Time-sensitivity mechanism of rock stress memory properties under tensile stress
In deep underground engineering, understanding of time-related stress memory properties is critical to evaluate the in situ stress conditions of a rock mass. In this study, the time-sensitivity mechanism of the rock stress memory properties under tensile stress was investigated. It was found that th...
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doaj-d8d517acb0524710ab65f6e4f9fbadb32020-11-25T03:10:49ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552020-06-01123528540Time-sensitivity mechanism of rock stress memory properties under tensile stressYuxin Ban0Xiang Fu1Qiang Xie2Jun Duan3School of Civil Engineering, Chongqing University, Chongqing, 400044, China; Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing, 400044, ChinaSchool of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China; Changjiang River Scientific Research Institute of Changjiang Water Resources Commission, Wuhan, 430010, China; Corresponding author.School of Civil Engineering, Chongqing University, Chongqing, 400044, China; Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing, 400044, China; Corresponding author.School of Civil Engineering, Chongqing University, Chongqing, 400044, China; Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing, 400044, ChinaIn deep underground engineering, understanding of time-related stress memory properties is critical to evaluate the in situ stress conditions of a rock mass. In this study, the time-sensitivity mechanism of the rock stress memory properties under tensile stress was investigated. It was found that the material property (Poisson's ratio) and crack angle were the controlling factors of the Kaiser effect (KE) under tensile stress. In particular, the time-sensitivity of the stress memory properties was closely related to the crack growth path. When the failure of the rock specimen was dominated by tensile microcracks and the crack development direction was deflected by up to 30° in the successive loading process, the stress memory capacity was likely to be time-independent for a sandstone specimen. The distribution of the Felicity ratio in a Brazilian test was more discrete than that in a three-point bending test. It also showed that the changes in the crack path, rather than the time interval between successive loading cycles, led to inaccuracy of the detected KE. This study provides insights into stress memory-related issues under uniaxial or more complex stress conditions and thus facilitates development of methods for testing in situ mechanical behaviors of rocks with acoustic emission (AE) technology.http://www.sciencedirect.com/science/article/pii/S1674775520300470Acoustic emission (AE)Time-sensitivityStress memoryKaiser effect (KE)Brazilian disc rotationPower spectrum |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yuxin Ban Xiang Fu Qiang Xie Jun Duan |
spellingShingle |
Yuxin Ban Xiang Fu Qiang Xie Jun Duan Time-sensitivity mechanism of rock stress memory properties under tensile stress Journal of Rock Mechanics and Geotechnical Engineering Acoustic emission (AE) Time-sensitivity Stress memory Kaiser effect (KE) Brazilian disc rotation Power spectrum |
author_facet |
Yuxin Ban Xiang Fu Qiang Xie Jun Duan |
author_sort |
Yuxin Ban |
title |
Time-sensitivity mechanism of rock stress memory properties under tensile stress |
title_short |
Time-sensitivity mechanism of rock stress memory properties under tensile stress |
title_full |
Time-sensitivity mechanism of rock stress memory properties under tensile stress |
title_fullStr |
Time-sensitivity mechanism of rock stress memory properties under tensile stress |
title_full_unstemmed |
Time-sensitivity mechanism of rock stress memory properties under tensile stress |
title_sort |
time-sensitivity mechanism of rock stress memory properties under tensile stress |
publisher |
Elsevier |
series |
Journal of Rock Mechanics and Geotechnical Engineering |
issn |
1674-7755 |
publishDate |
2020-06-01 |
description |
In deep underground engineering, understanding of time-related stress memory properties is critical to evaluate the in situ stress conditions of a rock mass. In this study, the time-sensitivity mechanism of the rock stress memory properties under tensile stress was investigated. It was found that the material property (Poisson's ratio) and crack angle were the controlling factors of the Kaiser effect (KE) under tensile stress. In particular, the time-sensitivity of the stress memory properties was closely related to the crack growth path. When the failure of the rock specimen was dominated by tensile microcracks and the crack development direction was deflected by up to 30° in the successive loading process, the stress memory capacity was likely to be time-independent for a sandstone specimen. The distribution of the Felicity ratio in a Brazilian test was more discrete than that in a three-point bending test. It also showed that the changes in the crack path, rather than the time interval between successive loading cycles, led to inaccuracy of the detected KE. This study provides insights into stress memory-related issues under uniaxial or more complex stress conditions and thus facilitates development of methods for testing in situ mechanical behaviors of rocks with acoustic emission (AE) technology. |
topic |
Acoustic emission (AE) Time-sensitivity Stress memory Kaiser effect (KE) Brazilian disc rotation Power spectrum |
url |
http://www.sciencedirect.com/science/article/pii/S1674775520300470 |
work_keys_str_mv |
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