Partial collapse mechanism of a horseshoe-shaped tunnel face in layered soils
Layered soils are becoming increasingly common in tunnel construction. In order to investigate the stability of horseshoe-shaped tunnel face in layered soils, a rotational partial failure mechanism is presented, considering the conditions for the occurrence of partial failure. A series of numerical...
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| Published in | Computers and geotechnics Vol. 167; p. 106114 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
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Elsevier Ltd
01.03.2024
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| Abstract | Layered soils are becoming increasingly common in tunnel construction. In order to investigate the stability of horseshoe-shaped tunnel face in layered soils, a rotational partial failure mechanism is presented, considering the conditions for the occurrence of partial failure. A series of numerical simulation models provide essential data required to predict the shape of the mechanism. The upper-bound limit analysis method and the spatial discretization technique is adopted so that collapse pressure and the estimated collapse zone can be got. Subsequently, the obtained results from the proposed mechanism with those derived from numerical models and existing approaches is contrasted, verifying the accuracy the superiority of the mechanism in analyzing the stability of horseshoe-shaped tunnel face. Finally, size effect is analyzed to provide reference for large-diameter shield engineering. |
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| AbstractList | Layered soils are becoming increasingly common in tunnel construction. In order to investigate the stability of horseshoe-shaped tunnel face in layered soils, a rotational partial failure mechanism is presented, considering the conditions for the occurrence of partial failure. A series of numerical simulation models provide essential data required to predict the shape of the mechanism. The upper-bound limit analysis method and the spatial discretization technique is adopted so that collapse pressure and the estimated collapse zone can be got. Subsequently, the obtained results from the proposed mechanism with those derived from numerical models and existing approaches is contrasted, verifying the accuracy the superiority of the mechanism in analyzing the stability of horseshoe-shaped tunnel face. Finally, size effect is analyzed to provide reference for large-diameter shield engineering. |
| ArticleNumber | 106114 |
| Author | Wang, Saixu Li, Wei Jin, Zixian Wang, Libin Zhang, Chengping Tu, Shiqin |
| Author_xml | – sequence: 1 givenname: Saixu surname: Wang fullname: Wang, Saixu organization: Key Laboratory of Urban Underground Engineering of the Education Ministry, Beijing Jiaotong University, Beijing 100044, China – sequence: 2 givenname: Chengping surname: Zhang fullname: Zhang, Chengping organization: Key Laboratory of Urban Underground Engineering of the Education Ministry, Beijing Jiaotong University, Beijing 100044, China – sequence: 3 givenname: Wei surname: Li fullname: Li, Wei email: weili1@bjtu.edu.cn organization: Key Laboratory of Urban Underground Engineering of the Education Ministry, Beijing Jiaotong University, Beijing 100044, China – sequence: 4 givenname: Shiqin surname: Tu fullname: Tu, Shiqin organization: Key Laboratory of Urban Underground Engineering of the Education Ministry, Beijing Jiaotong University, Beijing 100044, China – sequence: 5 givenname: Libin surname: Wang fullname: Wang, Libin organization: Key Laboratory of Urban Underground Engineering of the Education Ministry, Beijing Jiaotong University, Beijing 100044, China – sequence: 6 givenname: Zixian surname: Jin fullname: Jin, Zixian organization: Key Laboratory of Urban Underground Engineering of the Education Ministry, Beijing Jiaotong University, Beijing 100044, China |
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| Keywords | Partial collapse Tunnel face stability Limit analysis Layered soils 3D failure mechanism |
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| SubjectTerms | 3D failure mechanism Layered soils Limit analysis Partial collapse Tunnel face stability |
| Title | Partial collapse mechanism of a horseshoe-shaped tunnel face in layered soils |
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