煤岩体裂隙集度演化理论模型

Crack density evolution model of rock and coal

为了描述煤岩体内裂隙演化对其宏观力学特性的影响,引入了裂隙集度参量,从热力学平衡方程出发,推导出裂隙集度演化方程;根据岩石试件单轴压缩的全程应力应变实验结果,给出了单轴压缩下的裂隙集度演化方程和考虑裂隙集度对煤岩体力学性质影响的非线性弹性裂隙演化本构方程;通过单轴压缩煤岩试样实验数据值与理论值对比,两者吻合度相当高,证明了理论分析及其理论模型的正确性。

In order to describe the influence of the crack density evolution to mechanic characteristics of rock and coal,the crack density is introduced in the paper.By using of the thermodynamic balance law,the theoretical model the crack density evolution is build,and the equation of crack density evolution is derived.Based on the experimental results of the complete stress-strain of rock specimen under the uniaxial compression,the evolution equation of crack density and the nonlinear elastic constitutive equation which considered the influence of crack density evolution are given.Compared the stress-stain experimental results of coal and rock under the uniaxial compression and the curve of the theoretical constitutive model of rock which considered the influence of crack density evolution,in can be find that the experimental curve and theoretical curve are coincided very well,that improved the correctness of the theoretical analysis and theoretical model.