Abstract
Determining the localized deformation mechanism is of vital importance to understand the failure processes of geomaterials in practical engineering. In this study, uniaxial monotonic and cyclic loading tests of slate samples were conducted and the failure processes were recorded by using the AE system and digital image correlation (DIC). The results show that the deformation field variance increases significantly in the initiation of the macro-scale failure stage. Under cyclic loading, the shape of the stress-variance hysteresis curve varies with increasing upper limit stress, and four types of stress-variance hysteresis curves were revealed. Increasing lag time of variance indicates gradual accumulation of damage to the sample. The comprehensive analysis of the evolution process of damage variables defined by cumulative AE counts and variance reveals that the rock failure process can be divided into crack closure stage, initial damage stage, stable development stage, accelerated development stage and failure stage. By proposing the differentiation rate, it is found that there are apparent failure precursor points under monotonic and cyclic loading.
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Acknowledgements
This study was financially sponsored by the National Natural Science Foundation of China (Grant No. 41931296), the National Key R&D Program of China (No. 2017YFC1501002) and the National Nature Science Foundation of China (Grant Nos. 41907254 and 41521002).
Funding
This research was funded by Key Programme, Grant no [41931296], National Key R& D Program of China, Grant no [2017YFC1501002], Young Scientists Fund, Grant no [41907254], National Natural Science Foundation of China, Grant no [41521002].
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Pei, X., Cui, S., Zhu, L. et al. Quantitative investigation on localized deformation process of rocks by uniaxial test and digital image correlation. Environ Earth Sci 82, 267 (2023). https://doi.org/10.1007/s12665-023-10939-7
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DOI: https://doi.org/10.1007/s12665-023-10939-7