Tunnel segment uplift model of earth pressure balance shield in soft soils during subway tunnel construction

Zhou, Shunhua; Chang, Jiang

doi:10.1080/23248378.2014.966420

Cited by 18 publications

(12 citation statements)

References 8 publications

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“…e segment uplift behavior is not affected by the advancing rate of the shield machine according to the study by Zhou and Ji [15]. e reasonable explanation is that the segment uplifting occurs while the shield machine stands still for segment installing.…”

Section: Mechanical Modelmentioning

confidence: 91%

“…Hashimoto et al [13,14] came to conclusion that the pressure of the lining is related to the dissipation rate of the grouting pressure. Zhou and Ji [15] concluded that the chamber pressure, advance rate, and total thrust have little influence on segment uplift, but the grouting pressure and grout composition are the most sensitive influencing factors on segment uplift. In addition, the numerical method is favored for studying the mechanism of segment lift, for example, the two-dimensional simulations conducted by Zhang et al [16] and three-dimensional simulations presented by Kasper and Meschke [17].…”

Section: Introductionmentioning

confidence: 99%

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Pasternak Model‐Based Tunnel Segment Uplift Model of Subway Shield Tunnel during Construction

Tao

Yunhe

Zhu

et al. 2021

Advances in Civil Engineering

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Segment uplift is a frequent problem during the construction of shield tunnels. The phenomenon of segment uplift in Xuzhou Metro Line 1 is investigated. The segment uplift magnitude in the shale layer is quite smaller than that in the clay layer. A tunnel segment uplift calculation model based on the Pasternak foundation beam model is proposed, which considers the hardening process of the grouted body with time. The finite difference method is adopted to calculate the magnitude of segment uplift during different tunnel construction stages, and a numerical solution of segment uplift on the longitudinal direction is obtained. The applicability of the numerical solution is studied by comparing with the field test results and parametric analyses are also performed to investigate the eﬀects of diﬀerent factors on segment uplifting. The results show that the coefficient of subgrade modulus, shear stiffness of the shear layer, and grout pressure all influence the segment uplifting of the tunnel. The influence of the coefficient of subgrade modulus and grout pressure on segment uplift is more significant.

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Section: Mechanical Modelmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Pasternak Model‐Based Tunnel Segment Uplift Model of Subway Shield Tunnel during Construction

Tao

Yunhe

Zhu

et al. 2021

Advances in Civil Engineering

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show abstract

“…The shield tunnel was built in a soft soil, and the uplift of the segmental lining was detectable during the tunnel excavation. Zhou and Ji (2014) measured this upward movement and found that the maximum value achieved 120 mm at some segments. The adopted basic parameters of bolts are listed in the Table 4, on the basis of the available documents in the scientific literature (Chen et al 2018;Ji et al 2014Ji et al , 2013Ye et al 2014;Zhou et al 2013;Zhou and Ji, 2014).…”

Section: Application Of the Proposed Model To A Real Casementioning

confidence: 98%

“…Based on preliminary field test results, the influence of the vertical component of jack thrust, of the pressure chamber and of the advance rate of the TBM on the lining uplift was insignificant and for this reason these aspects were neglected in the subsequent analysis; the slurry characteristics, on the contrary, have a significant influence (Zhou and Ji 2014). The composition of the adopted slurry include cement, bentonite, sand, fly ash, quick lime, water and admixture.…”

Section: Application Of the Proposed Model To A Real Casementioning

confidence: 99%

“…The normal force is applied by the jack thrust and can change during the excavation and segment assembling steps. Because the maximum thrust reached in the studied case was 9.46 MN (Zhou and Ji 2014), the normal force N applied to the lining was considered changing from 0 to 9.46 MN. When the normal force N respectively is equal to 0 and 9.46MN, the bending moments and the shear forces in the segmental lining along the tunnel axis are shown in Figs.…”

Section: Application Of the Proposed Model To A Real Casementioning

confidence: 99%

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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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The Detection of the Boulders in Metro Tunneling in Granite Strata Using a Shield Tunneling Method and a New Method of Coping with Boulders

et al. 2016

Geotech Geol Eng

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Tunnel segment uplift model of earth pressure balance shield in soft soils during subway tunnel construction

Cited by 18 publications

References 8 publications

Pasternak Model‐Based Tunnel Segment Uplift Model of Subway Shield Tunnel during Construction

Pasternak Model‐Based Tunnel Segment Uplift Model of Subway Shield Tunnel during Construction

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

The Detection of the Boulders in Metro Tunneling in Granite Strata Using a Shield Tunneling Method and a New Method of Coping with Boulders

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