Failure analysis of a new-type shield tunnel based on distributed optical fiber sensing technology

Zhang, Junchen; Yan, Qixiang; Li, Weiping; Su, Liufeng; Sun, Mingfei; Yao, Chaofan

doi:10.1016/j.engfailanal.2022.106748

Cited by 10 publications

(5 citation statements)

References 16 publications

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“…Shield tunnel is a slender 3D tubular structure, which is prone to uneven deformation in the longitudinal direction, [1][2][3] especially with the increase of tunnel diameter and the complexity of crossing stratum conditions. The longitudinal deformation of the shield tunnels is mainly manifested in the dislocation and opening deformation of the circumferential joints, 4 so it is necessary to investigate the mechanical behavior of circumferential joints.…”

Section: Introductionmentioning

confidence: 99%

“…process of segments through prototype tests. In addition, there were some segments with circumferential joints connected by straight bolts and locating dowels, of which the shear resistance properties were investigated by the fullscale test 4 and numerical calculation. 16 The circumferential joints equipped with distributed mortises and tenons in shield tunnels with super-large cross section.…”

Section: Introductionmentioning

confidence: 99%

“…However, in the existing research, due to the limitation of the test loading equipment, the shear test of the circumferential joints under a specific shear force direction is usually carried out. 3,4,11,12 On the other hand, the jacking force causes the tunnel to be subjected to obvious precompression stress in the longitudinal direction during the construction of shield tunnels, and the longitudinal force is constantly changing with time and space. In the existing studies, due to the limitation of the test conditions, only the shear test of the circumferential joints under a certain longitudinal force is often carried out.…”

Section: Introductionmentioning

confidence: 99%

“…For the circumferential joints with distributed mortises and tenons, Liu et al 14 and Zhang et al 15 investigated the mechanical behavior and failure process of segments through prototype tests. In addition, there were some segments with circumferential joints connected by straight bolts and locating dowels, of which the shear resistance properties were investigated by the full‐scale test 4 and numerical calculation 16…”

Section: Introductionmentioning

confidence: 99%

“…Whats' more, for the segment structures with distributed mortises and tenons, the direction of the shear force received by each mortise and tenon is different when two adjacent segment rings are shifted along a certain direction. However, in the existing research, due to the limitation of the test loading equipment, the shear test of the circumferential joints under a specific shear force direction is usually carried out 3,4,11,12 . On the other hand, the jacking force causes the tunnel to be subjected to obvious precompression stress in the longitudinal direction during the construction of shield tunnels, and the longitudinal force is constantly changing with time and space.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Investigation on the shear performance of circumferential joints of segments in super‐large cross‐section shield tunnels

Guo

Feng

Zhou

et al. 2023

Structural Concrete

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To investigate the shear performance of the circumferential joints equipped with inclined bolts and distributed mortises and tenons, a 3D refined numerical calculation model was established. After verification with the full‐scale tests, the shear mechanical behavior of the circumferential joints under shear force in different directions and different longitudinal force was investigated. The results have proven that the evolution of joint dislocation with shear force can be divided into three stages, and the shear stiffness of circumferential joints varies greatly in these three stages. The direction of shear force mainly affects the shear stiffness of the second stage. The mechanical behavior of bolts under shear force in different directions shows significant differences, which is the main reason for the difference of shear stiffness of joints. The failure characteristic of the circumferential joint is mainly the concrete crushing at the mortise. The longitudinal force mainly affects the shear stiffness of the first stage.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation on the shear performance of circumferential joints of segments in super‐large cross‐section shield tunnels

Guo

Feng

Zhou

et al. 2023

Structural Concrete

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An analytical solution for shear bearing capacity of circumferential joints of precast concrete segmental tunnel linings considering dowel action

Amjad,

Zhang,

Liu

2024

Structural Concrete

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The capacity of the circumferential joint of the precast concrete segmental tunnel lining (PCTL) structure in terms of shear performance principally includes the dowel action by connector/bolt as well as friction force, and it is a vital parameter to assess the mechanical response of the circumferential joint. Further, as there was no analytical model available for precise estimation of a circumferential joint in terms of the shear‐bearing capacity considering the dowel action of the bolt in the presence of axial/normal force, therefore in this investigation, an analytical model has been proposed to estimate the shear‐bearing capacity of the circumferential joint. Furthermore, the analytical model's precision and accuracy were validated via large‐scale experimental investigation on a circumferential joint of PCTL. Upon comparing analytical model outcomes with experimental results, absolute error varied between +5% and −9%, with an average value of the coefficient of friction at the yield point of the bolt. Moreover, the formation of hinges on the side of the bolt within the segment was considered a failure of the circumferential joint. Additionally, the parametric investigation revealed that with just a 1% change in axial force, the diameter, pre‐tightening, and yield strength of the bolt and concrete strength improved by 2.85%, 1%, 0.27%, 0.26% and 0.17% shear‐bearing capacity of the circumferential joint respectively. Axial force variation greatly influences the shear‐bearing capacity of circumferential joint followed by diameter, pre‐tightening, yield strength of the bolt, and concrete strength. Conclusively, with analysis of axial force distribution around the ring for the tunnel, the proposed model has been applied to a full ring to estimate shear bearing capacity.

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Experimental investigation on the damage evolution and failure mechanism of segmental joints based on DOFS and AE

Guo

Feng

et al. 2023

Engineering Failure Analysis

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Failure analysis of a new-type shield tunnel based on distributed optical fiber sensing technology

Cited by 10 publications

References 16 publications

Investigation on the shear performance of circumferential joints of segments in super‐large cross‐section shield tunnels

Investigation on the shear performance of circumferential joints of segments in super‐large cross‐section shield tunnels

An analytical solution for shear bearing capacity of circumferential joints of precast concrete segmental tunnel linings considering dowel action

Experimental investigation on the damage evolution and failure mechanism of segmental joints based on DOFS and AE

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