Three-dimensional finite-element analysis on ground responses during twin-tunnel construction using the URUP method

Zhang, Z.X.; Liu, Chao; Huang, Xin; Kwok, C. Y.; Teng, Liwei

doi:10.1016/j.tust.2016.05.001

Cited by 71 publications

(24 citation statements)

References 26 publications

(30 reference statements)

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“…A typical "step-by-step" approach was adopted to simulate the shield construction process [13,53,54]. e numerical modelling consisted of three key steps, i.e., shield tunneling, lining assembly, and shield tail grouting.…”

Section: Numerical Procedurementioning

confidence: 99%

A Comparative Study of Protective Schemes for Shield Tunneling Adjacent to Pile Groups

Lai

et al. 2020

Advances in Civil Engineering

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Shield tunneling adjacent to pile groups is always an unavoidable problem in urban metro construction. A case was found in the project of Tianjin Metro Line 7, where a shield tunnel would be constructed near the existing pile groups of Shiyou Bridge. The whole shield tunnel is close to pile groups, and the minimum distance is only 0.8 m. Therefore, four kinds of protective schemes are proposed in this paper. It is vital to select an appropriate protective scheme to guarantee the safety during the tunnel construction. In this study, the main mechanical characteristic and physical parameters of site soil were obtained through laboratory tests. Besides, the three-dimensional finite element method was carried out to compare and analyze the effectiveness of the protective schemes in mitigating the effects of tunneling on adjacent pile groups. The results show that the deep-hole grouting scheme has better control effect on the lateral deformation and bending moment of piles, while the pile foundation underpinning scheme has better effectiveness on reducing the settlement of bridge structure and ground deformation. Finally, the deep-hole grouting reinforcement scheme will be adopted to ensure the shield passing through the pile groups smoothly.

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Section: Numerical Procedurementioning

confidence: 99%

A Comparative Study of Protective Schemes for Shield Tunneling Adjacent to Pile Groups

Lai

et al. 2020

Advances in Civil Engineering

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“…Initial displacements can be measured with inclinometers installed in advance of tunnelling. Several application examples are known, although mostly for shallow tunnels in soft ground [1] [2] [3] [4]. In the Ahrental and Wolf areas of the Brenner Base Tunnel (Figure 1), the…”

Section: Measurement Of the Displacement Profile In The Longitudinal mentioning

confidence: 99%

Validation of longitudinal displacement profiles by measurement at the Brenner Base Tunnel

Schneider‐Muntau

Reinhold²,

Cordes³

et al. 2018

Geomechanics and Tunnelling

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Longitudinal displacement profiles describe the displacement history during tunnel excavation, including that occurring ahead of the tunnel face. These deformations have an influence on the structural design of tunnel support. Theoretical approaches are used to estimate these deformations. However, as the approaches are based on assumptions, they should be applied with caution, particularly in case of deep tunnels. Therefore, experimentally determined longitudinal displacement profiles provide a valuable data basis for validation of the approaches. This study compares 40 m long horizontal chain inclinometer measurements in two lithologies in the exploration tunnel of the Brenner Base Tunnel with theoretically calculated profiles. The chain inclinometers were installed above the tunnel before the start of tunnelling. A measured radial displacement profile was created for each round, the statistical mean value curve was calculated and finally compared with the theoretical approaches. The measurement results show good qualitative agreement ahead of the tunnel face.

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“…Liu et al [35] studied the influence of tunnel excavation on adjacent single pile and pile foundation with ABAQUS finite element software, taking the Shanghai metro line 3 project as the background, and most of the relevant factors in tunnelling are taken into consideration including slurry pressure, grouting pressure, grouting material hardening, and soil-pile interaction. Zhang et al [36] performed three-dimensional finite element analysis for URUP to observe the ground settlement and lateral displacement due to twin-tunnel excavation in silty clay, and a critical cover depth of 0.55D is proposed for the URUP method below which value instability and collapse of surrounding soils will be highly likely. Michael et al [31] studied the effects of slurry TBM operational parameters on ground deformation by analyzing field data and computational modelling, and the results quantify the importance of the various pressures on controlling ground deformation.…”

Section: Introductionmentioning

confidence: 99%

Performance of Slurry Shield Tunnelling in Mixed Strata Based on Field Measurement and Numerical Simulation

Cui

Fang

et al. 2020

Advances in Materials Science and Engineering

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There are severe challenges for slurry pressure balance tunnel boring machine (TBM) tunnelling in sandy cobble soil of Beijing, Chengdu, and Lanzhou in China. And the problems caused by tunnelling from silty clay to sandy cobble stratum are more serious. With the change of stratum, the key parameters and surface settlement will change correspondingly. Controlling the key parameters and predicting the surface settlement accurately and efficiently is important for hazard mitigation and risk management. In this study, based on the Tsinghuayuan Tunnel project in Beijing, the key parameters and surface settlement while tunnelling from silty clay to sandy cobble stratum are studied. Firstly, the difference of key parameters while tunnelling in two different strata is analyzed. The analysis shows that immediate responses to changes in the stratum are recommended in order to ensure construction efficiency. Then, a refined 3D finite difference model is developed to simulate the slurry TBM tunnelling in different strata. For refined simulation, three key parameters obtained from measurement data were applied to the 3D models, and the simulation results were compared with the field data. Results show that the refined model has good performance in terms of the accuracy and efficiency. This study provides a good engineering practice reference for slurry TBM tunnelling in mixed strata.

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Three-dimensional finite-element analysis on ground responses during twin-tunnel construction using the URUP method

Cited by 71 publications

References 26 publications

A Comparative Study of Protective Schemes for Shield Tunneling Adjacent to Pile Groups

A Comparative Study of Protective Schemes for Shield Tunneling Adjacent to Pile Groups

Validation of longitudinal displacement profiles by measurement at the Brenner Base Tunnel

Performance of Slurry Shield Tunnelling in Mixed Strata Based on Field Measurement and Numerical Simulation

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