Analysis of Interaction of Single Pile-soil-cap in Layered Foundationunder Cyclic Loading

YAN Min; LI Bo; LI Wei

doi:10.11988/ckyyb.20140541

PDF(1389 KB)

Journal of Changjiang River Scientific Research Institute ›› 2015, Vol. 32 ›› Issue (12) : 76-81. DOI: 10.11988/ckyyb.20140541

ＲＯＣＫＳＯＩＬＥＮＧＩＮＥＥＲＩＮＧ

Analysis of Interaction of Single Pile-soil-cap in Layered Foundationunder Cyclic Loading

YAN Min¹, LI Bo¹, LI Wei^2,3

Author information +

History +

Abstract

A simplified analytical approach was proposed to study on the interaction of single pile-soil-cap (SPSC)under cyclic loading in layered soils, combined with the theory of Mindlin plate theory and elastic foundation model, as well as the law of load transfer of single pile. At first, we established the stiffness matrixes for interaction of SPSC and predicted the accumulative settlement of the single pile with cap and variation of SPSC global stiffness through employing attenuation of compressive modulus. Then, on the basis of this, we carried out cases verification and parameters analysis. The results show that, calculated data by the method in this paper is well consistent with those by Butterfield method; furthermore, the global stiffness of the SPSC is significantly greater than that of the single pile because of the addition of the pile cap, and the increase of elastic modulus of the pile can obviously strengthen the global stiffness; meanwhile, there exists an optimum value range of the length of a pile for a given diameter, and the increase of the length of pile has less influence on the global stiffness of the SPSC and the bearing load ratio of the cap when the ratio of length to diameter of pile is larger than a determined value; finally, the global stiffness of the SPSC gradually increased with the cyclic count until the stiffness is up to a stable value.

Key words

single pile-soil-cap / cyclic loading / foundation of layered soils / global stiffness / Mindlin plate theory

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

YAN Min, LI Bo, LI Wei. Analysis of Interaction of Single Pile-soil-cap in Layered Foundationunder Cyclic Loading[J]. Journal of Changjiang River Scientific Research Institute. 2015, 32(12): 76-81 https://doi.org/10.11988/ckyyb.20140541

References

[1] MAGNAN J P. Methods to Reduce the Settlement of Embankments on Soft Clay: A Review[C]∥The Geotechnical Engineering Division of the American Society of Civil Engineers. Proceedings of Vertical-Horizontal Deformations of Foundations and Embankments, College Station, Texas, United States, June 16-18, 1994:77-91.
[2] 董建国,赵锡宏.高层建筑地基基础[M].上海: 同济大学出版社, 1996.(DONG Jian-guo, ZHAO Xi-hong. Foundation Design of High-rise Buildings[M]. Shanghai: Tongji University Press, 1996. (in Chinese))
[3] TA L D, SMALL J C. An Approximation for Analysis of Raft and Piled Raft Foundations[J]. Computers and Geotechnics, 1996,20(2): 105-123.
[4] JONES C J F P, LAWSON C R, AYRES D J. Geotextiles Reinforced Piled Embankments[C]∥HOEDT G D. Proceedings of the 4th International Conference on Geotextiles, Geomembranes and Related Products(Vol.2), Balkema, Rotterdam, the Netherlands, May 28-June 1,1990: 155-160.
[5] WOOD H J.The Design and Construction of Pile-supported Embankments for the A63 Selby Bypass[C]∥NEWSON T A.Proceedings of BGA International Conference on Foundations:Innovations,Observations,Design and Practice,Dundee,Scotland,September 2-5,2003:941-950.
[6] LIU H L, CHARLES W W, FEI K. Performance of A Geogrid-reinforced and Pile-supported Highway Embankment over Soft Clay: Case Study[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2007,133(12):1 483-1 493.
[7] 蔡德钩,叶阳升,闫宏业,等.桩网支撑路基力学性能数值分析[J]. 中国铁道科学, 2010,31(3):1-8.(CAI De-gou, YE Yang-sheng, YAN Hong-ye, et al. Numerical Analysis on the Mechanical Properties of Geosynthetic Reinforced and Pile Supported Embankment[J]. China Railway Science, 2010,31(3):1-8. (in Chinese))
[8] 丁铭绩.高速铁路CFG桩桩板复合地基工后沉降数值模拟[J]. 中国铁道科学, 2010,29(3): 1- 6.(DING Ming-ji. Numerical Simulation on the Post-construction Settlement of CFG Pile-slab Composite Foundation in High-speed Railway[J]. China Railway Science, 2010,29(3):1-6. (in Chinese))
[9] PINTO A, FALCAO J, PINTO F, et al. Ground Improvement Solutions Using Jet Grouting Columns[C]∥International Society for Soil Mechanics and Geotechnical Engineering. Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering. Osaka, Japan, September 12-15, 2005: 1249-1252.
[10]POULOS H G. Settlement of Single Pile in Non Homogenous Soil[J]. Journal of Geotechnical Engineering Division of ASCE, 1979, 105(5): 627-642.
[11]王旭东, 刘宇翼, 宰金珉, 等. 广义Gibson地基中单桩-土-承台共同作用简化分析[J]. 岩土工程学报, 2008,30(7):953-958.(WANG Xue-dong, LIU Yu-yi, ZAI Jin-min, et al. Simplified Analysis for Interaction of Single Pile-soil-cap in Generalized Gibson Soil[J]. Chinese Journal of Geotechnical Engineering, 2008,30(7):953-958. (in Chinese))
[12]HAN J, GABR M. Numerical Analysis of Geosynthetic-reinforced and Pile Supported Earth Platforms over Soft Soil[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2002,128(1):44-53.
[13]MAHARAJ D K. Load-settlement Behavior of Piled Raft Foundation by Three Dimensional Nonlinear Finite Element Analysis[J]. Electronic Journal of Geotechnical Engineering, 2003,8: Paper0334.
[14]COOKE R W, PRICE G, TARR K. Jacked Piles in London Clay: A Study of Load Transfer and Settlement under Working Conditions[J]. Geotechnique, 1979,29(2): 113-147.
[15]黄茂松, 江杰, 梁发云, 等. 层状地基中桩基础的竖向荷载位移关系非线性分析方法[J]. 岩土工程学报, 2008,30(10):1423-1429.(HUANG Mao-song, JIANG Jie, LIANG Fa-yun, et al. Nonlinear Analysis for Settlement of Vertically Loaded Pile Foundation in Layered Soils[J]. Chinese Journal of Geotechnical Engineering, 2008, 30(10):1423-1429. (in Chinese))
[16]BUTTERFIELD R, BANERJEE P K. The Elastic Analysis of Compressible Piles and Pile Groups[J]. Geotechnique, 1971, 21(1): 43-60.
[17]SEED H B, REESE L C. The Action of Soft Clay along Frictional Piles[J]. Transactions of the American Society of Civil Engineers, 1957,122(1): 731-754.
[18]江杰, 黄茂松, 李波,等.重复加卸载下桩筏基础沉降分析与离心模型试验[J]. 岩土工程学报, 2009,31(12):1811-1817.(JIANG Jie, HUANG Mao-song, LI Bo, et al. Nonlinear Analysis for Settlement of Vertically Loaded Pile Foundation in Layered Soils[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(12): 1811-1817.(in Chinese))