Predicting consolidation coefficient of soft clay by time-displacement-velocity methods
- Publication Type:
- Conference Proceeding
- Citation:
- 16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2019, 2020
- Issue Date:
- 2020-01-01
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The coefficient of consolidation is a parameter, governing the rate at which saturated clay undergoes consolidation when subjected to an increase in pressure. The rate and amount of compression in clay varies with the rate that excess pore water pressure is dissipated; and hence depends on clay permeability. Over many years, various methods have been proposed to determine the coefficient of consolidation, c , which is an indication of the rate of foundation settlement on soft ground. However, defining this parameter is often problematic and greatly relies on graphical techniques, which are subject to some uncertainties. This paper initially presents an overview of many well-established methods to determine the vertical coefficient of consolidation from the incremental loading consolidation tests. An array of consolidation tests was conducted on fully-saturated and undisturbed clay samples retrieved by an oil-operated sampler, collected at various depths from a site in Nakdong river delta, Busan, South Korea. The test results on these soft sensitive clay samples were employed to predict the settlement rate of Busan clay. To establish the relationship of time-displacement-velocity, a total of 3 method groups from 10 common procedures were classified and compared together. Detailed discussion on the results of this study is also provided. v
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