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

Lei Xue  
【摘要】: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(σ_(cd))and the uniaxial compressive strength{σ_(ucs))was constructed.The results indicate that the normalized quantityσ_(cd)/σ_(ucs)decreases as the shape parameter m increases,and that it gradually tends towards a constant horizontal asymptote that is~0.82.In addition,the experimental results ofσ_(cd)/σ_(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 ofσ_(cd)/σ_(ucs)for lowporosity rock samples is~0.80(±0.10),which would appear to be approximately consistent with the theoretical solution.This preliminary study indicates that the normalized quantityσ_(cd)/σ_(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.

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