Mechanical and Coal Burst Breeding Mechanism of Coal Samples under True Triaxial Loading and Unloading

<div>Comparison of nonbursting sample and bursting sample before and after testing (previous row: pretest photos; next row: post-test photos; The red arrow: the direction of unloading): (a) nonbursting coal sample (sample C); (b) bursting coal sample (sample M).</div>

Advances in Civil Engineering

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Figure 4

Figure 4: Mechanical and Coal Burst Breeding Mechanism of Coal Samples under True Triaxial Loading and Unloading 