Structural responses and treatments of shield tunnel due to leakage: A case study

Liu, Dejun; Wang, Fei; Hu, Qunfang; Huang, Hongwei; Zuo, Jianping; Tian, Cong; Zhang, Dong Ming

doi:10.1016/j.tust.2020.103471

Cited by 62 publications

(15 citation statements)

References 25 publications

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“…Huang et al (2020) reported a soil-water rush causing differential displacements and the lining damage in Tianjin Metro Line 1 (China), and observed that the maximum value of the ground surface settlement, the tunnel crown displacement and the lateral convergence were about 119 mm, 3.8 mm and 22 mm respectively. Liu et al (2020a) discussed about an accident occurred in a leakage location inside a tunnel during freezing construction, which lead to the uneven settlement and the concrete spalling along the circumferential joints. These cases describe that the obvious change of lateral force applied on the segmental lining leads to differential displacements which result in the dislocation and rotation between the lining rings and further causes the damage of lining joints.…”

Section: Introductionmentioning

confidence: 99%

The important role of stiffnesses values of circular joints on the stress state developed in the tunnel segmental lining

Han

Oreste

2023

Geomech. Geophys. Geo-energ. Geo-resour.

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Under the application of the fluctuating Tunnel Boring Machine (TBM) jack thrust and the non-uniformly distributed total pressure of the slurry around the lining, the bending and the shear deformation occur on the segmental lining along the longitudinal direction, which cause a stress concentration and increase the damage risk of the segmental tunnel lining. The analysis of the circular joint stiffness is a critical step during the evaluation of the stress state of the segmental lining so as to decrease the associated risk of damage. In order to investigate the lining rings and the circular joint separately, an integrated numerical model which is composed of segment elements and joint elements was developed. Furthermore, stiffness equations for describing in the detail the circular joint behaviour of the tunnel segmental lining are derived. The new stiffness equation of the circular joint is also used to analyse the segment lining behaviour based on a well-known indoor test result by the scientific literature, and satisfactory results were obtained. A simplified estimation of the bending stiffness of the circular joint based on the Boltzmann equation is then suggested in order to obtain quickly its calculation. Finally, based on a specific numerical model, the calculated joint stiffnesses are adopted to analyse the vertical displacement of a real case (The Ningbo metro tunnel in China). Through a developed sensitivity analysis, some useful suggestions are proposed to reduce the damage risk of the segmental lining.

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Section: Introductionmentioning

confidence: 99%

The important role of stiffnesses values of circular joints on the stress state developed in the tunnel segmental lining

Han

Oreste

2023

Geomech. Geophys. Geo-energ. Geo-resour.

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“…Shield tunneling has many advantages, such as high efficiency of mechanized construction and a small effect on the underground pipeline, pile foundation, ground deformation and ground traffic. Therefore, this method is often considered the best choice for subway tunnel construction (Liu et al, 2020;Lv et al, 2020;Yang et al, 2020;Cui et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Influence of grouting pressure volatility on additional response of adjacent pile foundation in shield construction

Zhang¹,

Li²,

Zhang³

et al. 2022

Journal of Theoretical and Applied Mechanics

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Soil parameters along the heading direction are subjected to spatial variability during shield construction, so grouting pressure requires constant adjustment to ensure ground stress stability. This causes grouting pressure to fluctuate around the design pressure/curve. Therefore, the influence of the grouting pressure volatility on the adjacent loaded-pile foundation should be considered in shield tunneling. In this study, a refined numerical simulation of the shield construction process is conducted using the Fast Lagrangian Analysis of Continua in Three Dimensions (FLAC3D) software. A total of 300 groups of grouting pressure parameters with a skewed normal distribution are input into the numerical model. Then, the influence of the construction parameter uncertainty on the adjacent loaded-pile foundation is analyzed. Finally, the back analysis method is conducted based on the monitored data to evaluate how the construction process affects the pile foundation. The calculation results are compared with those of the traditional finite element method. The results indicate that in the tunneling process, the grouting pressure fluctuation greatly affects the additional bending moment of the adjacent pile foundation. Under the influence of the grouting pressure, the additional axial force and additional bending moment of the pile foundation also follow the skewed normal distribution. The back analysis results of the pile foundation are greater than those of the typical numerical method by about 60% 100%, that is using the back analysis calculation results to evaluate the pile foundation additional response can reduce the risk.

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“…At present, the research on the relationship between longitudinal deformation and defect in tunnels focuses on 2D longitudinal deformation curves, especially settlement. Longitudinal settlement causes joint dislocation and opening, which will probably lead to stress concentration, lining damage, and stiffness loss, causing bolt failure and leakage [ 5 , 6 ]. In turn, the occurrence of leaks and other defects will promote consolidation settlement in the geotechnical body [ 7 ], triggering an increasing longitudinal differential settlement [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel Detection and Assessment Method for Operational Defects of Pipe Jacking Tunnel Based on 3D Longitudinal Deformation Curve: A Case Study

Lin

Xie

2022

Sensors

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Adjacent tunnel construction and environmental disturbances can lead to longitudinal deformation in pipe-jacking tunnels. The longitudinal deformation of the tunnel is closely related to the occurrence of joint dislocation, joint opening, and other defects. In view of the difficulty of obtaining 3D longitudinal deformation curves, a method is proposed to obtain 3D longitudinal deformation curves based on a large number of 3D point cloud data with high spatial resolution and large spatial dimensions. Combined with the mechanism of defects occurrence, a theoretical basis for tunnel defects assessment based on tunnel longitudinal deformation is proposed. Taking one pipe jacking tunnel as an example, the longitudinal settlement curve and the 3D longitudinal deformation curve are compared. The correlation between the 3D longitudinal deformation curve and defects such as mud leakage, cracks, and differential deformation is illustrated from the perspective of three indexes: deformation amount, bending deformation, and shearing deformation. The accuracy and reliability of the 3D longitudinal deformation curve in tunnel defects detection and assessment are verified.

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Structural responses and treatments of shield tunnel due to leakage: A case study

Cited by 62 publications

References 25 publications

The important role of stiffnesses values of circular joints on the stress state developed in the tunnel segmental lining

The important role of stiffnesses values of circular joints on the stress state developed in the tunnel segmental lining

Influence of grouting pressure volatility on additional response of adjacent pile foundation in shield construction

A Novel Detection and Assessment Method for Operational Defects of Pipe Jacking Tunnel Based on 3D Longitudinal Deformation Curve: A Case Study

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