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Behaviour of a Single Pile in Heaving Ground Due to Ground Excavation  

Lee, Cheolju (강원대학교 토목공학과)
Publication Information
Journal of the Korean GEO-environmental Society / v.11, no.1, 2010 , pp. 27-34 More about this Journal
Abstract
A finite element analysis has been conducted to clarify the behaviour of a single pile in heaving ground related to ground excavation. The numerical analysis has included soil slip at the pile-soil interface, analysing the interaction between the pile and the clay has been studied. The study includes the upward movement of the pile, the relative shear displacement between the pile and the soil and the shear stresses at the interface and the axial force on the pile. In particular, the shear stress transfer mechanism at the pile-soil interface related to a decrease in the vertical soil stress has been rigorously analysed. Due to the reductions in the vertical soil stress after excavation, the relative shear displacement and the shear stress along the pile have been changed. Upward shear stress developed at most part of the pile (Z/L=0.0-0.8), while downward shear stress is mobilized near the pile tip (Z/L=0.8-1.0) resulting in tensile force on the pile, where Z is the pile location and L is the pile length. Some insights into the pile behaviour in heaving ground analysed from the numerical analyses has been reported.
Keywords
Numerical modelling and analysis; Piles; Soil slip; Soil-structure interaction; Heaving ground;
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