[1]宋威,王淑敏,高磊,等.高速铁路桥梁钻孔灌注桩承载特性影响因素研究[J].高速铁路技术,2025,(01):14-20,28.[doi:10.12098/j.issn.1674-8247.2025.01.003]
　SONG Wei WANG Shumin GAO Lei ZHAO Yan.Study on the Factors Affecting the Bearing Characteristics of Bored Piles for High Speed Railway Bridges[J].HIGH SPEED RAILWAY TECHNOLOGY,2025,(01):14-20,28.[doi:10.12098/j.issn.1674-8247.2025.01.003]
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高速铁路桥梁钻孔灌注桩承载特性影响因素研究()
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《高速铁路技术》[ISSN:1674-8247/CN:51-1730/U]

卷:
期数:
2025年01期
页码:
14-20,28
栏目:
理论探索
出版日期:
2025-02-20

文章信息/Info

Title:
Study on the Factors Affecting the Bearing Characteristics of Bored Piles for High Speed Railway Bridges
文章编号:
1674-8247(2025)01-0014-07
作者:
宋威1; 王淑敏1; 高磊2; 赵岩3
(1.中国铁路设计集团有限公司, 天津 300308; 2.河海大学岩土力学与堤坝工程教育部重点实验室, 南京 210024; 3.中铁十二局集团有限公司 太原 030000)
Author(s):
SONG Wei1 WANG Shumin1 GAO Lei2 ZHAO Yan3
(1.China Railway Design Corporation, Tianjin 300308,China; 2.MOE Key Laboratory of Geomechanics and Embankment Engineering, Hohai University, Nanjing 210024,China; 3.China Railway 12th Bureau Group Co., Ltd., Taiyuan 030000,China)
关键词:
钻孔灌注桩;  承载特性;  现场试验;  数值计算;  桩基缺陷
Keywords:
bored pile;  bearing characteristics;  field test;  numerical calculation;  pile foundation defect
分类号:
U24; U443.15
DOI:
10.12098/j.issn.1674-8247.2025.01.003
文献标志码:
A
摘要:
桩身缩径、扩径、桩底沉渣等缺陷严重影响钻孔灌注桩的承载特性,桩基承载能力不足的现象时有发生。本文针对桩基现场试验中出现的承载能力不足问题,通过对成孔质量检测、小应变测试和单桩竖向静载试验结果分析,建立了桩基不同尺寸缩径、扩径和不同桩底沉渣厚度的数值模型,分析钻孔灌注桩承载力不足的原因及其影响因素。研究结果表明:(1)桩身中下部缩径时桩身侧摩阻力提前发挥至极限,并导致轴力在整个桩身内的分布存在巨大差异,造成单桩承载力下降;(2)桩顶扩径加强了桩身顶部的桩-土作用,扩径处与土体的嵌固作用减缓了桩侧摩阻力的发挥,使单桩承载力提高;(3)桩底沉渣对钻孔灌注桩承载能力的削弱主要体现在桩底以上5 m范围内。研究成果可为该地区钻孔灌注桩的施工提供参考。
Abstract:
Defects such as diameter reduction, diameter enlargement, and sediment at the pile bottom severely impact the bearing capacity characteristics of bored piles, leading to frequent occurrences of inadequate bearing capacity. Addressing the issue of inadequate bearing capacity encountered in field tests of pile foundations, this paper analyzed the results of hole-forming quality inspection, low-strain dynamic testing, and vertical static load testing of single piles. Numerical models for piles with different sizes of diameter reduction, diameter enlargement, and varying thicknesses of sediment at the pile bottom were established to investigate the causes and influencing factors of inadequate bearing capacity of bored piles. The research findings indicate that:(1)When there is diameter reduction in the middle to lower part of the pile, the lateral friction resistance of the pile shaft is prematurely exerted to its limit, resulting in significant differences in axial force distribution throughout the pile and a decrease in the bearing capacity of the single pile.(2)Diameter enlargement at the pile top enhances the pile-soil interaction at the top of the pile. The fixation effect between the enlarged section and the soil slows down the development of lateral friction resistance, thus increasing the bearing capacity of the single pile.(3)The weakening effect of sediment at the pile bottom on the bearing capacity of bored piles is mainly manifested within a 5 m range above the pile bottom. The research findings provide a reference for the construction of bored piles in the region.

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备注/Memo

备注/Memo:
收稿日期:2023-06-21
作者简介:宋威(1988-),男,高级工程师。
基金项目:中国铁路设计集团有限公司科技开发课题A类重点课题(2021A230106)
更新日期/Last Update: 2025-02-20