Recently, most of deep excavation cases in Taipei were practically analyzed by adopting commercial software called FLAC that was based on finite different method. In order to explore the feasibility of using new analytical software called PLAXIS and also to verify its accuracy, this study used PLAXIS to analyze two deep excavation cases located in Taipei.
To employ advanced soil models that are not available in PLAXIS, user-defined models were developed. The advanced models included hyperbolic model that was developed by Duncan and Chang (1970), and pseudo plasticity model, modified pseudo plasticity that were proposed by doctoral students of NTUST-Taiwan Tech. The validations of the user defined models were performed by utilizing the experimental results of former studies. An excavation case named TNEC was then analyzed to examine the applicability of those soil models in the excavation analysis. Moreover, in order to investigate the interaction of building and a nearby excavation, this study also conducted the building modeling in the second excavation analysis. A previously proposed building simulation method was investigated. More relative factors such as the stiffness and the weight of the building were added to the original approach to investigate the simulation method. Furthermore, in this study, the effect of building location on the behavior of the retaining wall and ground movement was finally examined.
The analytical results exhibited that the user defined soil models incorporated in PLAXIS by this study were reasonable and applicable for the numerical analysis including experimental and excavation simulation. In addition, numerical results indicated that to obtain reasonable prediction of ground settlement, the weight of the building should be taken into account and the stiffness need to be reinvestigated.

Recently, most of deep excavation cases in Taipei were practically analyzed by adopting commercial software called FLAC that was based on finite different method. In order to explore the feasibility of using new analytical software called PLAXIS and also to verify its accuracy, this study used PLAXIS to analyze two deep excavation cases located in Taipei.
To employ advanced soil models that are not available in PLAXIS, user-defined models were developed. The advanced models included hyperbolic model that was developed by Duncan and Chang (1970), and pseudo plasticity model, modified pseudo plasticity that were proposed by doctoral students of NTUST-Taiwan Tech. The validations of the user defined models were performed by utilizing the experimental results of former studies. An excavation case named TNEC was then analyzed to examine the applicability of those soil models in the excavation analysis. Moreover, in order to investigate the interaction of building and a nearby excavation, this study also conducted the building modeling in the second excavation analysis. A previously proposed building simulation method was investigated. More relative factors such as the stiffness and the weight of the building were added to the original approach to investigate the simulation method. Furthermore, in this study, the effect of building location on the behavior of the retaining wall and ground movement was finally examined.
The analytical results exhibited that the user defined soil models incorporated in PLAXIS by this study were reasonable and applicable for the numerical analysis including experimental and excavation simulation. In addition, numerical results indicated that to obtain reasonable prediction of ground settlement, the weight of the building should be taken into account and the stiffness need to be reinvestigated.

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PLAXIS 2D Version 8 manual
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