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深厚软土地基增强型管桩受力性状试验研究
引用本文:付贵海,魏丽敏,郭志广.深厚软土地基增强型管桩受力性状试验研究[J].土木建筑与环境工程,2012,34(1):60-65.
作者姓名:付贵海  魏丽敏  郭志广
作者单位:中南大学 土木建筑学院,长沙 410075;湖南城市学院 土木工程学院,湖南益阳 413000;中南大学 土木建筑学院,长沙 410075;中南大学 土木建筑学院,长沙 410075
基金项目:铁道部科技研究开发计划重点课题(2009G008-B);铁道部科技研究开发计划项目(2010G018-E-3);湖南省教育厅重点项目(09A016)
摘    要:增强型管桩采用离心旋转法制作,并经高温蒸养,在制桩时预埋应变计难以实现,本文研制了一种桩身埋设混凝土应变计的新方法,成功解决了这一难题。通过静载试验研究了深厚软土地基中增强型管桩的荷载传递规律及桩侧摩阻力和桩端阻力的发挥性状,探讨了增强型管桩桩身肋的荷载分担情况。试验结果表明,在竖向荷载作用下,增强型管桩桩身上部的肋比下部的肋先发挥作用,肋对桩侧摩阻力的发挥起到了明显地加强作用。

关 键 词:软土地基  增强型管桩  应变计埋设  荷载传递  桩侧摩阻力  桩端阻力

Analysis Experimental on the Bearing Behavior of Enhanced Pipe Piles in Deep Soft Soils
FU Gui-hai,WEI Li-min and GUO Zhi-guang.Analysis Experimental on the Bearing Behavior of Enhanced Pipe Piles in Deep Soft Soils[J].土木建筑与环境工程,2012,34(1):60-65.
Authors:FU Gui-hai  WEI Li-min and GUO Zhi-guang
Affiliation:College of Civil and Architectural Engineering, Central South University, Changsha 410075, P.R.China;College of Civil Engineering, Hunan City University, Yiyang 413000, Hunan, P.R.China;College of Civil and Architectural Engineering, Central South University, Changsha 410075, P.R.China;College of Civil and Architectural Engineering, Central South University, Changsha 410075, P.R.China
Abstract:enhanced pipe piles are made by centrifugal rotation and steam curing under high temperature, so it is very difficult to embed concrete strain gauges during making piles. A new method is used to embed concrete strain gauges in piles. Based on the static loading tests on enhanced pipe piles, the load transferring mechanism of enhanced pipe piles is studied through analysing axial load distribution, behaviors of skin resistance and base resistance of piles, and load sharing of rims of enhanced pipe piles. Experimental results show that when axial load acts on the top of enhanced pipe piles, the upper rims of enhanced pipe piles act on skin resistance of piles before the lower rims do, and the rims of enhanced pipe piles remarkably reinforce skin resistance of piles.
Keywords:soft soils  enhanced pipe piles  gauges embed  load transfer  skin resistance  base resistance
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