Delayed installation of piles in consolidating soil

摘要

The current general accepted view is that the delayed installation of piles after the commencement of consolidation leads to a reduction of drag load acting on piles. Despite the extensive studies reported in the literature, no work that focussed on the quantitative effect of delayed installation of piles after the commencement of the consolidation on pile behavior was reported. A study on the effect of the delayed pile installation after the commencement of the consolidation is undertaken using a load transfer theory. Pile-soil slip is accounted for by limiting shear stress at the pile-soil interface to the average undrained shear strength of the consolidating soil. The effect of pile-soil slip in limiting the drag load is accounted for once the location of the neutral plane resulting from the delayed pile installation after the commencement of the consolidation is known. Contrary to the current generally accepted understanding that delayed installation of piles after the commencement of the consolidation will lead to a reduction of drag load on such piles, the present study finds that the drag load on piles may not be reduced for consolidating soft clay with two ways drainage or one way bottom drainage conditions. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.