Numerical simulation of longitudinal settlement of shield tunnel in the coastal city Shanghai

Li, Yuan; Cui, Zhen-Dong; Jun, Tan

doi:10.1080/1064119x.2016.1173748

Cited by 10 publications

(7 citation statements)

References 14 publications

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“…In view of this engineering problem, local and international scholars have done a lot of research. The research methods of the influence of surcharge, unloading and excavation on shield tunnel of adjacent subway are mainly divided into field measurement method [3][4][5][6], theoretical analysis method [7][8][9][10][11][12][13][14][15][16][17], numerical analysis method [18][19][20][21][22] and model test method [23][24][25][26][27][28][29], among which the cost of model test method is controllable and the obtained test results are relatively reliable, which is a better method to study the influence of surcharge, unloading and excavation on the shield tunnel of an adjacent subway. Xian Liu et al [23] conducted a full-scale experimental study on the bearing capacity of the shield tunnel structure under overload conditions.…”

Section: Introductionmentioning

confidence: 99%

Model Test on the Influence of Surcharge, Unloading and Excavation of Soft Clay Soils on Shield Tunnels

et al. 2021

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In view of the influence of symmetrical surcharge, unloading and excavation of soft clay soils on shield tunnels, the surface settlement, tunnel settlement, vertical additional earth pressure and tunnel additional confining pressure are measured by an indoor model test. The changes of confining pressure, tunnel settlement, surface settlement and vertical earth pressure caused by surcharge, unloading and excavation are studied and analyzed. The results show that, in soft clay, surcharge will cause tunnel settlement, and unloading and excavation will generally cause tunnel uplift. There is hysteresis in surface settlement and tunnel settlement above the shield tunnel caused by surcharge and unloading; the change of additional confining pressure of the shield tunnel caused by surcharge is mainly concentrated in the three directions of 3, 5 and 7 of the radar chart. These points belong to weak points. Unloading and excavation can effectively reduce the additional confining pressure of the tunnel in these three directions; excavation will cause the increase of vertical cumulative additional earth pressure and tunnel confining pressure in local directions. The influence range of surcharge in soft clay is wider than that in sand, but the depth is relatively shallow.

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Section: Introductionmentioning

confidence: 99%

Model Test on the Influence of Surcharge, Unloading and Excavation of Soft Clay Soils on Shield Tunnels

et al. 2021

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“…At present, the main methods to analyze the influence of surface surcharge loading on the shield tunnel are field measurement method [4][5][6], model test method [7][8][9], theoretical analysis method [10,11], and numerical analysis method [12][13][14][15][16][17]. e deformation and the actual situation of the tunnel can be obtained directly by the field measurement method, but its cost is high and the monitoring process is time-consuming.…”

Section: Introductionmentioning

confidence: 99%

A Three-Dimensional Model of Shield Tunnel considering Interaction of Soil and Lining

Xiao

Wang

2022

Mathematical Problems in Engineering

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The interaction between soil and tunnel lining is an important factor affecting the performance of the tunnel longitudinal structure. In this paper, a three-dimensional model (Model 1) considering the interaction between soil and lining by interface element is built to analyze the response of shield tunnel lining to local surcharge loading. In order to do a comparison, the other model (Model 2) is established without an interface element too. The parametric study of the interface element in Model 1 is carried out, in which parameters such as cohesion, friction angle, normal stiffness, and tangential stiffness are considered. The numerical models are calibrated with experimental results of the model test in the lab obtained from the literature. It is concluded that, among the parameters of the interface element, the changes of cohesion and friction angle have little influence on soil-lining interaction, and the values of normal stiffness and tangential stiffness are more important in simulating soil-lining interaction. The maximum settlement of the tunnel is generally located in the center of the load, and the settlement is symmetric about the center of the load. With the increase of stiffness of soil, the trend of the longitudinal settlement of tunnel is similar, and the maximum settlement of tunnel decreases gradually. The result of Model 1 is much closer to experiment results than Model 2. The general deformation in Model 1 is smaller than the one in Model 2, and the slippage between the soil and lining can be found clearly in Model 1. Because of the interface element in Model 1, the restrain of soil around the lining can be simulated better. Through an engineering project, it can be found that the tunnel deformation can be predicted by the three-dimensional model considering the interaction between soil and lining by interface element well.

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“…The longitudinal affects the safe operation of the subway, which has also been widely studied through field monitoring, numerical analysis and analytical solution [1][2][3][4][5]. The research on the tunnel longitudinal performance focuses on the longitudinal settlement and horizontal axis deviation, which are caused by the coupling effects of multi-load [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Huang et al [23] developed a finite element method for analyzing the longitudinal performance of shield tunnels considering the longitudinal variation of geotechnical parameters. Yuan et al [9] analyzed the deformation of the shield tunnel and the surrounding soil by building a three-dimensional model of shield tunnel. A numerical model was established to simulate the earth pressure balance (EPB) in excavation processes-the simulation results were compared with those obtained by the field measurement [24,25].…”

Section: Introductionmentioning

confidence: 99%

Study on the Horizontal Axis Deviation of a Small Radius TBM Tunnel Based on Winkler Foundation Model

Qiao

Liu

et al. 2020

Applied Sciences

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During the construction stage of the small radius TBM (tunnel boring machine) interval, the improper control of the boring parameters and the boring posture can cause the horizontal axis deviation of the shield tunnel. In order to address this issue, the TBM segments lining structure of the small radius interval is simplified as the continuous circular curved beam based on the longitudinal equivalent continuous model and Winkler elastic foundation beam theory. The theoretical model is solved through the transfer matrix method, and its applicability is verified by comparing it with the field monitoring data. It is found that the horizontal axis deviation of the completed tunnel increases with the total jack thrust, and the lateral displacement tends to be stable when the distance between the ring and the tail is far. The horizontal axis deviation has a negative relationship with the thrust difference or path difference when the jack thrust in the outside of the shield curve is larger than that of inside the shield curve. The horizontal axis deviation has a positive relationship with the thrust difference or path difference when the jack thrust in the outside of the shield curve is smaller than that of inside the shield curve.

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Numerical simulation of longitudinal settlement of shield tunnel in the coastal city Shanghai

Cited by 10 publications

References 14 publications

Model Test on the Influence of Surcharge, Unloading and Excavation of Soft Clay Soils on Shield Tunnels

Model Test on the Influence of Surcharge, Unloading and Excavation of Soft Clay Soils on Shield Tunnels

A Three-Dimensional Model of Shield Tunnel considering Interaction of Soil and Lining

Study on the Horizontal Axis Deviation of a Small Radius TBM Tunnel Based on Winkler Foundation Model

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