|Table of Contents|

Interaction of Flexible Plie-soil-cushion in Multi-element Composite Foundation(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2008年04期
Page:
36-41
Research Field:
Publishing date:
2008-12-20

Info

Title:
Interaction of Flexible Plie-soil-cushion in Multi-element Composite Foundation
Author(s):
LIU Jie;  HE Jie
Institute of Geotechnical Engineering, Hunan University of Technology, Zhuzhou 412008, Hunan, China
Keywords:
equilibrium equation;  interaction;  composite foundation;  flexible pile;  friction
PACS:
TU473
DOI:
-
Abstract:
Based on flexible pile side friction in the multi-element composite foundation, the distribution regularity was expressed by the relative displacement between flexible pile and surrounding soil. By combining deformation harmonious condition, physics equation and equilibrium equation of force, interaction of flexible pile-soil-cushion were analyzed under rigidity pile cap, results of model tests were compared with those of calculation. Results indicate that stress concentration of pile top can be abated by cushion incrassation or cushion modulus increase; bearing capacity of composite body for flexible pile can be mobilized richly. Meanwhile, bearing capacity of composite body for flexible pile has different degrees increase by increasing rigidity of flexible pile, or enhancing cushion thickness or modulus. Maximal pile side friction lies on 1/4 to 1/3 piles below pile top. Because there is negative friction area in pile owing to pile top sticks into cushion, maximal axial force in pile does not lie on pile top, as rigidity of flexible pile is not very big, sticking action of pile top is faintish, length of negative friction area is very short, and negative friction is very small. The comparison indicates that the proposed method is feasible and has significant guidance for the composite foundation design.

References:

[1] 郑俊杰,区剑华,吴世明,等.多元复合地基的理论与实践[J].岩土工程学报,2002,24(2):208-212. ZHENG Jun-jie,OU Jian-hua,WU Shi-ming,et al.Theory and Practice of Multi-element Composite Ground[J].Chinese Journal of Geotechnical Engineering,2002,24(2):208-212.
[2]郑俊杰,区剑华,袁内镇,等.多元复合地基压缩模量参变量变分原理解析解[J].岩土工程学报,2003,25(3):317-321. ZHENG Jun-jie,OU Jian-hua,YUAN Nei-zhen,et al.Analytical Solutions of Composite Modulus of Multi-element Composite Foundation by Parametric Vari-ational Principle[J].Chinese Journal of Geotechnical Engineering,2003,25(3):317-321.
[3]葛忻声,龚晓南,张先明.长短桩复合地基设计计算方法的探讨[J].建筑结构,2002(7):3-4. GE Xin-sheng,GONG Xiao-nan,ZHANG Xian-ming.Calculation of the Long-short-pile Composite Foundation[J].Building Structure,2002(7):3-4.
[4]杨军龙,龚晓南,孙邦臣.长短桩复合地基沉降计算方法探讨[J].建筑结构,2002(7):8-10. YANG Jun-long,GONG Xiao-nan,SUN Bang-chen.Discussion on the Calculation Method of Settlement of the Long-short-pile Composite Foundation[J].Building Structure,2002(7):8-10.
[5]郑俊杰,袁内镇,张小敏.多元复合地基的承载力计算及检测方法[J].岩石力学与工程学报,2001,20(3):391-393. ZHENG Jun-jie,YUAN Nei-zhen,ZHANG Xiao-min.Computation andTesting Methods for the Bearing Capacity of Multi-element Composite Foundation[J].Chinese Journal of Rock Mechanics and Engin-eering,2001,20(3):391-393.
[6]闫明礼,王明山,闫雪峰,等.多桩型复合地基设计计算方法探讨[J].岩土工程学报,2003,25(3):352-355. YAN Ming-li,WANG Ming-shan,YAN Xue-feng,et al.Study on the Calculation Method of Multi-type-pile Composite Foundation[J].Chinese Journal of Geotechnical Engineering,2003,25(3):352-355.
[7]ZHU K,XU R Q,GUO Y,et al.Test Research on the Behavior of Composite Foundations Incorporating Rigid and Flexible Piles[C]//PORBAHA A,SHEN S L,WARTMAN J,et al.Ground Modification and Seismic Mitigation.Shanghai:ASCE,2006:313-320.
[8]RANDOLPH M F,WROTH C P.Analysis of Deformation of Vertically Loaded Piles[J].Journal of Geotechnical Engineering,1978,104(12):1465-1488.
[9]叶书麟.地基处理工程实例应用手册[M].北京:中国建筑工业出版社,1998. YE Shu-lin.Handbook on Example of Foundation Treatment Engineering[M].Beijing:China Architecture & Building Press,1998.
[10]李翠英.柔性基层在衡德高速公路上的试验研究[J].筑路机械与施工机械化,2006,23(6):15-17. LI Cui-ying.Experimental Research of Flexible Base on Hengshui-Dezhou Expressway[J].Road Machin-ery & Construction Mechanization,2006,23(6):15-17.
[11]蒋 鑫,凌建明.软土地区桩柱式路基力学行为的数值模拟[J].交通运输工程学报,2007,7(6):70-75. JIANG Xin,LING Jian-ming.Numerical Simulation of Mechanical Behavior for Pile-column-supported Subgrade over Soft Ground[J].Journal of Traffic and Transportation Engineering,2007,7(6):70-75.
[12]蒋建平,罗国煜,高广运.粘性土变形和强度参数分析[J].交通运输工程学报,2007,7(6):76-79. JIANG Jian-ping,LUO Guo-yu,GAO Guang-yun.Analysis of Deformation and Strength Parameters for Cohesive Clay[J].Journal of Traffic and Transportation Engineering,2007,7(6):76-79.

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Last Update: 2008-12-20