Modeling small-strain behavior of Taipei clays for finite element analysis of braced excavations |
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| Authors: | Gordon Tung-Chin Kung Chang-Yu Ou C Hsein Juang |
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| Institution: | 1. Sustainable Environment Research Center, National Cheng Kung University, Tainan 701, Taiwan;2. Department of Construction Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan;3. Department of Civil Engineering, Clemson University, Clemson, SC 29634, USA;4. Chair Professor of Civil Engineering, National Central University, Junli, Taiwan |
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| Abstract: | We examine the small-strain behavior of Taipei clays in braced excavation through a detailed analysis of a well-documented case history. Specifically, we analyze the case of the Taipei National Enterprise Center (TNEC) excavation using two soil models, the Modified Cam-clay model (MCC) and the three-Surface Kinematic Hardening model (3-SKH). Our finite element analysis includes a consideration of the over-consolidated stress state and the high initial shear modulus of the clay. Results show that the observed wall deflection and surface settlement can be satisfactorily predicted simultaneously using the 3-SKH model. This is an improvement on the MCC model, for which only wall deflection, not ground settlement, can be accurately predicted. This study re-confirms the importance of considering small-strain non-linear behavior for the over-consolidated stress state in finite element analyses of braced excavation responses. |
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