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A model for describing and predicting the creep strain of rocks from the primary to the tertiary stage

Ruofan Wang, Li Li and Richard Simon

Article (2019)

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Cite this document: Wang, R., Li, L. & Simon, R. (2019). A model for describing and predicting the creep strain of rocks from the primary to the tertiary stage. International Journal of Rock Mechanics and Mining Sciences, 123, p. 104087. doi:10.1016/j.ijrmms.2019.104087
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Abstract

Rocks under applied stresses can exhibit more or less degree of creep. Over the years, a large number of creep models have been proposed for rocks. However, few models account for friction angle and time to failure. In most cases, curve fitting technique is applied to all of the available experimental results to obtain the required model parameters. The ability of the calibrated model (i.e. the model with the obtained model parameters) to predict the rheological behavior under untested stress conditions remains unknown. In this paper, a new model, called ubiquitous-corrosion-Coulomb (UCC) creep model, is proposed. Distinction is made between reversible and irreversible creep strains. Subcritical crack growth is related to the irreversible creep strain and delayed failure of rocks. The effect of friction angle and confining stresses on the rate of irreversible creep strain and time to failure has been considered. With the UCC model, the failure plane in creep tests making an angle of 45°−ϕ/2 with the major principal stress is explained by the fact that among the numerous micro cracks, the cracks along this orientation are the first ones becoming unstable. To test the capability of the UCC creep model against experimental results available in the literature, the required model parameters are first obtained by applying the curve-fitting technique on a part of the available experimental results. The predictability of the calibrated model is then tested against another part of the available experimental results, which are not used in the previous curve-fitting process. The results showed that the proposed UCC creep model can be used to describe and predict the creep strain and time to failure of rocks.

Uncontrolled Keywords

Rock mechanics; Rheological model; Creep; Time to failure; Description; Prediction

Open Access document in PolyPublie
Subjects: 1400 Génie minier et minéral > 1400 Génie minier et minéral
1400 Génie minier et minéral > 1403 Mécanique des roches
Department: Département des génies civil, géologique et des mines
Research Center: Autre
Funders: CRSNG/NSERC, FRQNT, China Scholarship Council
Grant number: 402318, RGPIN-2018-06902, 2015-MI-191676, 201706420059
Date Deposited: 11 Dec 2019 10:58
Last Modified: 12 Dec 2019 01:20
PolyPublie URL: https://publications.polymtl.ca/4085/
Document issued by the official publisher
Journal Title: International Journal of Rock Mechanics and Mining Sciences (vol. 123)
Publisher: Elsevier
Official URL: https://doi.org/10.1016/j.ijrmms.2019.104087

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