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Author: search.filters.author.Jongpradist, PornkasemSubject: search.filters.subject.Numerical analysis

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    Dependence Of Tunnel Deformation Due To Adjacent Pile Under Loading On Tunnel Geometry
    (2019-01-01)
    Lueprasert, Prateep
    ;
    Jongpradist, Pornkasem
    ;
    Ruangvirrojanakul, Kodchamon
    ;
    Suwansawat, Suchatvee
    With rapid urbanization, large number of tunnels with various dimensions have been constructed for transportation and utility systems in many big cities. At the same time, the constructions of infrastructures using a pile foundation system are also necessary in urban area. With limited space, the existing tunnels can be inevitably impacted by the newly constructed pile-supported structures. With various design criteria of tunnel lining, the size and thickness are varied from project to project. With an adjacent pile under loading, different degrees of impact on these tunnels are expected. This study numerically investigates the effect of tunnel diameter and lining thickness on tunnel deformation due to adjacent pile under loading. The MRTA and WMA tunnels in Bangkok subsoil are chosen as the reference cases for investigation. From a series of parametric study, a relationship between the tunnel deformation and dimensionless parameter, which include the size and thickness of lining, can be successfully established.
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    Item type:Publication,
    Development of tunneling influence zones for adjacent pile foundations by numerical analyses
    (2013-02-01)
    Jongpradist, Pornkasem
    ;
    Kaewsri, Theerapong
    ;
    Sawatparnich, Attasit
    ;
    Suwansawat, Suchatvee
    ;
    Youwai, Sompote
    In this study, three-dimensional elasto-plastic numerical analyses are conducted to investigate the influences of tunnel excavation on existing loaded piles. The effects of parameters on pile responses to be used as criteria for suggesting the influence zones can be captured from the analysis method. A large number of analyses are then carried out to generate the artificial data of pile responses from tunneling for establishing the influence zones. Deep and shallow tunneling are separately considered with their influence zones are suggested from the normalized pile settlement and the induced pile bending moment, respectively. The two zones are then combined. Based on the ground condition, geometries of the pile and the tunnel, tunnel construction method, and evaluated criteria considered in this study, the unique significant zones of influence for various conditions can be identified. © 2012 Elsevier Ltd.