| Author: | Lou, Kai |
| Title: | Computer modelling and analysis of consolidation of soils with creep in 1D and 2D conditions |
| Advisors: | Yin, Jian-hua (CEE) |
| Degree: | M.Sc. |
| Year: | 2018 |
| Subject: | Hong Kong Polytechnic University -- Dissertations Soil mechanics Soil dynamics Geotechnical engineering |
| Department: | Faculty of Construction and Environment |
| Pages: | v, 118, 11 pages : color illustrations |
| Language: | English |
| Abstract: | With the rapid development and urbanisation, the requirement of infrastructure projects becomes more and more high while appropriate ground for construction becomes increasingly meagre. To meet the increasing demand for construction, reclamation is an effective approach to solve this problem in coastal regions. However, long-term settlement is the predominant challenge for reclamation and embankment. Though researchers have achieved advances in theory of viscous behaviour of soft soils in 1-D consolidation, most geotechnical engineers still prefer conventional analysis methods without appreciating the time-dependent characteristics. One of the reasons is the difficulty and complexity of implementing creep into simple equations for hand calculation. This dissertation aims to provide a new simplified method to easily calculate the consolidation settlements, including creep deformation, under various loading conditions in both theoretical and practical fields of geotechnical projects. Based on the concept of equivalent time, Yin and Feng (2017) proposed a new simplified Hypothesis B method to calculate total settlements considering the creep effect. This new method shows a good feasibility of predicting settlement of soft soils. Nevertheless, the method focuseson the cases of single-staged loading only. In actual construction projects, loadings are not applied instantly but in a few loading stages. Therefore, this dissertation extends and derives a new simplified Hypothesis B method to calculate the consolidation of soft soils under multi-staged ramp loading and unloading. Field tests of one soil layer without and with vertical drain are employed to verify the feasibility of the new simplified method. Also, parametric studies for different multi-staged loading conditions are simulated by the finite element software PLAXIS to verify the proposed new simplified method. Especially, the unloading cases are considered and discussed. It is found that the settlements of soil layers with and without PVDs are satisfactorily predicted by the new simplified method. |
| Rights: | All rights reserved |
| Access: | restricted access |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| 991022244147903411.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 7.56 MB | Adobe PDF | View/Open |
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