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http://dx.doi.org/10.7843/kgs.2017.33.11.45

Numerical Analysis on Consolidation of Soft Clay by Sand Drain with Heat Injection  

Koy, Channarith (Dept. of Civil Engrg., Gangneung-Wonju National Univ.)
Yune, Chan-Young (Dept. of Civil Engrg., Gangneung-Wonju National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.33, no.11, 2017 , pp. 45-57 More about this Journal
Abstract
Temperature change affects consolidation behavior of soft clays. The increase of temperature in soft clays induces the increase of pore water pressure. The dissipation of the excess pore water pressure decreases volume and void ratio. Also, the consolidation rate is accelerated by high temperature which induces the decrease of viscosity of pore fluid. The effects of temperature on the consolidation behavior such as consolidation settlement, consolidation time, and pore water pressure were investigated in this study. A numerical analysis of hydro-mechanical (HM) and thermo-hydro-mechanical (THM) behavior was performed. The combination of heat injection and sand drain for consolidating the soft ground, with varying temperature (40 and $60^{\circ}C$) and sand drain diameter (40, 60, and 80 mm), was considered. The results show that the temperature inside soil specimen increases with the increase of the temperature of heating source and the diameter of sand drain. Moreover, the heat injection increases the excess pore water pressure and, accordingly, induces additional settlement in overconsolidated (OC) state and reduces the consolidation time in normally consolidated (NC) state.
Keywords
Consolidation; Numerical analysis; Thermo-hydro-mechanical; Heat injection; Sand drain;
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