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Mathematical Problems in Engineering
Volume 2014 (2014), Article ID 540143, 6 pages
Research Article

Ultimate Capacity Analysis and Determination of the Position of Failure Surface for Uplift Piles

1School of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
2School of Civil Engineering and Architecture, Changsha University of Science & Technology, Changsha, Hunan 410076, China

Received 4 July 2013; Revised 13 February 2014; Accepted 5 March 2014; Published 7 April 2014

Academic Editor: Pedro Ribeiro

Copyright © 2014 Qian Su et al. 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.


Ultimate capacity and failure surface position of uplift piles are dependent on soil parameters. In this paper, the horizontal slice method is used to discuss the relation among the ultimate uplift capacity, the failure surface position, and soil parameters with Mohr-Coulomb failure criterion. According to the limit equilibrium analysis, the ultimate uplift capacity is calculated by dividing soil around the pile into slices with considering the potential failure surface as a group of several sectional planes. Then the multivariate function used to calculate ultimate capacity is established and optimized by the sequential quadratic programming. Through the numerical calculation and comparison with the previous research, the results show that the method is reasonable and effective and can be used to determine the failure surface and the magnitude of the ultimate capacity of uplift piles.