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夯扩碎石桩群桩承载性状研究

, PP. 26-31

Keywords: 道路工程,夯扩碎石桩,载荷试验,群桩,地基处理,数值分析

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Abstract:

?对2个初始直径为0.76m、桩长为2.79m和5.10m的夯扩碎石桩群桩进行载荷试验,并采用三维拉格朗日有限差分程序建立数值模型,模拟其夯扩和载荷试验分级加载过程,并分析了桩土应力比、群桩效应和桩间土单元的应力路径。结果表明:数值分析很好地模拟了夯扩碎石群桩的夯扩过程,群桩夯扩成桩后最大垂直位移位于桩间土中心且表现为地面隆起;计算和实测的荷载-沉降曲线基本一致;2个不同桩长的夯扩碎石桩群桩在各级荷载下的桩土应力比都比较接近,其值在3.8~6.5之间;群桩效应跟桩长与承台宽度比L/Bc相关,群桩负效应随L/Bc的增大而减弱;2个不同桩长的群桩桩间土单元在夯扩过程中其水平应力大于垂直应力,单元应力处于临界破坏状态;夯扩作用在桩间土中产生预应力,提高了土体刚度和夯扩碎石桩的承载能力,靠近桩端的土体单元预应力受桩端夯扩效应影响而增大。

References

[1]  张建立.夯扩挤密碎石桩在沿海高速公路地基处理中的应用[J].公路交通技术,2007(2):8-10.
[2]  赵明华,曾昭宇,刘晓明,等.考虑轴向横向荷载共同作用的基桩可靠度[J].建筑科学与工程学报,2005,22(2):57-60.
[3]  WISSMANN K J,FOX N S,MARTIN J P.Rammed Aggregate Piers Defeat 75-foot Long Driven Piles[C]//LUTENEGGER A J,DEGROOT D J.Proceedings of the ASCE Geo-institute Specialty Conference on Performance Confirmation of Constructed Geotechnical Facilities.Amherst:ASCE,2000:198-210.
[4]  YI Wei-jian,YANG Sui-xin.Soil-structure Dynamic Interaction Based on Soft Soil Foundation[J].Journal of Architecture and Civil Engineering,2005,22(2):61-65.
[5]  CHEN Hui,LEI Sheng-you.Influential Factors of Compaction Test of Soil[J].Journal of Architecture and Civil Engineering,2005,22(2):69-71.
[6]  PHAM H T V,WHITE D J.Support Mechanisms of Rammed Aggregate Piers Ⅱ:Numerical Analyses[J].Journal of Geotechnical and Geoenvironmental Engin-eering,2007,133(12):1512-1521.
[7]  《桩基工程手册》编写委员会.桩基工程手册[M].北京:中国建筑工业出版社,1995.
[8]  廖丽萍,王启智.水平荷载作用下分层土体群桩复合地基中圆桩与方桩的变形性状[J].建筑科学与工程学报,2008,25(3):115-121.
[9]  刘 杰,何 杰.多元复合地基中柔性桩-土-垫层的相互作用[J].建筑科学与工程学报,2008,25(4):36-41.
[10]  ROSCOE K H,BURLAND J B.On the Generalized Stress-strain Behavior of Wet Clay[C]//HEYMAN J,LECKIE F.Engineering Plasticity.Cambridge:Cambridge University Press,1968:535-609.
[11]  ZHANG Jian-li.Application of Ram-compaction Gravel Piles in Foundation Treatment for Coastal Expressways[J].Technology of Highway and Transport,2007(2): 8-10.
[12]  ZHAO Ming-hua,ZENG Zhao-yu,LIU Xiao-ming,et al.Reliability of Pile Foundation Under Vertical and Lateral Loads[J].Journal of Architecture and Civil Engineering,2005,22(2):57-60.
[13]  易伟建,杨随新.软土地基上的土-结构动力相互作用[J].建筑科学与工程学报,2005,22(2):61-65.
[14]  陈 辉,雷胜友.土的击实试验影响因素[J].建筑科学与工程学报,2005,22(2):69-71.
[15]  PHAM H T V.Support Mechanism of Rammed Aggregate Piers[D].Ames:Iowa State University,2005.
[16]  GOUGHNOUR R R,BAYUK A A.A Field Study of Long-term Settlements of Loads Supported by Stone Columns in Soft Ground[C]//ICSRR.Proc.Int.Conf. on Soil Reinforcement: Reinforced Earth and Other Techniques.Paris:ICSRR,1979:279-286.
[17]  Compilation Committee for Handbook of Pile Engin-eering.Handbook of Pile Engineering[M].Beijing:China Architecture & Building Press,1995.
[18]  LIAO Li-ping,WANG Qi-zhi.Deformation Property of Circular Pile and Square Pile in Pile Group Composite Foundation Under Horizontal Load in Multi-layered Soil[J].Journal of Architecture and Civil Engineering,2008,25(3):115-121.
[19]  LIU Jie,HE Jie.Interaction of Flexible Pile-soil-cushion in Multi-element Composite Foundation[J].Journal of Architecture and Civil Engineering,2008,25(4):36-41.

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