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Advances in Civil Engineering
Volume 2012, Article ID 749540, 9 pages
http://dx.doi.org/10.1155/2012/749540
Research Article

Analytical Model for the End-Bearing Capacity of Tapered Piles Using Cavity Expansion Theory

Department of Civil Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan

Received 2 May 2012; Revised 21 September 2012; Accepted 5 October 2012

Academic Editor: John Mander

Copyright © 2012 Suman Manandhar and Noriyuki Yasufuku. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

On the basis of evidence from model tests on increasing the end-bearing behavior of tapered piles at the load-settlement curve, this paper proposes an analytical spherical cavity expansion theory to evaluate the end-bearing capacity. The angle of tapering is inserted in the proposed model to evaluate the end-bearing capacity. The test results of the proposed model in different types of sands and different relative densities show good effects compared to conventional straight piles. The end-bearing capacity increases with increases in the tapering angle. The paper then propounds a model for prototypes and real-type pile tests which predicts and validates to evaluate the end-bearing capacity.