Numerical Modeling of Stress Disturbance Characteristics during Tunnel Excavation
The stress state and principal stress axis changes of the stress-field tensor are analyzed during the advancement of a tunnel face on the basis of a given case study of the Jinping II Hydropower Station in China. First, the prevailing pole diagram in geology is used to illustrate the rotation of the...
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Online Access: | http://dx.doi.org/10.1155/2020/4508905 |
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doaj-ee2f4c948b9c4de193586c3fe1ae9fce2020-11-25T02:51:33ZengHindawi LimitedAdvances in Materials Science and Engineering1687-84341687-84422020-01-01202010.1155/2020/45089054508905Numerical Modeling of Stress Disturbance Characteristics during Tunnel ExcavationZeqi Zhu0Qian Sheng1Yumin Zhang2Shiwei Liu3State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, ChinaSchool of Resources and Environment, North China University of Water Resources and Electric Power, Zhengzhou 450046, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, ChinaThe stress state and principal stress axis changes of the stress-field tensor are analyzed during the advancement of a tunnel face on the basis of a given case study of the Jinping II Hydropower Station in China. First, the prevailing pole diagram in geology is used to illustrate the rotation of the stress axes as the tunnel face advances. The results show that the orientation adjustments of principal stresses in different positions near the tunnel boundary share common characteristics. The major and minor principal stress axes ahead of the tunnel face will rotate to intersect with the excavation surface at an angle, with the intermediate principal stress axis being almost parallel to the excavation surface. Furthermore, the stress triaxiality that is commonly used to indicate the deformation and damage of metal materials is introduced to describe the stress state change of the excavation-induced stress. The stress triaxiality is found to represent the stress state change due to the variation in both the magnitude and orientation of the stress-field tensor. According to the physical meaning and the change law of the stress triaxiality, stress disturbance during tunnel excavation can be divided into four stages, and the stress disturbance zone is divided into a strong disturbance zone and a weak disturbance zone. The disturbance characteristics of different stages and the distribution patterns of various zones are analyzed, which may be useful for practical application in the design and construction of rock tunnels.http://dx.doi.org/10.1155/2020/4508905 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Zeqi Zhu Qian Sheng Yumin Zhang Shiwei Liu |
spellingShingle |
Zeqi Zhu Qian Sheng Yumin Zhang Shiwei Liu Numerical Modeling of Stress Disturbance Characteristics during Tunnel Excavation Advances in Materials Science and Engineering |
author_facet |
Zeqi Zhu Qian Sheng Yumin Zhang Shiwei Liu |
author_sort |
Zeqi Zhu |
title |
Numerical Modeling of Stress Disturbance Characteristics during Tunnel Excavation |
title_short |
Numerical Modeling of Stress Disturbance Characteristics during Tunnel Excavation |
title_full |
Numerical Modeling of Stress Disturbance Characteristics during Tunnel Excavation |
title_fullStr |
Numerical Modeling of Stress Disturbance Characteristics during Tunnel Excavation |
title_full_unstemmed |
Numerical Modeling of Stress Disturbance Characteristics during Tunnel Excavation |
title_sort |
numerical modeling of stress disturbance characteristics during tunnel excavation |
publisher |
Hindawi Limited |
series |
Advances in Materials Science and Engineering |
issn |
1687-8434 1687-8442 |
publishDate |
2020-01-01 |
description |
The stress state and principal stress axis changes of the stress-field tensor are analyzed during the advancement of a tunnel face on the basis of a given case study of the Jinping II Hydropower Station in China. First, the prevailing pole diagram in geology is used to illustrate the rotation of the stress axes as the tunnel face advances. The results show that the orientation adjustments of principal stresses in different positions near the tunnel boundary share common characteristics. The major and minor principal stress axes ahead of the tunnel face will rotate to intersect with the excavation surface at an angle, with the intermediate principal stress axis being almost parallel to the excavation surface. Furthermore, the stress triaxiality that is commonly used to indicate the deformation and damage of metal materials is introduced to describe the stress state change of the excavation-induced stress. The stress triaxiality is found to represent the stress state change due to the variation in both the magnitude and orientation of the stress-field tensor. According to the physical meaning and the change law of the stress triaxiality, stress disturbance during tunnel excavation can be divided into four stages, and the stress disturbance zone is divided into a strong disturbance zone and a weak disturbance zone. The disturbance characteristics of different stages and the distribution patterns of various zones are analyzed, which may be useful for practical application in the design and construction of rock tunnels. |
url |
http://dx.doi.org/10.1155/2020/4508905 |
work_keys_str_mv |
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