Development of tunneling influence zones for adjacent pile foundations by numerical analyses

Jongpradist, Pornkasem; Kaewsri, Theerapong; Sawatparnich, Attasit; Suwansawat, Suchatvee; Youwai, Sompote; Kongkitkul, Warat; Sunitsakul, Jutha

doi:10.1016/j.tust.2012.11.005

Cited by 89 publications

(28 citation statements)

References 19 publications

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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 Proceduresmentioning

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 Proceduresmentioning

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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“…[12]. The properties of soils and material parameters for the simulations in Bangkok subsoil are calibrated by [13][14] and has been used in previous research [15].  are tunnel diameters before and after the effect of pile rows under loading, respectively.…”

Section: Initial Conditionsmentioning

confidence: 99%

Investigation on pile-soil-tunnel interaction due to adjacent loaded pile row by 3D FEM

et al. 2018

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Abstract. The effect of adjacent loaded pile row on the existing tunnel is analysed by 3D finite element method. The MRTA project is used as reference case in this study. The case study is divided into two cases, tunnel and pile tip located in soft clay and stiff clay, respectively. The pile diameter of 1 m and pile tip located at the elevation of tunnel crown with various number of piles within the row were considered. The analysis results are shown in terms of total soil displacement (without tunnel) and maximum tunnel deformations. Both total soil displacements and tunnel deformation increase with the number of piles and approach a maximum value when the number of piles is greater than 13 and 11 for cases tunnel in soft and stiff clay, respectively. This reveals that the tunnel deformation mechanism is primarily due to the soil displacement.

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“…The properties of soils are determined from MRT projects [14]. The material parameters for the simulations of geotechnical work in Bangkok subsoil are calibrated by [15] and has been used in previous research [16]. Table 1 Material properties of the bore pile, tunnel lining and grouting layer [16].…”

Section: Model Parametersmentioning

confidence: 99%

Investigation on Tunnel Responses Due to Adjacent Loaded Pile by 3d Finite Element Analysis

Heama¹,

Jongpradist²,

Lueprasert³

et al. 2017

GEOMATE

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Underground structures are popularly utilized in urban development, especially tunnels for both transportation and utilities. The interaction problem between existing tunnel and piles from new constructed structures thus becomes unavoidable in dense population area. The tunnel loses its stability if the additional forces and changed diameters (due to adjacent piles under loading) of tunnel lining are drastically high. This depends on many factors, such as the clearance and pile tip level with respect to tunnel position. For preliminary assessment during the first stage of design, it is necessary to estimate this impact. The concept of tunnel protection zone is commonly adopted. However, to establish the tunnel protection zone for adjacent loaded pile, the understanding on this interaction problem is essential. This study analyzes the effect of adjacent pile under loading on the existing tunnel by 3D finite element method. The case study is the tunnel of MRTA project subjected to an adjacent 1 m bored pile under loading with various lengths and clearances. The additional forces ( bending moment and axial force) and the tunnel deformations are investigated. The results show that the additional forces and the tunnel deformations decrease when the clearance increase and become insignificantly increasing when the clearance is larger than 3.5 m. The distribution patterns of additional forces and tunnel deformation are similar.

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Development of tunneling influence zones for adjacent pile foundations by numerical analyses

Cited by 89 publications

References 19 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

Investigation on pile-soil-tunnel interaction due to adjacent loaded pile row by 3D FEM

Investigation on Tunnel Responses Due to Adjacent Loaded Pile by 3d Finite Element Analysis

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