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基于沉降控制的组合后压浆灌注桩承载力计算研究

戴国亮, 万志辉, 龚维明, 王磊

戴国亮, 万志辉, 龚维明, 王磊. 基于沉降控制的组合后压浆灌注桩承载力计算研究[J]. 岩土工程学报, 2018, 40(12): 2172-2181. DOI: 10.11779/CJGE201812003
引用本文: 戴国亮, 万志辉, 龚维明, 王磊. 基于沉降控制的组合后压浆灌注桩承载力计算研究[J]. 岩土工程学报, 2018, 40(12): 2172-2181. DOI: 10.11779/CJGE201812003
shu
DAI Guo-liang, WAN Zhi-hui, GONG Wei-ming, WANG Lei. Calculation of bearing capacity for combined post-grouting bored piles based on settlement control[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(12): 2172-2181. DOI: 10.11779/CJGE201812003
Citation: DAI Guo-liang, WAN Zhi-hui, GONG Wei-ming, WANG Lei. Calculation of bearing capacity for combined post-grouting bored piles based on settlement control[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(12): 2172-2181. DOI: 10.11779/CJGE201812003
shu

基于沉降控制的组合后压浆灌注桩承载力计算研究  English Version

  • 1. 东南大学混凝土及预应力混凝土教育部重点实验室,江苏 南京 210089;
    2. 东南大学土木工程学院,江苏 南京 210089;
    3. 南京东大自平衡桩基检测有限公司,江苏 南京 210018

基金项目: 国家自然科学基金项目（51478109,51678145）; 国家重点研发计划专项项目（2017YFC0703408）; “六大人才高峰”高层次人才选拔培养资助项目（XNY-047）
详细信息
    作者简介:

    戴国亮(1975- ),男,博士,教授,博士生导师,主要从事岩土工程教学和科研工作。E-mail：daigl@seu.edu.cn。

  • 中图分类号: TU473

Calculation of bearing capacity for combined post-grouting bored piles based on settlement control

  • 1. MOE Key Laboratory for RC and PRC Structure, Nanjing 210089, China;
    2. School of Civil Engineering, Southeast University, Nanjing 210089, China;
    3. Nanjing Dongda Self-Balance Pile Foundation Inspection Co., Ltd., Nanjing 210018, China

摘要

    摘要
  • 摘要: 以沉降控制标准为原则来确定后压浆灌注桩的承载力有着重要的实际意义。基于石首长江公路大桥工程开展的6根大直径钻孔灌注桩现场静载试验,通过对比分析桩端桩侧组合压浆桩压浆前后的试验结果,研究了组合后压浆对深厚细砂层钻孔灌注桩承载变形性状的影响,在此基础上通过统计得出了在不同桩顶沉降条件下桩端阻力增强系数、桩侧阻力增强系数的取值范围,并给出了一种基于沉降控制标准的组合后压浆桩承载力设计方法,最后通过工程实例验证了该设计方法的合理性。结果表明,组合后压浆条件下的深厚细砂层钻孔灌注桩承载变形性能显著提升,且承载力提高幅度随着桩顶沉降的增加逐渐增大;组合后压浆桩加载至极限状态时,其极限承载力至少提高66%,且能有效地控制桩基沉降量;同时组合压浆后能有效地改善桩端支承性能与桩侧受力特性,显著提高桩端阻力和桩侧摩阻力,并对桩基的荷载传递特性产生明显影响。此外,设计计算方法能较好地给出组合后压浆桩荷载沉降关系的范围,可保守地将计算结果的下限作为工程设计使用。
    Abstract: It is of great practical significance to determine the bearing capacity of post-grouting piles on the basis of the principle of settlement control. Based on the field static load tests on six large-diameter cast-in-situ bored piles of Shishou Yangtze River Highway Bridge project, the influences of combined post-grouting on the bearing and deformation behaviors of cast-in-situ bored piles in deep fine sand layer are studied by comparing the field test results before and after combined post-grouting. The range of improvement coefficient for the tip resistance and shaft resistance under different pile head settlements is obtained through statistical analysis on the basis of the field test results, and a design method for the bearing capacity of combined post-grouting pile based on settlement control criterion is presented. Finally, a case history is cited to demonstrate the validity of the design method. The results show that the bearing capacity of cast-in-situ bored pile in deep fine sand layer is significantly improved under the combined post-grouting, and the improved range of bearing capacity increases with the increasing settlement of the pile head. Moreover, the ultimate bearing capacity of combined post-grouting pile is increased by at least 66% under the ultimate loading, and the settlement of pile head can be controlled effectively. Meanwhile, the bearing performances of the pile tip and mechanical characteristics of the pile side can be improved effectively, the tip resistance and side resistance are significantly improved by the combined post-grouting, and the load transfer characteristics of the pile have a significant impact. Additionally, the proposed method can well give the range of load-settlement relationship of combined post-grouting pile. It is suggested that the calculated lower bound should be used conservatively in engineering design.
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  • 收稿日期:  2017-11-19
  • 发布日期:  2018-12-24

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