在岩石试件卸荷试验的基础上，结合大型开挖工程，研究了岩体在卸荷状态下的变形破裂特征。

On the basis of unloading tests of rock sample, the deformation and fracture features of unloaded rock mass are studied in conjunction with fracture systems of some large excavation project.

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基于岩石试件的卸荷试验，研究卸荷条件下岩石的变形、参数及破裂特征。

Based on unloading tests of rock samples, the deformation, parameters and fracture features of rocks under unloading are studied.

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样品变形处于半脆性域，以出现非破裂的准韧性剪切带为特征。

Optical micrographs of deformed samples show that different scales of semi brittle ductile shear zones (SBDSZ) occur with different strains.

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