Field measurement analysis of the influence of double shield tunnel construction on reinforced bridge

Wang, Zhe; Kaiwei, Zhang; Wei, Gang; Li, Bin; Li, Qiang; Yao, Wangjing

doi:10.1016/j.tust.2018.06.018

Cited by 40 publications

(13 citation statements)

References 16 publications

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“…The FEM mesh consisted of 10,010 nodes and 9480 elements (six-and eight-node linear brick), conditioned with appropriate boundary conditions. The upper surface corresponding to the effective ground was free to move, for which the pressure induced by the self-gravity of the EPB-S machine was taken into account by applying a constant distributed load equal to 20 kPa [1,32] (additional thrust p). The interactive behavior of the shield-soil wall due to the effects of fluid injections from the shield head was conditioned with an additional friction force τ (45 kPa) [33,34].…”

Section: Applicationmentioning

confidence: 99%

Constitutive Modeling of Physical Properties of Coastal Sand during Tunneling Construction Disturbance

Zhu

Zhao

et al. 2021

JMSE

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This paper presents a simple but workable constitutive model for the stress–strain relationship of sandy soil during the process of tunneling construction disturbance in coastal cities. The model was developed by linking the parameter K and internal angle φ of the Duncan–Chang model with the disturbed degree of sand, in which the effects of the initial void ratio on the strength deformation property of sands are considered using a unified disturbance function based on disturbed state concept theory. Three cases were analyzed to investigate the validity of the proposed constitutive model considering disturbance. After validation, the proposed constitutive model was further incorporated into a 3D finite element framework to predict the soil deformation caused by shield construction. It was found that the simulated results agreed well with the analytical solution, indicating that the developed numerical model with proposed constitutive relationship is capable of characterizing the mechanical properties of sand under tunneling construction disturbance.

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Section: Applicationmentioning

confidence: 99%

Constitutive Modeling of Physical Properties of Coastal Sand during Tunneling Construction Disturbance

Zhu

Zhao

et al. 2021

JMSE

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“…It took 5 days for shield machine to cross under the existing tunnels in upline construction, but took 8 days for downline construction. Shorter construction time is more likely to reduce the disturbance to the soil [45]. Smaller earth chamber pressure, total thrust, and grouting volume may also result in the less impact of superposition effect of the second shield crossing.…”

Section: Comparison Of the Maximum Longitudinal Settlement Ofmentioning

confidence: 99%

Deformation Characteristics of Existing Twin Tunnels Induced by Double Shield Undercrossing with Prereinforcement: A Case Study in Hangzhou

Wei

Zhang

et al. 2021

Advances in Civil Engineering

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This paper is based on the case of the earth pressure balance (EPB) shield tunnelling project of the new Metro Line 2 undercrossing the existing Metro Line 1 in the soft soil urban area of Hangzhou. Because the EPB shield must break through a plain concrete wall before undercrossing the existing tunnels, the pipe roof prereinforcement was adopted to stabilize the soil between the existing tunnels and the new shield tunnel. The deformation characteristics of the existing tunnels in the process of double shield undercrossing were discussed. According to the variation of shield position, the settlement development could be divided into three stages: shield approaching subsidence, shield crossing heave, and shield leaving subsidence. The horizontal displacement shows a back and forth variation characteristic consistent with the direction of shield tunnelling. At the junction of tunnel and station, the shield undercrossing caused considerable differential settlement between the existing tunnel and the station. The construction of pipe roof prereinforcement will lead to the presettlement of the existing tunnels. The settlement of the existing tunnels caused by the attitude deviation of pipe roof and grouting disturbance should be reduced in reasonable ranges. In addition, the maximum longitudinal settlement of the existing tunnel during the shield second undercrossing was also discussed. It was considered that the influence of wall breaking is greater than the sequence of shield undercrossing. The driving parameters of shield tunnelling should be optimized before the second crossing.

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“…e results illustrated that pile settlement and failure mechanisms are highly dependent on the load redistribution that occurs between piles during tunnel volume loss, which are related to structure weight and stiffness. Wang et al [14] studied the construction schemes and influence of shield tunneling on reinforcing and rebuilding bridges in the case of shield tunnel of Hangzhou Metro 2 crossing through Fengqi Bridge. Sirivachiraporn and Phienwej [15] analyzed the field measurement data of the first Bangkok subway project to evaluate the ground movement characteristics and responses of adjacent buildings.…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Construction Sequences on Ground Surface Settlement and Displacement of Single Long Pile due to Twin Paralleled Shield Tunneling

Huang

Sun

Huang

et al. 2021

Advances in Civil Engineering

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Shield tunneling activities inevitably pass through pile foundations at close distance in densely urban areas. Various studies have investigated the interaction between newly constructed tunnels and existing pile foundations. However, the influence of different construction sequences of twin paralleled shield tunneling on single long pile is seldom considered. A case was found in the project of Changsha Metro Line 5, where the twin paralleled tunnels were constructed near the Wanjiali Viaduct piles. A three-dimensional finite element model was established to analyze the pier settlement, ground surface settlement trough, and the vertical and horizontal displacement of pile under different construction sequences in layered soil. The results show that the adjacent pile and surrounding environment are affected substantially with the change of construction sequence of twin paralleled tunnels. The construction sequence of condition (b), in which the tunnel closer to the pile foundation is first constructed and then the tunnel farther away from the pile foundation is second constructed, can reduce the settlement of pier by 13.1%, the maximum surface settlement by 7.0%, the maximum vertical displacement of pile foundation by 7.9%, and the maximum horizontal displacement by 6.9%. The present findings can provide reference for similar projects.

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Field measurement analysis of the influence of double shield tunnel construction on reinforced bridge

Cited by 40 publications

References 16 publications

Constitutive Modeling of Physical Properties of Coastal Sand during Tunneling Construction Disturbance

Constitutive Modeling of Physical Properties of Coastal Sand during Tunneling Construction Disturbance

Deformation Characteristics of Existing Twin Tunnels Induced by Double Shield Undercrossing with Prereinforcement: A Case Study in Hangzhou

Effects of Different Construction Sequences on Ground Surface Settlement and Displacement of Single Long Pile due to Twin Paralleled Shield Tunneling

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