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Investigation of the Deformation Characteristics and Bearing Capacity of a Segment Structure of a Shield Tunnel with Cracks
https://orcid.org/https://orcid.org/0000-0001-9596-0140
https://orcid.org/https://orcid.org/0000-0002-8275-1937
https://orcid.org/https://orcid.org/0000-0001-5397-1212
https://orcid.org/https://orcid.org/0000-0003-3005-9735
https://orcid.org/https://orcid.org/0000-0002-0758-8383
https://orcid.org/https://orcid.org/0000-0001-9016-0435
In this paper, the displacement data of a segment lining structure in a similar model test were analyzed in depth based on a field investigation and the analysis of a cracked segment in a metro project. In doing so, we proved the displacement characteristics and bearing capacity of shield tunnel segments with different cracks numbers, lengths, and locations. The results showed that the presence of a crack decreases the overall stiffness of the structure relative to an undamaged segment ring and causes the deformation increases with the same load to increase. One-third of the width of a segment is the demarcation point at which the length of the crack begins to affect the mechanical properties of structure of the lining of the segment. When the length of the crack is larger than one-third the width of the segment, the instability of the structure tends to result in sudden failure. Although an increase in the number of cracks does not reduces the ultimate bearing capacity of the structure further, the deformation of the structure of the lining of the segment increases significantly as the number of cracks increases. compared to a crack at the vault and at the arch waist, the ultimate bearing capacity of the segment is the same when the crack is at the bottom of the arch, but the effects of cracks located at the arch bottom in the structural deformation are the most significant.
Investigation of the Deformation Characteristics and Bearing Capacity of a Segment Structure of a Shield Tunnel with Cracks
https://orcid.org/https://orcid.org/0000-0001-9596-0140
https://orcid.org/https://orcid.org/0000-0002-8275-1937
https://orcid.org/https://orcid.org/0000-0001-5397-1212
https://orcid.org/https://orcid.org/0000-0003-3005-9735
https://orcid.org/https://orcid.org/0000-0002-0758-8383
https://orcid.org/https://orcid.org/0000-0001-9016-0435
In this paper, the displacement data of a segment lining structure in a similar model test were analyzed in depth based on a field investigation and the analysis of a cracked segment in a metro project. In doing so, we proved the displacement characteristics and bearing capacity of shield tunnel segments with different cracks numbers, lengths, and locations. The results showed that the presence of a crack decreases the overall stiffness of the structure relative to an undamaged segment ring and causes the deformation increases with the same load to increase. One-third of the width of a segment is the demarcation point at which the length of the crack begins to affect the mechanical properties of structure of the lining of the segment. When the length of the crack is larger than one-third the width of the segment, the instability of the structure tends to result in sudden failure. Although an increase in the number of cracks does not reduces the ultimate bearing capacity of the structure further, the deformation of the structure of the lining of the segment increases significantly as the number of cracks increases. compared to a crack at the vault and at the arch waist, the ultimate bearing capacity of the segment is the same when the crack is at the bottom of the arch, but the effects of cracks located at the arch bottom in the structural deformation are the most significant.
Investigation of the Deformation Characteristics and Bearing Capacity of a Segment Structure of a Shield Tunnel with Cracks
https://orcid.org/https://orcid.org/0000-0001-9596-0140
https://orcid.org/https://orcid.org/0000-0002-8275-1937
https://orcid.org/https://orcid.org/0000-0001-5397-1212
https://orcid.org/https://orcid.org/0000-0003-3005-9735
https://orcid.org/https://orcid.org/0000-0002-0758-8383
https://orcid.org/https://orcid.org/0000-0001-9016-0435
In this paper, the displacement data of a segment lining structure in a similar model test were analyzed in depth based on a field investigation and the analysis of a cracked segment in a metro project. In doing so, we proved the displacement characteristics and bearing capacity of shield tunnel segments with different cracks numbers, lengths, and locations. The results showed that the presence of a crack decreases the overall stiffness of the structure relative to an undamaged segment ring and causes the deformation increases with the same load to increase. One-third of the width of a segment is the demarcation point at which the length of the crack begins to affect the mechanical properties of structure of the lining of the segment. When the length of the crack is larger than one-third the width of the segment, the instability of the structure tends to result in sudden failure. Although an increase in the number of cracks does not reduces the ultimate bearing capacity of the structure further, the deformation of the structure of the lining of the segment increases significantly as the number of cracks increases. compared to a crack at the vault and at the arch waist, the ultimate bearing capacity of the segment is the same when the crack is at the bottom of the arch, but the effects of cracks located at the arch bottom in the structural deformation are the most significant.
Investigation of the Deformation Characteristics and Bearing Capacity of a Segment Structure of a Shield Tunnel with Cracks
KSCE J Civ Eng
Liu, Chuankun (author) / Wang, Shimin (author) / Guo, Wenqi (author) / Chen, Fan (author) / Zhang, Junbo (author) / He, Chuan (author)
KSCE Journal of Civil Engineering ; 26 ; 381-393
2022-01-01
13 pages
Article (Journal)
Electronic Resource
English
Mechanical and Deformation Characteristics on Shield Tunnel Segment with Cracks
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