中文摘要：

蠕变是岩石的重要力学特征之一。根据岩石全过程应力一应变曲线的特征，建立非线性黏弹塑性蠕变模型，并建立了模型的状态方程、本构方程、恒应力状态下的蠕变方程和恒速率应力状态下的蠕变方程。通过引入岩石的流变指数建立的非线性黏弹塑性蠕变模型，较好地反映了岩石试件的3阶段蠕变过程，充分描述岩石加速蠕变特性；同时，得出岩石试件蠕变变形、蠕变速率和蠕变加速度的解析表达式。通过分析，岩石试件在恒应力速率下，只要应力大于岩石的长期强度，岩石试件就进入加速蠕变阶段；而在恒应力下，岩石试件在经过一定时间后才能进入加速蠕变阶段。这一时间的长短与岩石试件的力学性质有关．

英文摘要：

Creep is one of important rock mechanics characteristics. Based on rock stress-strain curve along complete path, a non-linear viscous elastic-plastic and creep model was set up. State equation, physical equation and creep regularity in constant stress and permanent rate stress were obtained. With rock rheologic exponential, this creep model could better behave 3-stage creep proceeding, especially accelerating creep stage. Analytic expressions of creep deformation, creep speed and creep acceleration of rock sample were given. Analysis results were shown as follow. In permanent rate stress, once stress of rock sample was greater than long-term strength of rock, rock sample would reach acceleration creep stage. However, in constant stress, rock sample could reach acceleration creep stage only after certain time. This time was much related to rock mechanics characteristic.