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Subject: search.filters.subject.Shield tunneling method

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    Simulation on small diameter shield for pre-support method by numerical analysis
    (2020-01-01)
    Sugimoto, Mitsutaka
    ;
    Huynh, T. N.
    ;
    Chaiyaput, S.
    ;
    Lam, L. G.
    ;
    Miki, A.
    When the road shield tunnels are constructed in urban area, the construction of branch tunnels from a main road tunnel by non-open cut method is required. Therefore, a pre-support method using several small diameter shield tunnels above and below the main shield tunnel was proposed for soft ground under groundwater level. But the small diameter shield tunnel with three dimensional sharp curve has never been constructed before, since it is difficult to control the shield along the planned alignment. Therefore, the shield operation parameters were estimated theoretically and the shield behaviors were simulated to examine the possibility of the shield tunnels using a small diameter shield with 3D sharp curve. As a result, it was confirmed that the calculated shield behavior has a good agreement with the planned one, by adjusting the shield operational parameters.
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    Study on shield operation method in soft ground by shield simulation
    (2018-06-01)
    Sugimoto, Mitsutaka
    ;
    Tanaka, Hideyuki
    ;
    Huynh, Ngoc Thi
    ;
    Chaiyaput, Salisa
    ;
    Lam, Le Gia
    Shield tunneling technologies have been developed for constructing tunnels in soft ground especially under groundwater. Recently, challenging projects from the viewpoint of tunneling technology have been planned. To realize these constructions, it is necessary to examine the shield operation method preliminarily. The authors have developed a method to carry out the above examination and have confirmed its validity for a tunnel in stiff ground. In this research, to examine the performance of the proposed method for soft ground tunnel, the simulation on shield behavior was carried out using the estimated shield operational data for a tunnel in soft ground. As a result, the following were found: the shield steering conditions by the proposed method are not enough to rotate the shield along a sharp curve in case of soft soil; and the simulation results have a good agreement with the planned alignment using proper shield operational data.