土工基础

土工基础 ›› 2026, Vol. 40 ›› Issue (2): 366-371.

• 测试技术 • 上一篇    下一篇

桩帽对刚性桩复合地基土拱效应的影响分析

李金明1,杨燕伟2,余朝军3，李亚军3   

  1. (1.四川省水利科学研究院，成都 610072；2.中国建筑第八工程局有限公司，成都 610095；3.中国地质大学（北京）工程技术学院，北京 100083)
  • 收稿日期:2024-02-07 修回日期:2024-04-15 出版日期:2026-04-30 发布日期:2026-04-23
  • 通讯作者: 杨燕伟（1981-），男，博士，高级工程师，研究方向为地基处理和岩土结构。
  • 作者简介:李金明(1994-)，男，硕士，工程师，研究方向为岩土工程和地基处理。
  • 基金资助:
    水利部重大科技项目（SKS-2022023）；四川省省级基本科研项目（2023-SKY-ZXKY-05）

Influence of Pile Cap on the Soil Arching Effect of Rigid Pile Composite Foundation

LI Jinming1, YANG Yanwei2, YU Chaojun3, LI Yajun3   

  1. (1.Sichuan Academy of Water Conservancy, Chengdu 610072;
    2.China Construction Eighth Engineering Division Corp. Ltd., Chengdu 610095;
    3.School of Engineering and Technology, China University of Geosciences, Beijing 100083)
  • Received:2024-02-07 Revised:2024-04-15 Online:2026-04-30 Published:2026-04-23

摘要： 为研究不同类型桩帽对刚性桩复合地基土拱效应的影响，以充分发挥刚性桩复合地基的力学性能，提高复合地基的承载力和稳定性，针对不同类型桩帽下刚性桩复合地基，开展了室内模型试验研究，结果表明：①随着路堤填筑高度的增加，桩帽顶部、桩间土土压力以及桩体荷载分担比均增大，土拱效应导致有部分路堤荷载向桩体转移，且随着桩帽散粒体压缩模量的增大，土拱效应逐渐加强。②在同一路堤高度下，桩帽顶部的土压力随着散粒体顶部边长的增大而减小，散粒体顶部边长的增大会抑制土拱效应的发挥，而改变桩帽的厚度对土拱效应影响较小。③带散粒体桩帽应用于刚性桩复合地基中对土拱效应的发挥有一定抑制作用。


关键词: 桩帽类型, 带散粒体桩帽, 刚性桩复合地基, 路堤荷载, 土拱效应

Abstract: Laboratory model pile cap tests are performed. The objective of these tests are to investigate the influence of different types of pile caps on the soil arching effect of rigid pile composite foundation, to fully utilize the mechanical properties of rigid pile composite foundation and to improve the bearing capacity and stability of composite foundation. These laboratory model tests are focused on the rigid pile composite foundation under different types of pile caps. The mechanism of soil between piles, pile head pressure, pile load sharing ratio and soil settlement between piles are investigated. The following results are obtained: (1) With the increase of embankment filling height, the soil pressure at the top of pile cap, between piles and the load sharing ratio of pile body increase, and the soil arch effect causes some embankment loads to transfer to pile shaft, and the soil arch effect gradually strengthens with the increase of the compression modulus of the bulk particle of pile cap. (2) under the same embankment height, the soil pressure at the top of the pile cap decreases with the increase of the top side length of the bulk solid, and the increase of the top side length of the bulk solid will inhibit the soil arch effect, while the change of the thickness of the pile cap has a small effect on the soil arch effect. (3) The application of the pile cap with the bulk solid in the rigid pile composite foundation has a certain effect on the soil arch effect.

Key words: Pile Cap Types, Pile Cap with Bulk Solid, Rigid Pile Composite Foundation Cap, Embankment Load, Soil Arching Effect

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