岩石损伤统计本构模型参数及其临界敏感性分析

Parameters of Statistical Damage Constitutive Model for Rocks and Its Critical Sensibility Analysis

在岩石应变软化变形全过程的损伤统计本构模型基础上,根据单轴压缩应力应变全过程曲线,进一步明确了本构模型中分布参数的物理意义和实际意义,提出了模型参数的确定方法并通过试验验证了该方法的合理性,在此基础上进一步分析了不同均质度岩石的临界敏感性.结果表明,通过该方法确定的岩石均质度综合反映了岩石峰前聚能和峰后释能的能力,比以往的计算和拟合过程更简单,物理意义更加明确;随着均质度的增加,岩石临界行为特征越来越明显,临界敏感性增强,对于岩爆岩石来说,岩爆倾向性增强.通过确定的岩石均质度可以方便的定量比较不同岩石的临界敏感性和岩爆倾向性,便于更好的指导实际工程和提前采取预防措施.

Based on rock damage statistical constitutive model founded by the whole process of rock strain softening deformation,the physical and practical significance of model parameters are further defined according to the whole process of uniaxial compression stress-strain curves.The method to determine the model parameters is proposed and its rationality validated by tests.The critical sensibility of different homogeneous rocks is further analyzed.The results show that the homogeneity degree of rocks determined b...