A Potential Strain Indicator for Brittle Failure Prediction of Low-porosity Rock: Part I—Experimental Studies Based on the Uniaxial Compression Test

Published on Sep 1, 2015in Rock Mechanics and Rock Engineering4.14
· DOI :10.1007/S00603-014-0675-9
Lei Xue9
Estimated H-index: 9
(CAS: Chinese Academy of Sciences),
Meng Qi2
Estimated H-index: 2
(NCWU: North China University of Water Conservancy and Electric Power)
+ 3 AuthorsMiaomiao Wang2
Estimated H-index: 2
(CAS: Chinese Academy of Sciences)
In this paper, we have investigated the quantitative relationship between the axial strain threshold at the volumetric strain reversal point (e 1cd) and the strain threshold at the peak stress (e 1ucs) during the uniaxial compression tests. We found that normalized values of e 1ucs/e 1cd for different rock types are typically ~1.34(±0.24). This is especially true for igneous and metamorphic rocks, or low-porosity sedimentary rocks. To verify this finding, we investigated seven granitic gneiss samples using the uniaxial compression test. Our results were consistent with the above statistics. We inferred that e 1ucs/e 1cd may be an intrinsic property of low-porosity rocks, and may be a potential indicator for predicting failure strains in laboratory-scale rock samples.
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The Rock Engineering Laboratories of Rock Engineering Department of Aalto University Helsinki Finland and School of Mining Engineering Wits University South Africa are appreciated for allowing part of this work to be done there.