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|Model tests of soil heave plug formation in suction caisson
|Cofferdams & Caissons
Anchors & Anchorages
|Guo, W., Chu, J., & Kou, H. (2016). Model tests of soil heave plug formation in suction caisson. Proceedings of the Institution of Civil Engineers - Geotechnical Engineering, 169(2), 214-223. doi:10.1680/jgeen.15.00032
|Proceedings of the Institution of Civil Engineers - Geotechnical Engineering
|An experimental study of the formation of the soil heave plug inside a concrete caisson during installation in clay under suction is presented. The soil heave plug, the amount of caisson penetration and the vacuum pressure applied were measured during the model tests. The results show that the soil heave plug can completely fill in the cavity and prevent the caisson from penetrating further. The soil heave plug is affected by the geometry of the caisson. The higher the consolidation stress or the stiffer the soils, the higher is the suction pressure required, and a higher suction will in turn induce a greater soil heave plug. The m value, defined as the ratio of the volume of the soil heave plug to that of the penetrated caisson skirt wall, is adopted to evaluate the soil heave plug. The relationship between the m value and the undrained shear strength of the soil can be used to estimate the amount of soil heave plug and the caisson penetration for a concrete caisson with a wall thickness to external diameter ratio of 5% in normally consolidated clay conditions.
|School of Civil and Environmental Engineering
|© 2016 ICE Publishing. This paper was published in Proceedings of the Institution of Civil Engineers - Geotechnical Engineering and is made available as an electronic reprint (preprint) with permission of ICE Publishing. The published version is available at: [http://dx.doi.org/10.1680/jgeen.15.00032]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
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