Experimental Study on Triaxial Unloading Failure of Deep Composite Coal-Rock

<div>Stress path and compressive strength at different unloading rates. (a) Stress paths of 1# ∼ 3# samples. (b) Triaxial compressive strength fitting curve.</div>

Advances in Civil Engineering

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Figure 3

Figure 3: Experimental Study on Triaxial Unloading Failure of Deep Composite Coal-Rock 