Abstract
Determining rock damage thresholds is of great significance in predicting rock fracture. In this study, the relation among crack damage stress threshold (σcd), peak strength (σucs) and shape parameter m was observed. The impact imposed by temperature and confining pressure on m was then examined. The results show that there is an approximate linear relationship between σcd and σucs. Therefore, the normalized quantity σcd/σucs is considered one quantitative indicator useful in evaluating rock damage. The research performed uniaxial compression tests on gabbro specimens heated using microwaves. It is found that σucs and σcd decrease gradually with increases in irradiation energy for gabbro samples; with identical irradiation energy, higher heating power leads to faster decrease of m. We also collected data from previous studies on igneous rock damage. It is found that, with increases in m, σcd/σucs increases, but overall, the ratio is not sensitive to m and m is primarily distributed between 1 and 4; further, m decreases with increases in temperature—at 600 °C and 800 °C, m decreases significantly, which has close connections with quartz phase transition. Subject to low confining pressure, m grows as confining pressure grows. If the confining pressure rises beyond 40 MPa, the plastic characteristics of the rock are enhanced which causes m to decrease.
Article Highlights
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For gabbro samples heated by microwaves, as irradiation energy increases, both σucs and σcd progressively reduce. Subject to the identical irradiation energy, higher heating power results in faster decrease in the value of m.
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The value of σcd/σucs increases with shape parameter m, but overall, the ratio is not sensitive to m and m is primarily distributed between 1 and 4.
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For different types of igneous rock samples, m decreases with increases in temperature. In particular, at 600 °C and 800 °C, the m decreases significantly.
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Under low confining pressure, m increases as confining pressure increases. As long as the confining pressure surmounts 40 MPa, the plastic characteristics of the rock are enhanced and the m begins to decrease.
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This research was supported by the National Natural Science Foundation of China (Grant Nos. 41972288, 41977249, 42090052).
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Ge, Z., Sun, Q., Xue, L. et al. The influence of temperature and confining pressure on the cracks damage threshold and shape parameter m of igneous rock. Geomech. Geophys. Geo-energ. Geo-resour. 7, 58 (2021). https://doi.org/10.1007/s40948-021-00254-5
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DOI: https://doi.org/10.1007/s40948-021-00254-5