Study on Dynamic Resilient Modulus Prediction of Subgrade Soil and Its Relevant Finite Element Method Implementation

DOI

10.2991/iceesd-18.2018.144How to use a DOI?

Keywords

dynamic resilient modulus；soil-water characteristic curve；triaxial test; consistent tangent stiffness matrix; finite element method

Abstract

In order to investigate the effect of moisture content on cohesive subgrade soils dynamic resilient modulus, a series of dynamic-triaxial test were carried out. Based on the matric suctions measured by the filter paper method, the relationship between dynamic resilient modulus and matric suctions were analyzed. The study demonstrated that the dynamic resilient modulus values decrease with the increase of circular deviator stress and moisture content, in reverse of matric suctions. Considering that the dynamic resilient modulus is a function of deviator stress and bulk stress, based on the present three parameters compound constitutive model which reflects the effect of bulk stress and deviator stress, the effect of matric suctions which could indirectly reflect the effect of moisture content was introduced. And then the prediction model incorporating the effect of stress and moisture for cohesive subgrade soils was established. The model was utilized for experimental data regression analysis, a high coefficient of determination shows that the model is accurate and credible. Based on available model, an improved resilient modulus prediction model considering four parameters was proposed by introducing matric suction. Corresponding accurate consistent tangent stiffness matrix was derived. Afterward, the improved model was implemented into finite element method software and verification work was put forward.The prediction models not only can evaluate the long-term performance of subgrade soil in Southern China's rainy areas, but also can provide parameters for the pavement design based on dynamic method.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Cheng Dong
AU  - Wenjie Liu
AU  - Lun Zhou
AU  - Ruilei Zhang
PY  - 2018/05
DA  - 2018/05
TI  - Study on Dynamic Resilient Modulus Prediction of Subgrade Soil and Its Relevant Finite Element Method Implementation
BT  - Proceedings of the 2018 7th International Conference on Energy, Environment and Sustainable Development (ICEESD 2018)
PB  - Atlantis Press
SP  - 784
EP  - 789
SN  - 2352-5401
UR  - https://doi.org/10.2991/iceesd-18.2018.144
DO  - 10.2991/iceesd-18.2018.144
ID  - Dong2018/05
ER  -