三轴压缩条件下岩石损伤统计本构模型研究

A Study of Statistical Constitutive Model of Rock Damage under Triaxial Compression

为揭示岩石三轴压缩过程中应力-应变特性,从岩石微元强度服从Weibull分布出发,采用损伤理学理论,建立了能够反映岩石三轴压缩条件下的损伤劣化本构方程。选取灰岩试样展开三轴压缩试验,将试验曲线与模型理论曲线进行对比,两者吻合度较好。表明已建立的损伤统计本构模型能够较好的反映岩石三轴压缩过程的应力-应变特性。

In order to reveal the stress-strain characteristics of rock under triaxial compression, the constitutive equation of rock damage degradation under triaxial compression is established using damage theory based on Weibull distribution of rock micro-element strength. The triaxial compression test of limestone specimen is carried out and the experimental curves are compared with the theoretical curves of the model, and the two curves are in good agreement with each other. It is shown that the established statistical damage constitutive model can well reflect the stress-strain characteristics of rock during triaxial compression.