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Advances in Materials Science and Engineering
Volume 2014 (2014), Article ID 745386, 7 pages
http://dx.doi.org/10.1155/2014/745386
Research Article

Dynamic Characteristics of Saturated Silty Soil Ground Treated by Stone Column Composite Foundation

1Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
2State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
3School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

Received 10 January 2014; Accepted 22 April 2014; Published 19 May 2014

Academic Editor: Mohd Sapuan Salit

Copyright © 2014 Yongxiang Zhan 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.

Abstract

A shaking table model test was carried out to develop an understanding of the performance improvement of saturated silty soil ground using stone column composite foundation as reinforcement. It is found that at less than 0.161 g loading acceleration, soil between piles has not yet been liquefied, the response acceleration scarcely enlarges, and the shear displacement almost does not appear in silty soil. At 0.252 g loading acceleration, as a result of liquefaction of soil between piles, the response acceleration increases rapidly and reaches its peak, and the shear displacement of silty soil increases significantly. At 0.325 g loading acceleration, the integral rigidity of foundation decreases greatly, which reduces its capability of vibration transmission and result in the response acceleration amplification coefficient is less than that at the former loading acceleration, but the shear displacement of silty soil further increases. The stone column composite foundation can greatly reduce both the shear displacement and the settlement of ground compared with untreated foundation. Under the condition of 7-degree seismic fortification, the design meets seismic resistance requirements.