaxial Compression

Figure 12

Three microscopic diffusion modes for the grouts flowing in most of the grouted crushed coal specimens obtained from the SEM images (magnified in the scale of 1 : 500) of failure surfaces. (a) Small specimen: grouts penetrating into the voids around the coal gravels (filling). (b) Large specimen: splitting the coal gravels first and then penetrating into them. (c) Small or large specimen: covering the coal gravels.

(a)

(b)

(c)