静钻根植桩桩土界面抽排水模型试验及数值模拟研究
PDF下载 (150)俞 杉,邓岳保,郑文喜.静钻根植桩桩土界面抽排水模型试验及数值模拟研究[J].宁波大学学报(理工版),2025,38(4):11-18.DOI:10.20098/j.cnki.1001-5132.2024.0912
YU Shan,DENG Yuebao,ZHENG Wenxi.Experimental and numerical simulation study on the pumping and drainage model of the soil interface of static drilling rooted piles[J].Journal of Ningbo University(Natural Science & Engineering Edition),2025,38(4):11-18.DOI:10.20098/j.cnki.1001-5132.2024.0912
| Title: | Experimental and numerical simulation study on the pumping and drainage model of the soil interface of static drilling rooted piles |
| 作者: | 俞 杉, 邓岳保, 郑文喜 |
| Author(s): | YU Shan, DENG Yuebao, ZHENG Wenxi |
| 关键词: | 静钻根植桩; 排水桩; 排水固结; 模型试验; 数值模拟 |
| Keywords: | static drilling and rooted pile; drainage pile; drainage consolidation; modeltest; numerical simulation |
| 分类号: | TU473 |
| DOI: | 10.20098/j.cnki.1001-5132.2024.0912 |
| 文献标识码: | A |
| 摘要: | 为了进一步优化静钻根植排水桩技术，提出在桩侧水泥土与软土界面之间设置塑料排水带（竖井）的改进方法，然后通过模型试验和Plaxis 3D数值模拟对改变竖井位置的桩基承载性能和抽水效果进行对比分析。结果表明：桩土界面抽排水桩的抽水效果明显优于桩侧绑扎排水带的模型桩，前者能够在抽排水后期持续抽取土体中的水分，不受水泥土固化的影响；桩土界面抽排水对桩周土层的加固范围为2.0倍桩径，桩侧绑扎排水对桩周土层的加固范围为1.5倍桩径；相较于传统静钻根植桩和排水桩，新型排水桩抽水72h后其极限承载力分别提升了24.2%和8.9%；数值模拟结果表明，在理想抽水效率下桩土界面抽排水桩的极限承载力比普通桩提升70%。 |
| Abstract: | To further enhance the static drilling rooted drainage pile technology, an improvement measure involving the installation of plastic drainage belts (vertical shafts) at the interface between cement soil and soft soil on the side of the pile is proposed. Subsequently, through model experiments and numerical simulations, the bearing performance and pumping effect of pile foundations with varying vertical shaft positions are compared and analyzed. The results indicate that the pumping effect of the drainage pile at the pile-soil interface is significantly superior to that of the model pile with a drainage belt attached to its side. The former can continuously extract water from the surrounding soil during later stages of pumping and drainage without being hindered by cement soil solidification. Furthermore, the reinforcement range around the pile due to pumping and drainage at the pile-soil interface extends up to twice the diameter of the pile, whereas binding a drain on its side only affects an area 1.5 times its diameter. In comparison to the traditional static drilling rooted piles and conventional drainage piles, after three days of pumping, this new type of drainage pile exhibits an increase in ultimate bearing capacity by 24.2% and 8.9%, respectively. Numerical simulation analysis reveals that, under optimal pumping efficiency conditions, the ultimate bearing capacity could be enhanced by as much as 70%. |
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| 备注/Memo: | 收稿日期：2024−09−20 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ 基金项目：宁波市自然科学基金重点项目（2023J004）；宁波市重大科技任务攻关项目（2022Z224） 第一作者：俞 杉，硕士研究生，主要研究方向为软土地基与地下结构。E-mail: 1194638266@qq.com *通信作者：邓岳保，博士/教授，主要研究方向为软土地基与地下结构。E-mail: dengyuebao@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
