复杂场地下抗拔桩抗拔力的试验及模拟与应用研究

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英文篇名：Test,simulation and application of pull-out resistance of uplift piles in complex sites 作者：杜明芳 ; 王强 ; 王硕 ; 李艺博 ; 刘胜欢 英文作者：DU Mingfang;WANG Qiang;WANG Shuo;LI Yibo;LIU Shenghuan;School of Civil Engineering and Architecture,Henan University of Technology; 关键词：抗拔桩 ; 抗拔力 ; 泥皮 ; 沉渣 ; 抗拔试验 ; 后注浆 ; 数值模拟 英文关键词：uplift pile;;pullout force;;muddy skin;;sediment;;pullout test;;post-grouting;;numerical simulation 中文刊名：ACZJ 英文刊名：Sichuan Building Science 机构：河南工业大学土木建筑学院; 出版日期：2019-06-25 出版单位：四川建筑科学研究 年：2019 期：v.45;No.203 语种：中文; 页：ACZJ201903019 页数：6 CN：03 ISSN：51-1142/TU 分类号：86-91

摘要

以郑州某工程抗拔试验桩单桩抗拔承载力试验结果为基础,对抗拔桩成桩过程进行了研究。从施工角度分析了导致抗拔桩抗拔力不足的原因,分别从施工工艺、化学造浆以及采用桩端桩侧复式后注浆工艺等方面来减小泥皮和沉渣对桩侧摩阻力和端阻力的影响。用单桩抗拔静载试验结果证明了桩端桩侧复式后注浆可以大幅度提高单桩抗拔力,并用公式验证了有泥皮和沉渣存在的情况下桩侧摩阻力和端阻力的减小以及注浆后的增强。最后说明了加强桩端后注浆对桩抗拔力的提高效果明显,并通过数值模拟证实了该点。
        Based on the test results of the pull-out bearing capacity of a single pile of a pull-out test pile in a project in Zhengzhou,the process of pile-up against pile-pulling was studied.From the construction point of view,the causes of the lack of pull-out resistance of uplift piles were analyzed.The effects of mud and sediment on the frictional resistance and end-resistance of piles were reduced from the aspects of construction technology,chemical pulping and double post-grouting technology.The results of single-pile static loading test proved that the double post grouting at the pile tip could greatly increase the pull-out force of the single pile.And formulas were used to verify the reduction of pile-side resistance and end-resistance in the presence of mud and sediment and the enhancement after grouting.Finally,it is shown that the effect of post-grouting on strengthening the pile's pullout resistance is obvious,and confirm this point by numerical simulation.

引文

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