Abstract
An experimental investigation was carried out on the reconstituted Tunis soft soil that was extracted from the center of Tunis City at 35 m depth. A specific laboratory test apparatus was designed and manufactured to perform three consolidation series of tests by applying a negative pressure, a preload or a vacuum pressure combined with preload. Excess pore pressure and settlement were measured during the consolidation process. Experimental results showed that for the same magnitude of preload and the vacuum pressure of 4 kPa, 8 kPa and 16 kPa and 30 kPa, the settlement caused by the vacuum pressure is lower than that generated by the preload. While the settlement generated by preloads of 60 kPa and 100 kPa are slightly smaller than those caused by the vacuum consolidation of 60 kPa and 100 kPa. Recorded excess pore pressure around the geodrain dissipated more quickly compared to excess pore pressure close to cell border. The normalized excess pore pressure for preload decreases when the applied preload increases and then increases quasi-linearly with the increase of horizontal distance between transducers to geodrain. While, the normalized excess pore pressure for vacuum pressure increases with the increase of the applied negative pressure and decreases with the increase of horizontal distance between transducers and the geodrain.
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Jebali, H., Frikha, W., Bouassida, M. (2018). Application of Vacuum Consolidation for the Improvement of Tunis Soft Soil. In: Bouassida, M., Meguid, M. (eds) Ground Improvement and Earth Structures. GeoMEast 2017. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-319-63889-8_8
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DOI: https://doi.org/10.1007/978-3-319-63889-8_8
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