[1]董春晖,郭聚坤.基于隔时复压试验的静压桩承载力时效性研究[J].山东建筑大学学报,2017,(04):390-395.
 Dong Chunhui,Guo Jukun.Time effect of bearing capacity of jacked pile based on interval repressed test[J].,2017,(04):390-395.
点击复制

基于隔时复压试验的静压桩承载力时效性研究()
分享到:

《山东建筑大学学报》[ISSN:1673-7644/CN:37-1449/TU]

卷:
期数:
2017年04期
页码:
390-395
栏目:
工程实践
出版日期:
2017-08-15

文章信息/Info

Title:
Time effect of bearing capacity of jacked pile based on interval repressed test
文章编号:
1673-7644(2017)04-0390-06
作者:
董春晖郭聚坤
(山东交通职业学院 公路与建筑学院,山东 潍坊 261206)
Author(s):
Dong ChunhuiGuo Jukun
(School of Highway and Architecture, Shandong Transport Vocational College, Weifang 261206, China)
关键词:
静压桩隔时复压试验侧摩阻力端阻力时效性
Keywords:
jacked pile interval repressed test shaft resistance tip resistance time effect
分类号:
TU473
文献标志码:
A
摘要:
静压桩沉桩结束后,其承载力随时间而变化,对桩承载力的时效性研究可为静压桩设计及施工提供参考。文章以山东省潍坊市滨海经济开发区滨湖苑小区工程现场为试验场地,通过两根静压桩进行的隔时复压试验的实测数据,研究了广义极限承载力与最终压桩力的关系、桩端阻力和侧摩阻力随时间变化规律,提出了静压桩承载力三阶段增长模型。结果表明:广义极限承载力不同于最终压桩力,其提高主要是在沉桩结束的9 d内;在沉桩结束后20 h时,桩端阻力和桩侧摩阻力对桩承载力的贡献各为50%,出现“贡献平衡点”,压桩结束13 d后变为侧摩阻力主要起承载作用,出现“侧阻绝对硬化”和“端阻相对软化”现象;不同的土层提供不同的桩侧摩阻力,粉质粘土最大,砂质粉土和粉土次之,淤泥质土最小;静压桩承载力增长模型由三阶段组成,桩端阻力的增长仅发生在第一阶段,桩侧摩阻力的大幅度增长集中在第一、二阶段,在第三阶段略有提高。
Abstract:
The bearing capacity of jacked pile varies with timeafter the end of pile jacking, and the study on the time effect of bearing capacity of jacked pile has some implications for the design and construction of jacked pile. This paper, by taking the project Binhuyuan Community, Binhai economic development zone, Weifang City, Shandong Province as the test site, compares the measured data of two piles, studies the relationship between the general ultimate bearing capacity and ultimate compressive strength, and the growth law of tip resistance and shaft resistance, and also proposes the bearing capacity of jacked pile increase model in three stages. The results show that, the general ultimate bearing capacity is different from the ultimate pile load, which increases mainly in the 9 days after the end of pile jacking, and grows faster in the initial stage than the later stage. At 20 hours after the end of pile jacking, the contribution of tip resistance and shaft resistance to bearing capacity of pile is the same, 50 percent respectively, called “contribution balance point ”. The increase of ultimate bearing capacity of the jacked pile is mainly determined by shaft resistance on 13 days after the end of pile jacking, “absolute hardening of shaft resistance” and “relative softening of tip resistance” occurred. Different soil layers provide different shaft resistance, the silty clay is the largest, sandy silt and silty soil are the second, and the silt soil is the smallest. The static pressure pile bearing capacity growth model is composed of three stages, the increase of the pile end resistance is only in the first stage, the large increase of the pile side friction resistance is concentrated in the first and the two stage, and slightly increases in the third stage.

参考文献/References:

[1] Fellenius B.H., Edde R.D., Beriault L.L.. Dynamic and static testing for pile capacity in a finegrained soil[C]. The Hague: Proceeding of the Fourth International Conference on the Application of Stresswave Theory to Piles,1992.[2] Skov R., Denver H.. Timedependence of bearing capacity of piles[C].Vancouver: Proceeding of the Third International Conference on the Application of StressWave Theory to Piles,1988.[3] 胡中雄.饱和软粘土中单桩承载力随时间的增长[J].岩土工程学报,1985,7(3):58-61.[4] 张明义.静力压入桩的研究与应用[M].北京:中国建材工业出版社,2004.[LL] [5] 李雄,刘金砺.饱和软土中预制桩承载力时效研究[J].岩土工程学报,1992,14(4):9-16.[6] 刘俊伟.静压开口混凝土管桩施工效应试验及理论研究[D].杭州:浙江大学,2012.[7] 周晓龙,姬耀斌,萧凡,等.施工周期下静压管桩优化设计计算[J].工程勘察,2014,42(4):17-20, 29.[8] 董光辉.静压桩沉桩过程中的侧阻退化及沉桩后侧阻时效研究[J].低温建筑技术,2009(3):76-79.[9] 杨校辉,朱彦鹏,黄雪峰.静压桩荷载传递与承载性状试验研究[J].水利与建筑工程学报,2016,14(1):139-143.[10] 牛永昌,辛翀,张明义.烟台某工程静压桩隔时复压试验分析[J].青岛理工大学学报,2016,37(2):26-29, 67.[11] 郑添寿.复压法估算静压预制桩承载力试验[J].工程勘察,2016,44(2):27-30.[12] 付凯.静压管桩单桩承载力及其与压桩力关系研究[D].邯郸:河北工程大学,2014.[13] 李镜培,李林,孙德安,等.基于总应力法的静压桩极限承载力时效性研究[J].岩土工程学报,2016,38(12):2154-2163.[14] 辛翀.静压桩贯入阻力实测分析与数值模拟[D].青岛:青岛理工大学,2014.[15] 白晓宇,张明义,寇海磊,等.基于BP神经网络的静压桩承载力时间效应预测[J].工程勘察,2014,42(4):7-11.[16] 寇海磊,张明义,刘俊伟.基于光纤传感技术静压桩承载力时效性机理分析[J].岩土力学,2013,34(4):1082-1088.[17] Camp W. M., Parmar H. S.. Characterization of pile capacity with time in the cooper marlstudy of application of a past approach to predict longterm pile capacity[J]. Journal of the Transportation Research Board,1999,1663:16-24.[18] Komurka V. E.,Wagner A. B., Edil T. B.. Estimating soil/pile setup[R].Wisconsin: Wisconsin Department of Transportation,2003.

备注/Memo

备注/Memo:
收稿日期:2017-07-08 作者简介:董春晖(1977-),男,讲师,硕士,主要从事基础工程等方面的研究.Email:chunhui_d@126.com
更新日期/Last Update: 2017-07-05