土工基础

土工基础 ›› 2021, Vol. 35 ›› Issue (1): 65-68.

• 测试技术 • 上一篇    下一篇

PHC管桩负摩阻力监测试验方法研究

韩 亮1，王向平2，付永刚2，王毅恒1，严智宇1   

  1. （1.四川轻化工大学，四川自贡 643000；2.呼和浩特市四方工程质量检测试验中心，呼和浩特 010031）
  • 收稿日期:2020-02-11 修回日期:2020-02-18 出版日期:2021-02-28 发布日期:2021-03-01
  • 作者简介:韩 亮（1970-），男，博士，教授，研究方向为地基基础检测方法和技术应用。
  • 基金资助:
    桥梁无损检测与工程计算四川省高校重点实验室资助（2019QYY02）

Research on Test Method for Negative Skin Friction Resistance Measurement of PHC Pipe Piles

HAN Liang1, WANG Xiangping2, FU Yonggang2, WANG Yiheng1, YAN Zhiyu1   

  1. (1.Sichuan University of Science and Engineering, Zigong 643000;
    2.Hohhot Sifang Engineering Quality Inspection and Test Center, Hohhot 010031)
  • Received:2020-02-11 Revised:2020-02-18 Online:2021-02-28 Published:2021-03-01

摘要： PHC管桩负摩阻力与土体性质、固结条件等复杂因素有关，理论计算难以获得可靠结果，只能采取现场试验获得桩侧负摩阻力大小、分布状况以及中性点位置。在总结点法测量桩身应力应变局限性的基础上，依托实际工程，将改进的线法测量技术引入到PHC管桩负摩阻力监测试验中。针对PHC管桩特点，提出后植测线工法，有效地解决了PHC管桩负摩阻力监测现场试验难题。通过对实测应变进行回归处理和计算，得到各级荷载下的回归应变和桩身混凝土平均弹性模量，保证了轴向力和摩阻力计算的可靠度。研究成果表明，现场试验新工法和摩阻力计算方法对PHC管桩负摩阻力监测试验十分有效。

关键词: 负摩阻力, PHC管桩, 线法测量, 桩侧摩阻力分布, 轴向力分布

Abstract: The theoretical method for calculation of the negative skin friction resistance of PHC pipe pile is difficult to obtain reliable results due to many complex factors, such as soil properties and consolidation conditions. Therefore, the distribution of negative skin friction and the position of neutral plane can only reliably be obtained by the field loading test by monitoring the internal force distributions. Based on summarizing the limitation of point measurement method of stress and strain, this paper presents a case study of a modified line measurement technique to be used in the negative skin friction in the PHC pipe pile. According to the characteristics of PHC pipe pile, a new method of postimplantation survey line was proposed to effectively resolve the difficulties in the negative skin friction field measurement in the PHC pipe pile. Through the regression data process, the measured strain and the average elastic modulus in the pile shaft under different load levels were obtained, which ensures the reliability of calculation of the axial force and the skin friction. It was shown from the results in the field test that the new field test method and calculation method of negative skin friction are very effective for the PHC pipe pile negative skin friction measurement.

Key words: negative skin friction, phc pipe pile, linear measurement method, skin friction distribution: axial force distribution

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