中文摘要：

通过开展花岗岩室内三轴卸荷流变试验,研究硬脆性岩石的卸荷流变力学特性、变形特征及破坏特征,分析岩石的破裂机制。结果表明,改进的Mohr-Coulomb强度准则能够较好地描述岩石卸荷流变破坏强度特性,改进的对数型卸荷蠕变方程能够有效地反映和预测硬脆性岩石的卸荷蠕变变形特征。研究成果旨在为硬脆性岩石的卸荷流变力学特性研究提供借鉴。

英文摘要：

The rheological test during unloading phase for different stress paths were performed in laboratory by using rock triaxial rheological servo apparatus to study the unloading rheological mechanical properties,deformation characteristics and failure characteristics of the hard brittle granite rock mass.Its failure mechanism was also analyzed.The results showed that the improved Mohr-Coulomb strength criterion of hard brittle rock was capable of reflecting the damage strength characteristics with small prediction error.Meanwhile,the improved creep empirical equations for brittle rock that have been established by regression fitting method can effectively reflect and predict the unloading creep deformation characteristics of hard brittle rock.The results provides important experimental and theoretical foundation for the unloading creep characteristics of brittle rock.