The observational result of crack fracture form for rock samples with close crack under unloading after the peak compression shear load.

介绍了对含闭合裂缝岩石试件在达到峰值压剪荷载时卸荷的裂缝断裂形态观察结果。

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Second, BMEP represents an average pressure while compression ratio is a way to describe peak cylinder pressure.

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