Optimization Strategy of the Long-Short-Pile Composite Foundation Based on the Settlement Control

Abstract:

By using finite difference software FLAC3D, the displacement field and stress field of the long-short-pile composite foundation were studied, as well as the distribution of axial force, neutral position and penetration amount. The effects of the main parameters of long-short-pile composite foundation on its working properties, such as the modulus and thickness of the cushion, the length and quantity of the long pile, are investigated in detail. The results show that the modulus and thickness of cushion have less effect on the foundation settlement, while they can affect the pile-soil stress ratio significantly. Moreover, increasing the number of piles can control the foundation settlement effectively. The stresses in upper soil layer can be transferred to lower soil layer effectively, with the increasing of the number of long piles. Then the foundation settlement can be reduced correspondingly. While the variation of the number of piles has less effect on the stress field when the number of piles reaches a certain extend, and the reduction of the foundation settlement tends to slow down. Further, the foundation settlement decreases with the increasing of long-pile length. Finally, based on the foundation settlement control, the recommended values of parameters are given.

• Periodical: Advanced Materials Research (Volumes 243-249)
• Pages: 2429-2434
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.243-249.2429
• Online since: May 2011
• Authors: Yuan Cheng Guo, Si Hua Zhang, Gang Shi, Ning Liu
• Keywords: Long-Short-Pile Composite Foundation, Numerical Simulation, Optimization Strategy, Settlement Control

References

[1] Fenyong Liu, Xiaobin Yan, Xue Liu. Field test of a composite foundation including mixed pile. Chinese Journal of Geotechnical Engineering Vol.25(1)(2003), pp.71-75 (in Chinese)

[2] Dequan Zhou, Keneng Zhang, Hongli Liu. Application and calculation analysis of combined pile composite foundation. Rock and Soil Mechanics Vol. 25(9) (2004), pp.1432-1436(in Chinese)

[3] Longzhu Chen, Fayun Liang, Ping Yan. Experimental study of behavior of rigid-flexible pile raft foundation with cushion. Journal of Building Structure Vol. 25(3) (2004), pp.125-129(in Chinese)

[4] Haitao Liu, Yuxin Xie, Gong Cheng, et.al. Experimental study of the rigid·flexible pile composite foundation. Rock and Soil Mechanics Vol. 26(2) (2005), pp.303-306(in Chinese)

[5] Code for design of building foundation Chinese National code(2002)

[6] Hossein T, Kazuo K. Numerical analysis of nonlineat soil-pile group interaction under lateral loads. Soil Dynamics and Earthquake Engineering Vol.27 (5)(2007), pp.1-12

DOI: 10.1016/j.soildyn.2006.09.005