کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
809287 | 1468709 | 2013 | 10 صفحه PDF | دانلود رایگان |

The question which type of signals can be determinately related to catastrophic rupture in heterogeneous brittle media still remains open. Here we report a specific precursor of catastrophic rupture, i.e. a power-law singularity of responses, based on rock experiments. Our experimental observations show that the singularity with power exponent −β, where β=0.51±0.10 (mean±s.d.), appears ahead of catastrophic rupture in some rocks, and the singularity does not appear at all for gradual failure. It is indicated that the power-law singularity can emerge well only close to catastrophic rupture and thus it could serve as a specific warning for catastrophic rupture. To address the potential forewarning of imminent catastrophic rupture, a fitting process based on the data before catastrophic rupture was developed to determine the two unknowns related to the occurrence, catastrophe point UF and the power exponent −βu. It is demonstrated that the power-law singularity appears only in the vicinity of catastrophe, and that the power-law singularity does not occur for gradual failure.
► Power-law singularity as a possible catastrophe warning observed in rock experiments.
► The singularity of responses with power exponent −β, where β=0.51±0.10 (mean±s.d.).
► The power-law singularity appears only in the vicinity of catastrophe.
► The power-law singularity does not appear at all for gradual failure.
► A short-term forewarning of catastrophe might be possible.
Journal: International Journal of Rock Mechanics and Mining Sciences - Volume 60, June 2013, Pages 253–262