岩石蠕变产生的内部结构变化和损伤导致其过程呈现非线性特性 ,为此 ,采用不可逆热力学方法 ,在Biot粘弹性发展方程的基础上引入能反映材料内部结构变化和损伤的结构参数按其对Helmholtz自由能和发展方程的影响 ,推导出岩石非线性蠕变一般发展方程 ,并研究了单轴蠕变时岩石的非线性蠕变行为 .分析结果表明 :岩石蠕变时存在某一极限应力值 ,当轴向应力低于此值时 ,蠕变将以递减的速率趋近于某一常数 ;当轴向应力高于此值时 ,蠕变开始以递减的速率增加 ,随后 ,当蠕变量达到一定数值时 ,蠕变率以递增的速率进入加速段 ,从而解释了岩石蠕变中的现象 . Because of the change and damage of the internal structure caused by the rock creep, the nonlinear characteristic of the process is presented. Based on the Biot viscoelasticity evolution equation, the irreversible thermodynamics method is adopted to introduce the structural parameters that reflect the change and damage of the internal structure of the material. Helmholtz free energy and the evolution equation, the general equation of nonlinear creep of rock is deduced and the nonlinear creep behavior of rock under uniaxial creep is studied. The results show that there exists some ultimate stress value When the axial stress is lower than this value, the creep will approach a certain constant at a decreasing rate. When the axial stress is higher than this value, the creep begins to increase at a decreasing rate. Then, when the creep amount When a certain value is reached, the creep rate enters the accelerating section at an increasing rate, thus explaining the phenomenon of rock creep.