土工基础

土工基础 ›› 2025, Vol. 39 ›› Issue (4): 611-617.

• 专题论述 • 上一篇    下一篇

深厚淤泥层预钻孔管桩挤土效应宏细观分析

李太峰1，张瑞元2，姬付全2，陈培帅2，高 冉2   

  1. （1.云南省公路路政管理总队（云南省综合交通发展中心），昆明 650031；2.中交第二航务工程局有限公司，武汉 430040）
  • 收稿日期:2025-03-18 修回日期:2025-04-07 出版日期:2025-08-31 发布日期:2025-08-27
  • 作者简介:李太峰（1980-），男，工程师，研究方向为公路工程等。
  • 基金资助:
    中国港湾重大科技研发项目（2024-ZGKJ-TDYF-01）

Macroscopic and Microscopic Analysis of Soil Squeezing Effect of Pre-drilled Pipe Piles in Thick Peaty Soil Layers

LI Taifeng1, ZHANG Ruiyuan2, JI Fuquan2, CHEN Peishuai2, GAO Ran2   

  1. (1.Yunnan Provincial Highway Administration Management Division；
    (Yunnan Provincial Comprehensive Transportation Development Center), Kunming 650031;
    2.China Communications Second Harbor Engineering Co. Ltd., Wuhan 430040)
  • Received:2025-03-18 Revised:2025-04-07 Online:2025-08-31 Published:2025-08-27

摘要： 为定量研究淤泥地层中预钻孔参数对管桩挤土效应的影响规律，依托海陵岛大桥桥头软基路段，开展管桩成桩现场试验，研究预钻孔管桩对桩周土体挤压变形影响。结果表明：预钻孔措施使土体向钻孔中心方向进行偏移，管桩施工使土体向相反方向发生明显偏移，挤土效应的影响范围大于13D(D为桩径)。淤泥地层中的超孔隙水压力线性急剧增大后，短期内保持较稳定的数值。在此基础上，建立了离散元模型，横向水平位移的计算值与现场监测结果吻合度较高。位移场整体上可划分为三部分，桩顶以下2/3桩身范围内为隆起位移区，桩端以上1/3桩身范围内为水平位移区，桩端以下区域为下沉位移区，位移场整体上呈“倒锥形”分布，水平方向呈“条带状”特征。当预钻孔率和预钻孔深入率在0.5以上时，对挤土效应的减轻作用较明显，建议在工程中将预钻孔率和预钻孔深入率分别设置在0.5以上和0.5~0.8之间。

关键词: 道路工程, 土体水平位移, 离散元, 挤土效应, 深厚淤泥

Abstract: To quantitatively study the influence of pre-drilled borehole parameters on the soil squeezing effect of pipe piles in peaty soils, field tests were conducted on the driving of of pipe piles in soft soils in a trail site at the bridge abutment area of Hailing Island Bridge to investigate the effect of pre-drilled pipe piles on the soil squeezing deformation around the piles. The results showed that pre-drilling measures caused the soil to shift towards the center of the borehole, while pipe pile driving caused the soil to shift significantly in the opposite direction. The impact range of soil squeezing was greater than 3D (D is the pile diameter). After a sharp linear increase in the pressure of excess pore water pressure in peaty soils, it maintains a relatively stable value in the short term. On this basis, a discrete element model was established, and the calculated values of lateral horizontal displacement were in good agreement with the on-site monitoring results. The displacement field can be divided into three parts. The area below the pile top and 2/3 of the pile body is the uplift displacement zone, the area above the pile end and 1/3 of the pile shaft is the horizontal displacement zone, and the area below the pile end is the subsidence displacement zone. The displacement field is distributed in an inverted cone shape and has a strip-shaped characteristic in the horizontal direction. When the pre-drilling rate and pre-drilling depth are above 0.5, the reduction effect on soil squeezing is more significant. It is recommended to set the pre-drilling rate and pre-drilling depth between 0.5 and 0.8 in the project, respectively.

Key words: Roadway Engineering, Horizontal Displacement of Soil Mass, Discrete Element, Squeezing Effect, Thick Peaty Soils

中图分类号: