Numerical study of creep effects on settlements and load transfer mechanisms of soft soil improved by deep cement mixed soil columns under embankment load |
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| Affiliation: | 1. Civil Engineering Department, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand;2. Institute of Soil Mechanics, Foundation Engineering and Computational Geotechnics, Graz University of Technology, Graz, Austria;1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, and Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, China;2. Department of Civil, Environmental, and Architectural Engineering, The University of Kansas, Lawrence, KS, USA;1. Graduate School of Science and Technology, Saga University, Saga, Japan;2. Institute of Lowland and Marine Research, Saga University, Saga, Japan;3. Tongji University, Shanghai, China;4. JIP Techno Science Corporation, Tokyo, Japan;5. Faculty of Engineering and Built Environment, The University of Newcastle, NSW 2308, Australia;1. Key Laboratory of High-Speed Railway Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, China;2. School of Civil Engineering, Southwest Jiaotong University, China;3. GeoEngineering Centre at Queen''s-RMC, Queen''s University, Kingston, Ontario, K7L 3N6, Canada;4. Department of Civil Engineering, Queen''s University, Canada |
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| Abstract: | Deep cement mixed (DCM) soil columns have been widely utilized to improve soft soil to support embankments or seawalls. However, the influence of the time-dependent behavior of the soft soil on the performance of DCM column-supported embankments is not well understood. In this study, the finite element (FE) model was established to investigate the creep effects on settlements and load transfer mechanisms of the soft soil improved by DCM columns under embankment load. Comparisons were conducted for the cases of the soft soil with or without creep. The parametric analysis demonstrated that the area replacement ratio and Young's modulus of the DCM column can largely influence the long-term behaviors of the DCM column-improved composite ground. The numerical results were also compared with the results calculated by German design method (EBGEO) and British design method (BS 8006). Regarding the vertical stress taken by the DCM column, EBGEO method provides a lower limit while BS 8006 method provides an upper limit. |
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| Keywords: | Geosynthetics Column-supported embankment Deep cement mixed soil column Creep Settlements Load transfer |
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