Investigation on the tail brush induced loads upon segmental lining of a shield tunnel with small overburden

Ye, Guanlin; Han, Lei; Yadav, Santosh Kumar; Bao, Xiaohua; Liao, Chencong

doi:10.1016/j.tust.2020.103283

Cited by 18 publications

(2 citation statements)

References 26 publications

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“…ere are several summaries in the literature on the cracking and damage of segmental linings in the construction stage [19,[48][49][50]. Longitudinal cracks, a common cracking pattern in tunnel segment linings, are mainly caused by various construction loads [51]. Typical cracking patterns in tunnel construction are shown in Figure 3 and mainly include cracks formed by external force intrusion into a curved tunnel with a small radius, the reaction force between jacks and adjacent segments in a tunnel with a large radius [52], and unsymmetrical pressure during mortar injection [53].…”

Section: Analysis Of Cracking and Deformationmentioning

confidence: 99%

State‐of‐the‐Art Review on Failure Mechanism and Waterproofing Performance of Linings for Shield Tunnels

Tang

2022

Advances in Civil Engineering

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The introduction and development of shield tunnels have led to the innovation of precast segmental linings, which has significant advantages in improving the construction speed compared with in-situ cast concrete linings. However, damage of the linings and water leakage at the lining joints highlight defects in the design and construction of the linings. In this regard, it is necessary to investigate the failure mechanism of linings for shield tunnels and evaluate the waterproofing performance and repercussions of lining joints. The relevant research results published in recent years are reviewed in this paper, focusing on the failure mechanisms of linings and the waterproofing performance of lining joints. Progressive failure and instability of linings are introduced. Progressive failure has three stages: initial elastic stage, local damage stage, and overall failure stage. The performance-based design of joint waterproofing is described in seven steps. Further opportunities for the investigation of this topic are discussed.

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Section: Analysis Of Cracking and Deformationmentioning

confidence: 99%

State‐of‐the‐Art Review on Failure Mechanism and Waterproofing Performance of Linings for Shield Tunnels

Tang

2022

Advances in Civil Engineering

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“…Apart from the production and the transportation and the segment quality (15.2%), the other factors are determined by the excavation progress during the construction period, which includes the assembling quality of the segment itself, the jacking forces, the synchronous grouting pressure, and the attitude deviation between shield machine and segments. Ye et al (2020) also indicate the three main construction actions that frequently produced longitudinal cracks, including the invasion of shield tail at small curvature radius tunnel, the jack thrusting of large shield tunnel, the unsymmetrical pressure from the backfill grouting pressure. Compared with the loads acting on the tunnel lining at the service period, the loads and the constraints during the construction period are more complex and variable along the longitudinal direction of the tunnel and are applied by the jack system, shield tail wire brush, slurry and ground (Fig.…”

Section: Introductionmentioning

confidence: 99%

The Buoyancy of the Tunnel Segmental Lining in the Surrounding Filling Material and its Effects on the Concrete Stress State

Han

Oreste

2022

Geotech Geol Eng

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Segmental lining is subject to significant upward buoyancy forces when a grouting material (slurry), initially fluid, is adopted to fill the gap between its external profile and the wall of a tunnel excavated with a TBM machine. The analysis of the effects of these forces is important in order to correctly dimension the segmental lining and avoid damage to the lining and subsequent costly maintenance and restoration actions. Given the complexity of the behavior of a segmental lining consisting of segmental rings and circular joints that alternate in the longitudinal direction of the tunnel, a specific numerical model has been implemented, adopting the Finite Element Method (FEM). This model is able to obtain the development of the vertical displacements of the segmental lining starting from the TBM tail, together with the bending moments and the shear forces induced inside it. The developed model is able to assess the risks of breaking and damaging the concrete and steel bolts that are used to connect the segmental rings at the circular joints; therefore, it represents a useful design tool for being able to correctly dimension the segmental lining also in relation to the risks produced by the appearance of considerable buoyancy forces around it, due to the presence of the initially fluid filling material. The proposed numerical model was applied to a real case (Ningbo metro tunnel) and allowed to obtain satisfactory results from the comparison of the calculated displacements with in situ measurements. Some sensitivity analyzes developed on the studied case have made it possible to detect which are the influencing parameters that have the greatest impact on the behavior of segmental lining in the presence of the studied buoyancy forces.

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Mechanical Behaviors of Segments in Small Curvature Radius Intervals of Shield Tunnels: From Field Monitoring to Laboratory Testing

Gao

Qiu

et al. 2023

Rock Mech Rock Eng

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Investigation on the tail brush induced loads upon segmental lining of a shield tunnel with small overburden

Cited by 18 publications

References 26 publications

State‐of‐the‐Art Review on Failure Mechanism and Waterproofing Performance of Linings for Shield Tunnels

State‐of‐the‐Art Review on Failure Mechanism and Waterproofing Performance of Linings for Shield Tunnels

The Buoyancy of the Tunnel Segmental Lining in the Surrounding Filling Material and its Effects on the Concrete Stress State

Mechanical Behaviors of Segments in Small Curvature Radius Intervals of Shield Tunnels: From Field Monitoring to Laboratory Testing

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