Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/52718
Title: Evaluation of soil constitutive model on braced excavation support behaviour
Authors: Sim, Zhi Hui.
Keywords: DRNTU::Engineering::Civil engineering::Geotechnical
Issue Date: 2013
Abstract: For this project, a two dimensional finite element analysis using PLAXIS was conducted to evaluate the performances of two types of soil stress-strain model, namely, Mohr-Coulomb model and the Hardening Soil model for excavations in clay. The results from these two models were compared in regards to the best fit E_u/C_u ratio, maximum wall deflection, ground settlement and strut forces. The best fit E_u/C_u ratio was plotted against various parameters such as Plasticity Index (PI), Undrained Shear Strength (Cu), Factor of Safety (Fs) as well as (Cu/(σ_v^' )) to obtain correlations. A total of seven case studies with complete soil data were used for analysis. In order to obtain the best fit E_u/C_u ratio for both the Mohr-Coulomb model and the Hardening Soil model, models were created by varying the Eu values from the available Cu data. The best fit E_u/C_u ratio model would have the one with the closest fit with the actual measured wall deflection. The results show that using the Mohr-Coulomb model for excavation analysis in clay tend to produce higher values for the best fit E_u/C_u ratio. Also, using the Mohr-Coulomb model tends to produce smaller initial settlement but larger final settlement. In addition, using the Mohr-Coulomb model tends to produce 10~30% more strut forces than using the Hardening Soil model. Lastly, there is a downward sloping trend when the best fit E_u/C_u ratio is plotted against (Cu/(σ_v^' )).
URI: http://hdl.handle.net/10356/52718
Schools: School of Civil and Environmental Engineering 
Rights: Nanyang Technological University
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:CEE Student Reports (FYP/IA/PA/PI)

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