A potential stress indicator for failure prediction of laboratory-scale rock samples

作者：Xue, Lei^*

来源：Arabian Journal of Geosciences, 2015, 8(6): 3441-3449.

DOI：10.1007/s12517-014-1456-1

• Failure prediction
• Uniaxial compression test
• Crack damage stress threshold
• Renormalization group theory

Based on the two-dimensional renormalization group model, which can consider the stress transfer mechanism, in the present paper, the theoretical quantitative correlation between the threshold of the crack damage stress (sigma(cd)) and the uniaxial compressive strength (sigma(ucs)) was constructed. The results indicate that the normalized quantity sigma(cd)/sigma(ucs) decreases as the shape parameter m increases, and that it gradually tends towards a constant horizontal asymptote that is similar to 0.82. In addition, the experimental results of sigma(cd)/sigma(ucs) obtained in previous studies using different rock types were analyzed. From this analysis, it was found that the overall average and the standard deviation of sigma(cd)/sigma(ucs) for low-porosity rock samples is similar to 0.80 (+/- 0.10), which would appear to be approximately consistent with the theoretical solution. This preliminary study indicates that the normalized quantity sigma(cd)/sigma(ucs) might be an intrinsic property of low-porosity rocks and thus could be regarded as a potential indicator for the failure prediction of laboratory-scale rock samples.

• 出版日期2015-6
• 单位中国科学院地质与地球物理研究所兰州油气资源研究中心; 中国科学院地质与地球物理研究所