Moisture-induced softening characteristics and mechanisms of saturated hard rocks under compression

ZHU Jun; DENG Jianhui; CHEN Fei; HUANG Yiming

doi:10.11779/CJGE20220172

Volume 45 Issue 4

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Chinese Journal of Geotechnical Engineering > 2023 > 45(4): 768-776. > DOI: 10.11779/CJGE20220172

ZHU Jun, DENG Jianhui, CHEN Fei, HUANG Yiming. Moisture-induced softening characteristics and mechanisms of saturated hard rocks under compression[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(4): 768-776. DOI: 10.11779/CJGE20220172

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Moisture-induced softening characteristics and mechanisms of saturated hard rocks under compression

ZHU Jun^{1, 2,},
DENG Jianhui^2, ,,
CHEN Fei³,
HUANG Yiming²

1.
Key Laboratory of Mountain Hazards and Earth Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
2.
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China
3.
School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China

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Received Date: February 17, 2022
Available Online: April 16, 2023

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Abstract

Abstract

The water-rock interaction in rock mass engineering can lead to physical and mechanical deterioration of rock, that is, the moisture-induced softening phenomenon of rock. Currently, the studies on the moisture-induced softening properties of saturated hard rocks are not comprehensive, and it is still challenging to evaluate the triggering condition and extent of effects related to various water-rock interactions. By choosing the typical hard rocks with different mineral compositions and microstructures (i.e., Baoxin marble, Jinping marble, and limestone), the uniaxial compression tests, along with the acoustic emission (AE) monitoring, of three kinds of hard rocks under dry and saturated conditions are carried out. The mechanical properties of rock including uniaxial compressive strength (UCS), elastic modulus and failure patterns as well as the statistical characteristics of the dominant frequency of AE waveforms are analyzed. Further, the triggering condition and extent of the pore water pressure effects of these three kinds of rocks are evaluated. The results show that when the hard rocks are saturated, the UCS and elastic modulus both decrease, and the tensile cracks and tensile failure surfaces increase. The twin-peak feature of the dominant frequency of all AE waveforms is exhibited, which is independent of the hard rock types and soaking states. As the hard rocks are saturated, the number of AE waveforms in high dominant frequency bands reduces remarkably, while that in low dominant frequency bands increases significantly. The effect of pore water pressure, which corresponds to the low dominant frequency of AE waveforms, is the main factor responsible for the mechanical degradation of three kinds of saturated hard rocks, and its intensity depends on the mineral composition and pore structure of rock.
- rock mechanics,
- mechanical property,
- moisture-induced softening mechanism,
- acoustic emission,
- dominant frequency

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References

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