Journal ArticleDOI
How do thermally induced microcracks alter microcracking mechanisms in Hong Kong granite
TLDR
In this paper, the authors analyzed the effects of pre-existing thermal microcracks on the microcracking mechanisms of Hong Kong granite under mode I loading, and found that the presence of the thermal micro-cracks aggravates the micro crack damage.About:
This article is published in Engineering Geology.The article was published on 2021-10-01. It has received 13 citations till now.read more
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Journal ArticleDOI
Cracking mechanisms of a medium-grained granite under mixed-mode I-II loading illuminated by acoustic emission
TL;DR: In this article, the authors investigate the effect of the loading condition and granite heterogeneity on the cracking mechanism and find that the microcracks under mixed-mode I-II loading do not nucleate as easily as compared with that in mode I case.
Journal ArticleDOI
Extracting acoustic emission features that precede hard rock instability with unsupervised learning
TL;DR: In this article , acoustic emission (AE) signals were acquired, and their clustering features were automatically extracted by the clustering unsupervised learning method, which showed that a class of AE signals featured high rise time, high ring count, high energy and low peak frequency and low quantity can be used as an indicative precursor feature of hard rock instability.
Journal ArticleDOI
Investigation of the fracture characteristics of granite and green sandstone under different thermal treatments
Zheming Zhu,Huachao Gao +1 more
TL;DR: In this paper , a cracked straight-through Brazilian disc (CSTBD) specimen was applied to investigate the fracture behavior of two types of rock materials (hard rock and soft rock) under high temperature, which was made of granite and green sandstone and heating temperature from 25 °C (room temperature) to 700 °C.
Journal ArticleDOI
Mechanical response to dynamic compressive load applied to shale after thermal treatment
Linqi Huang,Yide Guo,Xibing Li +2 more
TL;DR: In this article , the authors employed the Split Hopkinson pressure bar to measure the dynamic compressive mechanical response of shale specimens with five different bedding dips after thermal treatment of 25-200 °C under the same impact energy.
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Microcracking mechanisms of cyclic freeze–thaw treated red sandstone: Insights from acoustic emission and thin-section analysis
TL;DR: In this article , the effects of cyclic freeze-thaw (F-T) on the microcracking behavior of sandstone under mode I loading were investigated and the results showed that the damage degree does not significantly increase until the F-T cycle number exceeds a threshold between 60 and 90.
References
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Journal ArticleDOI
Shear Rate Effects on the Post-peak Shear Behaviour and Acoustic Emission Characteristics of Artificially Split Granite Joints
TL;DR: In this paper, direct shear tests at various shear rates (0.001-0.1mm/s) under different normal stresses (3-40 MPa) are conducted on split granite joints, and the influences of shear rate on the shear strength, post-peak shear behaviour and acoustic emission (AE) characteristics are analyzed and discussed.
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Comparison of polarity and moment tensor inversion methods for source analysis of acoustic emission data
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Effects of cyclic heating and LN2-cooling on the physical and mechanical properties of granite
TL;DR: In this article, the effect of cyclic heating and liquid nitrogen cooling on physical and mechanical properties of granites was investigated for HDR geothermal geothermal applications, and the results indicated that the higher heating temperature in the cycles contributes to improving the decay rate and intensifying damage of granite.
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Effect of heat-treatment on the dynamic compressive strength of Longyou sandstone
TL;DR: In this paper, X-ray Micro-computed tomography (CT), a non-destructive observation technique was utilized to quantify the damage induced by the heat-treatment and establish its correlation to the mechanical properties of rocks.
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Seismic moment tensor and b value variations over successive seismic cycles in laboratory stick‐slip experiments
TL;DR: In this paper, the authors investigated stick-slip events on Westerly granite samples containing the following: (1) a planar saw cut fault and (2) a fault developed from a fresh fracture surface.