抄録
During installation of prefabricated piles in saturated clayey soils, excess pore water pressure is generated around the pile shaft and tip. The induced excess pore pressure is important to evaluate the stress state variations in clay and the subsequent pile bearing capacity. The main objective of this paper is to present a finite element numerical model to simulate a mini-cone installation (representing pile) and subsequent pore water pressure dissipation with time. The effect of OCR on soil stress state is also investigated. The numerical model is validated using the results of a physical model in which a mini-cone is penetrated into a consolidation chamber containing saturated clay. The results show that higher OCR develops less excess pore water pressure during installation. It is shown, however, that radial and vertical effective stresses as well as the coefficient of lateral earth pressure increase with increasing OCR during the excess pore water pressure dissipation process.
