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Excess Pore Water Pressure Response in Soft Clay under Embankment  

Kim, Yun-Tae (Member, Senior Manager, LG Engrg. and Construction Corp.)
Kim, Nak-Kyung (Member, Assistant Professor, Dept. of Civil Engrg., Sungkyunkwan Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.18, no.3, 2002 , pp. 105-112 More about this Journal
Abstract
Increases in excess pore water pressure without change of surcharge load were reported in clay underneath embankment at Berthierville and Olga sites after the end of construction. These abnormal phenomena could not be explained by classical consolidation theory. This paper presents a nonlinear viscoplastic model to interpret an increase in pore water pressure on natural clay, The proposed model can consider the combined processes of pore water pressure dissipation according to Darcy's law and pore water pressure generation due to viscoplastic strain, as well as time-dependent viscoplastic behaviour and strain rate dependency of preconsolidation pressure. The calculated results using numerical analysis are compared with measured ones under embankments built on soft clay at Berthierville and Olga in Quebec, Canada. It may be possible to explain the phenomenon of excess pore water pressure increase after the end of construction using the proposed nonlinear viscoplastic model.
Keywords
Embankment; Excess pore water pressure; Viscoplastic behavior;
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