基于初始损伤系数修正的岩石损伤统计本构模型

损伤力学是解决岩石类材料变形和破裂的重要手段之一,统计损伤理论是目前岩石损伤研究的热点。针对以往岩石损伤统计本构模型的不足,引入初始损伤系数q,从一定意义上反映了岩石的非均匀性、非线性特征,同时,通过引入岩石应力应变全过程曲线特征参量,并考虑岩石应力应变全过程曲线的几何条件,解决了传统方法求解本构方程中参数的难点,提高了精度。基于取自某工程的砂岩所进行的三轴压缩试验实测结果,对所建立的岩石损伤统计本构模型进行了实验验证,并估算了q值。

he Revises Damage Statistical Constitutive Model for Rock Based on Uniform Coefficient

Damage is an important mean for the analysis of the deformation and fracture of rock,and statistical damage theory have received much attention in the study of rock damage.Initial damage coefficient,reflecting the inhomogeneous and non-linear of the rock to a certain degree,was proposed by analyzing the shortage of the statistical constitutive model of rock damage.By considering characteristic parameter and geometric condition of rock complete stress-strain curve,the difficulties of calculating the parameter of constitutive equation in the traditional method was overcomed,and the calculational precision was improved.At last,based on the triaxial compressive test results of sand rock from a practical engineering,the statistical constitutive model of rock damage was confirmed,and the size-up of q was discussed.