Modelling ground response for deep excavation in soft ground

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Author(s)
Yong, Choo C
Oh, Erwin
Griffith University Author(s)
Year published
2016
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Due to its simplicity in use and input parameters can be straightforwardly determined (from
in-situ tests, laboratory tests and empirical correlations), linear elastic perfectly-plastic Mohr-Coulomb (MC)
model remains a favourite constitutive modelling choice to Geotechnical engineers. Non-linear Hardening
Soil (HS) model is an improvement of MC model. It is not commonly used mainly due to lack of appropriate
non-linear drained stiffness parameters from laboratory tests and field calibrations. Using a deep excavation
project as a case study, this paper presents a comparison of MC and HS models in assessing wall deflection.
The ...
View more >Due to its simplicity in use and input parameters can be straightforwardly determined (from in-situ tests, laboratory tests and empirical correlations), linear elastic perfectly-plastic Mohr-Coulomb (MC) model remains a favourite constitutive modelling choice to Geotechnical engineers. Non-linear Hardening Soil (HS) model is an improvement of MC model. It is not commonly used mainly due to lack of appropriate non-linear drained stiffness parameters from laboratory tests and field calibrations. Using a deep excavation project as a case study, this paper presents a comparison of MC and HS models in assessing wall deflection. The numerical models are established based on soil parameters interpreted from available soil investigation. It was found from back analysis of a case history that laboratory tests and empirical correlations grossly underestimated the drained stiffness parameters. In order to close the gaps between predicted and observed deflections, the drained stiffness parameters have to be increased by six-fold and more than eight-fold for MC Model and HS Model, respectively.
View less >
View more >Due to its simplicity in use and input parameters can be straightforwardly determined (from in-situ tests, laboratory tests and empirical correlations), linear elastic perfectly-plastic Mohr-Coulomb (MC) model remains a favourite constitutive modelling choice to Geotechnical engineers. Non-linear Hardening Soil (HS) model is an improvement of MC model. It is not commonly used mainly due to lack of appropriate non-linear drained stiffness parameters from laboratory tests and field calibrations. Using a deep excavation project as a case study, this paper presents a comparison of MC and HS models in assessing wall deflection. The numerical models are established based on soil parameters interpreted from available soil investigation. It was found from back analysis of a case history that laboratory tests and empirical correlations grossly underestimated the drained stiffness parameters. In order to close the gaps between predicted and observed deflections, the drained stiffness parameters have to be increased by six-fold and more than eight-fold for MC Model and HS Model, respectively.
View less >
Journal Title
International Journal of GEOMATE
Volume
11
Issue
26
Publisher URI
Copyright Statement
© 2016 GEOMATE International Society. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Subject
Civil engineering
Civil geotechnical engineering