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

<div>Stress path and compressive strength under different confining pressures. (a) Stress path of 4# ∼ 6#. (b) Triaxial compressive strength fitting curve.</div>

Advances in Civil Engineering

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Figure 4

Figure 4: Experimental Study on Triaxial Unloading Failure of Deep Composite Coal-Rock 