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How Small Strain Stiffness and Yield Surface Affect Undrained Excavation Predictions

Lin, Horn-Da

AbstractThis paper discusses how small-strain stiffness and some aspects of the yield surface affect the finite-element predictions of excavation responses, including wall and ground deformations. By using the in-house-developed constitutive model SC1SS, it is possible to isolate and quantify impacts brought about by selected aspects of the soil behavior. This soil model has been validated to reasonably model Taipei silty clay and deep excavations in such soil. This study shows that ignoring small-strain stiffness can overestimate deformations by as much as 80%, leading to conservative and costly design. Inclined yield surface and Lode-angle dependency (on deviatoric planes) have lesser effects on the prediction results. In addition, the mechanisms behind these impacts are investigated through numerical triaxial tests.

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How Small Strain Stiffness and Yield Surface Affect Undrained Excavation Predictions

Lin, Horn-Da

AbstractThis paper discusses how small-strain stiffness and some aspects of the yield surface affect the finite-element predictions of excavation responses, including wall and ground deformations. By using the in-house-developed constitutive model SC1SS, it is possible to isolate and quantify impacts brought about by selected aspects of the soil behavior. This soil model has been validated to reasonably model Taipei silty clay and deep excavations in such soil. This study shows that ignoring small-strain stiffness can overestimate deformations by as much as 80%, leading to conservative and costly design. Inclined yield surface and Lode-angle dependency (on deviatoric planes) have lesser effects on the prediction results. In addition, the mechanisms behind these impacts are investigated through numerical triaxial tests.

How Small Strain Stiffness and Yield Surface Affect Undrained Excavation Predictions

Lin, Horn-Da

AbstractThis paper discusses how small-strain stiffness and some aspects of the yield surface affect the finite-element predictions of excavation responses, including wall and ground deformations. By using the in-house-developed constitutive model SC1SS, it is possible to isolate and quantify impacts brought about by selected aspects of the soil behavior. This soil model has been validated to reasonably model Taipei silty clay and deep excavations in such soil. This study shows that ignoring small-strain stiffness can overestimate deformations by as much as 80%, leading to conservative and costly design. Inclined yield surface and Lode-angle dependency (on deviatoric planes) have lesser effects on the prediction results. In addition, the mechanisms behind these impacts are investigated through numerical triaxial tests.

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Title:

How Small Strain Stiffness and Yield Surface Affect Undrained Excavation Predictions

Contributors:

Lin, Horn-Da (author) / Hsieh, Yo-Ming / Dang, Phuoc H

Published in:

International journal of geomechanics

Publication date:

2016

ISSN:

DOI:

https://doi.org/10.1061/(ASCE)GM.1943-5622.0000753

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Geomechanik , Zeitschrift

Classification:

BKL: 38.58 Geomechanik / 56.20 Ingenieurgeologie, Bodenmechanik / 56.20 / 38.58

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