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Author: search.filters.author.Lueprasert, PrateepSubject: search.filters.subject.Finite element method

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    Structural Responses of a Tunnel Lining Due to an Adjacent Loaded Pile
    (2023-06-01)
    Lueprasert, Prateep
    ;
    Jongpradist, Pornkasem
    ;
    Jongpradist, Pattaramon
    ;
    Schweiger, Helmut F.
    The work reported in this article numerically investigates the structural forces in a tunnel lining after applying an adjacent loaded pile for varying pile tip positions considering the tunnel and soil stratum. Analysis reveals that the structural responses are strongly associated with the distorted elliptical shape of the deformed tunnel, which depends on the relative position of the pile tip with respect to the tunnel crown. The change in bending moment in the tunnel lining is of greater concern than the change in the axial force of the tunnel lining. Although the maximum change in structural forces can be up to 115% of the initial value, assessment in terms of maximum change in the structural forces is unsuitable. This is because the maximum change does not occur at the location that has large initial forces. The total combined bending moment and axial force in the lining at the tunnel spring line and in the tunnel invert zone are recommended for cases where the pile tip level is at the tunnel spring line and cases with the deepest possible pile tip elevation, respectively, for the assessment.
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    Numerical investigation of tunnel deformation due to adjacent loaded pile and pile-soil-tunnel interaction
    (2017-11-01)
    Lueprasert, Prateep
    ;
    Jongpradist, Pornkasem
    ;
    Jongpradist, Pattaramon
    ;
    Suwansawat, Suchatvee
    An adjacent construction with a pile foundation in dense urban areas can contribute to possible damage to or an operational safety concern for existing tunnels. To establish a preventive measure in the design stage, a proper assessment method for the impacts of an adjacent pile under loading on a tunnel and an understanding of pile-soil-tunnel interaction are essential. This article recommends an assessment method for tunnel deformation, defined by the maximum extension and maximum contraction of the tunnel diameter and their associated axes with respect to the horizontal and vertical directions, respectively. The method could appropriately trace the changes to the tunnel diameter and the global distortion of the tunnel lining. Using a series of three-dimensional elasto-plastic numerical analyses conducted to investigate the influences of an adjacent loaded pile on an existing tunnel for varying pile tip positions with respect to the tunnel and soil stratum, the proposed method can effectively capture the response of the deformed tunnel as a distorted ellipse shape. Investigation of the analysis results from this assessment method in conjunction with those of the supplementary analyses of pile load reasonably reveal the pile-soil-tunnel interaction mechanism behind the tunnel deformation behaviour due to an adjacent loaded pile.
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    Item type:Publication,
    Three dimensional finite element analysis for preliminary establishment of tunnel influence zone subject to pile loading
    (2015-06-28)
    Lueprasert, Prateep
    ;
    Jongpradist, Pornkasem
    ;
    Charoenpak, Kitcha
    ;
    Chaipanna, Pattanasak
    ;
    Suwansawat, Suchatvee
    Urban development often involves the construction of infrastructures that require deep foundations or piles. Due to the existence of tunnels, the need to construct deep foundations in close proximity contributes to possible damage to the tunnels and operational safety concern. The concept of influence zones has been proposed as restrictive guidelines for construction adjacent to underground tunnels. However, the current influence zones are based on the conventional assumption of soil failure due to tunnelling rather than on an understanding of the pile-tunnel interaction. This paper thus analyses the impacts of piles under loading on the subway tunnel of the Mass Rapid Transit Authority of Thailand in Bangkok using the 3D finite element method. The analyses are carried out to investigate factors in tunnel deformations. The results show that the significant factors are the relative position of the pile tip with respect to the tunnel position as well as the soil type where the tunnel is located. In addition, this paper tentatively proposes a new influence zone for pile construction adjacent to the existing tunnel.