基于Mohr-Coulomb准则的岩石损伤统计分析方法研究

Study on the Statistical Analysis of Rock Damage Based on Mohr-Coulomb Criterion

从探讨基于Mohr-Coulomb准则的新的岩石微元强度表示方法及其服从Weibull随机分布的特点出发,基于岩石三轴应力应变试验曲线,建立了反映岩石破裂全过程的损伤软化统计本构模型.在此基础上,重点研究了Weibull分布参数对岩石损伤软化统计本构模型的影响,并结合岩石三轴应力应变试验曲线的特征,对岩石损伤软化统计本构模型进行了合理修正.与试验结果及前人研究结果比较,该模型形式简单,能更好地反映工程实际,具有广阔的应用前景.

By discussing the form of new rock micro-unit strength based on Mohr-Coulomb criterion, which satisfies Weibull random distribution, a statistical damage softening constitutive model reflecting the full process of rock failure was developed based on the stress-strain curve of tri-axial tests for rocks. Moreover, the effect of the parameters of Weibull distribution on the model was studied and the model was rectified according to the properties of tri-axial stress-strain test curve of rock. Compared with the existing research results, this model was simple and could better reflect the actual situation of engineering projects. Therefore, this model has broad prospects for application.