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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。结果表明，原有闭合裂缝已张开；裂缝尖端区域岩石晶粒已破碎，并可见碎粒剪切错动与偏转；次生裂缝组的走向与微裂区的形状呈不对称的桑叶状，与张开裂缝（切口）尖端岩石断裂形态相似；岩石压剪主剪断面沿该破裂区上部边界扩展。
The fracture fracture morphology of unloaded rock specimens with closed cracks at the peak compressive shear load was introduced. The results show that the original closed cracks have opened; the rock grains at the crack tip region have been broken, and the shear displacement and deflection of the crumbs can be seen; the shape of the secondary fracture group and the shape of the microcrack zone are asymmetrical mulberry leaves. The fracture morphology of the tip rock is similar to that of open fractures (incisions); the shear shear section of rock shears and shears extends along the upper boundary of the rupture zone.