理论与试验研究

静钻根植桩扩大头抽排水模型试验研究

  • 俞杉 ,
  • 邓岳保 ,
  • 胡书豪 ,
  • 郑荣跃 ,
  • 张日红
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  • 1.宁波大学 滨海城市轨道交通协同创新中心,浙江 宁波 315211;
    2.宁波市能源地下结构重点实验室(宁波大学),浙江 宁波 315211;
    3.宁波中淳高科股份有限公司,浙江 宁波 315145
俞杉(1999—),男,浙江宁波人,硕士生,主要从事软土地基与地下结构工程研究。E-mail:1194638266@qq.com
邓岳保(1983—),男,湖南岳阳人,博士,教授,主要从事软土地基与地下结构工程研究。E-mail:dengyuebao@nbu.edu.cn

收稿日期: 2024-12-18

  网络出版日期: 2025-10-17

基金资助

宁波市自然科学基金(2023J004);宁波市重点研发计划暨"揭榜挂帅"项目(2022Z224)

Experimental Study on the Enlarged Head Pumping and Drainage Model of Static Drilling Rooted Pile

  • Yu Shan ,
  • Deng Yuebao ,
  • Hu Shuhao ,
  • Zheng Rongyue ,
  • Zhang Rihong
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  • 1. Collaborative Innovation Center of Coastal Urban Rail Transit, Ningbo University, Ningbo, Zhejiang 315211, P.R. China;
    2. Ningbo Key Laboratory of Energy Structure Underground, Ningbo University, Ningbo, Zhejiang 315211, P.R. China;
    3. Ningbo Zhongchun Hi-Tech Co., Ltd., Ningbo, Zhejiang 315145, P.R. China

Received date: 2024-12-18

  Online published: 2025-10-17

摘要

静钻根植桩是一种绿色环保的桩基工法,主要由PHC管桩和桩周水泥土构成,并且在桩端附近增加扩大头处理。为了加速并提升静钻根植桩扩大头部位水泥土的固化,进一步增强桩基承载力,提出在桩端扩大头设置竖向排水通道并联合真空负压排水固结的技术。通过开展模型试验,对比分析普通静钻根植桩与扩大头抽排水静钻根植桩的承载性能。结果表明:在扩大头进行真空负压抽排水,可以加快扩大头桩周水泥土的硬化,使其比传统静钻根植桩更早达到最终强度;真空负压排水固结在一定程度上加固了桩周土体和桩端土体;扩大头抽排水桩在成桩28 d时的极限承载力相比普通桩承载力提升约59%。

本文引用格式

俞杉 , 邓岳保 , 胡书豪 , 郑荣跃 , 张日红 . 静钻根植桩扩大头抽排水模型试验研究[J]. 地下空间与工程学报, 2025 , 21(5) : 1621 -1628 . DOI: 10.20174/j.JUSE.2025.05.16

Abstract

Static drilling and rooted pile is a green and environmentally friendly pile foundation construction method, which is mainly composed of PHC pipe pile and cement soil around the pile, and the expansion head treatment is added near the pile end. In order to accelerate and enhance the solidification of cement soil at the head of static drilling pile and further enhance the bearing capacity of pile foundation, the technology of vertical drainage channel and vacuum negative pressure drainage at the expanding head of pile end is proposed. Model tests were carried out to compare the bearing capacity of static drilling pile and static drilling pile with extended head pumping and drainage. The test results show that: The vacuum negative pressure drainage can accelerate the hardening of soil-cement around the enlarged head pile and make it reach the final strength earlier than the traditional static drilling pile. Vacuum negative pressure drainage consolidation strengthens the soil around the pile and the soil at the end of the pile to a certain extent. The ultimate bearing capacity of the enlarged head drainage pile at 28 days of pile formation is about 59% higher than that of the ordinary pile.

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