Modeling small-strain behavior of Taipei clays for finite element analysis of braced excavations

作者：Kung Gordon Tung Chin^*; Ou Chang Yu; Juang C Hsein

来源：Computers and Geotechnics, 2009, 36(1-2): 304-319.

DOI：10.1016/j.compgeo.2008.01.007

• Finite element method
• Braced excavation
• Wall deflection
• Ground settlement
• Soil model
• Case history

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.

• 出版日期2009-3
• 单位中央民族大学