岩石时间硬化损伤蠕变特性

Damage creep characteristics of rock time-hardening

分析岩石蠕变过程中的非线性损伤特征,在各向同性的蠕变方程中引入时间硬化,采用应变等效原理,推导出时间硬化条件下的岩石蠕变方程,利用该方程可以同时描述岩石蠕变曲线的初始蠕变、等速蠕变和加速蠕变三个阶段,并进行了参变曲线数值求解和参数特性分析,利用该方程拟合了某页岩三轴蠕变实验数据,同时揭示了蠕变现象的非线性本质.结果表明:利用该方程可以较好地模拟岩石蠕变曲线的3个阶段.

To analyze the nonlinear damage characteristics in rock creep process,a time hardening parameter is introduced into the isotropic creep equation.Using strain equivalent principle,a rock creep equation is derived under the conditions of time hardening.The equation can describe the three stages in rock creep curve at the same time： initial creep,constant speed creep and accelerated creep.In addition,the study provides numerical solution for the parameter variable curve and analyzes the parameter characteristics.Using the equation fittings,the study ascertains the shale’s three axis creep experimental data,and reveals the non-linear nature of creep phenomenon.The study results show that using equations can better simulate the three creep curves stages of rock creep.