CONSOLIDATION INDUCED NEGATIVE SKIN FRICTION ON PILES IN LAYERED SOILS.

Abstract

The problem is decomposed into three systems, namely, a saturated upper soil layer settling under a uniform surcharge in accordance with Terzaghi's one-dimensional consolidation theory, extended elastic soil layers characterized by the elastic properties of the layered soils, and a frictious pile characterized by Young's moduli equal to the difference between the Young's modulus of the real pile and the respective Young's moduli of the layered soils. The real pile force is obtained by combining the fictitious pile force with the areal integration of the effective vertical normal stress in the layered soils due to consolidation and the vertical normal stress in the extended elastic layered soils at the original pile position.