A comparative study of ordinary piles and superlong piles in consolidating soil

Abstract

This paper presents finite element analyses of negative skin friction on a short single pile, long pile and superlong pile under various conditions. Negative skin friction is a most common problem in designed and construction of pile in a highly compressible soft soil. In this paper, a 3D-dimensional axisymmetric model is built in the finite element program, ABAQUS6.14. The model first is verified with a centrifuge test results. The study concluded that the neutral plane is located closer to the end of the pile as the end bearing increases. Based on the analyses, it is found that the location of the neutral plane is significantly influenced by the pile tip location from bearing layer. the normalized neutral plane decreases with the increase of the pile length embedded in the clay layer. Closed form equations of Shong, 2002, predict the numerical results in well agreement.