[1]黄挺,龚维明,戴国亮.不同土表堆载分布形式下桩基负摩阻力特性模型试验[J].东南大学学报(自然科学版),2015,45(6):1169-1174.[doi:10.3969/j.issn.1001-0505.2015.06.026]
 Huang Ting,Gong Weiming,Dai Guoliang.Model tests on characteristics of pile foundation negative skin friction under different distributions of surcharge load[J].Journal of Southeast University (Natural Science Edition),2015,45(6):1169-1174.[doi:10.3969/j.issn.1001-0505.2015.06.026]
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不同土表堆载分布形式下桩基负摩阻力特性模型试验()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
45
期数:
2015年第6期
页码:
1169-1174
栏目:
土木工程
出版日期:
2015-11-20

文章信息/Info

Title:
Model tests on characteristics of pile foundation negative skin friction under different distributions of surcharge load
作者:
黄挺12龚维明2戴国亮2
1河海大学海岸灾害及防护教育部重点实验室, 南京210098; 2东南大学土木工程学院, 南京210096
Author(s):
Huang Ting12 Gong Weiming2 Dai Guoliang2
1Key Laboratory of Coastal Disaster and Defence of Ministry of Education, Hohai University, Nanjing 210098, China
2School of Civil Engineering, Southeast University, Nanjing 210096, China
关键词:
桩基 负摩阻力 模型试验 堆载 中性点
Keywords:
pile foundation negative skin friction model test surcharge load neutral plane
分类号:
TU473.1
DOI:
10.3969/j.issn.1001-0505.2015.06.026
摘要:
为了研究土表堆载分布形式对桩基负摩阻力作用的影响,设计实施了边载及围载作用下的单桩室内模型试验.桩周土采用细砂与饱和黏土,于加载过程中测定桩身应变、桩顶位移以及土体分层沉降.试验结果表明,土表堆载分布形式对桩基附加沉降具有较明显的影响,砂土中桩基在边载分级加载作用下的附加沉降约为围载时的77%,试验结束时黏土中桩基在边载作用下的附加沉降约为围载时的74%.边载作用下砂土及黏土中桩基中性点深度分别比围载时低约0.03L~0.08L和0.02L(L为有效桩长).在砂土承受土表堆载分级加载作用或者黏土排水固结的后期,因桩土相对位移不足以完全发挥负摩阻力作用,土表堆载分布形式对桩基负摩阻力影响减弱.
Abstract:
To study the influences of the distribution of the surcharge load on the negative skin friction(NSF)on the pile foundation, indoor model tests for the single pile under surrounding loading and side loading are carried into execution. Fine sand and saturated clay are used in tests as the soil around pile. The pile strain, pile top settlement and soil layer settlement are measured during the loading. The results indicate that the distribution of the surcharge load has an obvious effect on the pile additional settlement. The pile additional settlement in sand under step side loading is about 77% of that under step surrounding loading, and at the end of the tests, the pile additional settlement in clay under side loading is about 74% of that under surrounding loading. The depth of the neutral plane of the pile under side loading in sand and that in clay are 0.03L ~ 0.08L and 0.02L than that under surrounding loading, respectively, where L is the effective length of pile. In the late stage of the process of surcharge loading on sand or drainage consolidation of clay, the effect of the distribution of the surcharge load on the NSF on the pile decreases gradually because the relative displacement between the pile and soil is not enough to motivate the NSF fully.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期: 2015-06-30.
作者简介: 黄挺(1983—),男,博士;戴国亮(联系人),男,博士,教授,博士生导师,daigl@seu.edu.cn.
基金项目: 国家自然科学基金资助项目(51408185)、江苏省自然科学基金资助项目(BK20130843)、江苏省博士后科研资助计划资助项目(1302048B)、中国博士后科学基金资助项目(2014M561564).
引用本文: 黄挺,龚维明,戴国亮.不同土表堆载分布形式下桩基负摩阻力特性模型试验[J].东南大学学报:自然科学版,2015,45(6):1169-1174. [doi:10.3969/j.issn.1001-0505.2015.06.026]
更新日期/Last Update: 2015-11-20