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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

41卷

期数:

2024年06期

页码:

171-181

栏目:

岩土工程

出版日期:

2024-11-30

文章信息/Info

Title:

Numerical study of ultimate anti-sliding force of multi-row micro anti-slide piles

文章编号:

1673-2049(2024)06-0171-11

作者:

吴泽雄¹,雷国平²,张院生³,苏 栋^4,5,杨伟鸿⁴,马 华³,程马遥²

(1. 中山大学 土木工程学院,广东 珠海 519082; 2. 佛山大学 土木与交通学院,广东 佛山 528225; 3. 铁科院(深圳)研究设计院有限公司,广东 深圳 518060; 4. 深圳大学 土木与交通工程学院,广东 深圳 518052; 5. 深圳大学 未来地下城市研究院,广东 深圳 518052)

Author(s):

WU Zexiong¹, LEI Guoping², ZHANG Yuansheng³, SU Dong^4,5, YANG Weihong⁴, MA Hua³, CHENG Mayao²

关键词:

微型抗滑桩;  多排桩;  弯曲破坏;  极限抗滑力;  桩排距

Keywords:

micro anti-slide pile;  multi-row pile;  bending failure;  ultimate anti-sliding force;  pile row spacing

分类号:

TU473

DOI:

10.19815/j.jace.2022.12079

文献标志码:

A

摘要:

对多排微型桩群在土体水平位移作用下的响应开展数值模拟研究,微型桩的建模充分考虑了其塑性变形的特性,并通过对已有的桩抗弯试验建立精细化有限元模型获得了桩体参数。在分析微型抗滑桩响应的基础上,推导了适用于微型抗滑桩的简化极限抗滑力计算公式,研究了微型桩排距和滑动面摩擦因数的影响。结果表明:多排桩能调动相对单排桩更大深度范围的桩土相互作用,结构整体刚度更高,但同时群桩效应降低了桩土相互作用力,多排桩中单桩抗滑力仅为单排桩情况下的50%～70%; 滑动面摩擦因数对多排桩的影响大于单排桩,增加该系数明显降低了桩土相互作用力,提高了桩的影响深度范围,导致抗滑力降低; 增大排距可整体上提高多排微型桩的抗滑力,当排距小于7倍桩径时,增大排距主要降低了桩的影响深度范围,而当排距大于7倍桩径时,则主要是通过改变桩土相互作用力的分布来增加抗滑力; 所提出的桩抗滑承载力计算公式较好地反映了微型桩的受力特征,具有进一步研究和推广的价值。

Abstract:

A numerical simulation study was carried out on the response of a multi-row micro-pile group subjected to soil lateral displacement. The plastic deformation characteristics of micro-pile was considered in the numerical model, and the pile parameters were obtained by performing a refined finite element model against some published pile bending tests. Based on the analysis of the micro anti-slide pile response, a simplified formula for calculating the ultimate anti-sliding force was deduced. The influence of the row spacing and the friction coefficient of slip surface were studied. The results show that in the multi-row case, the pile-soil interaction is mobilized in a larger depth range than the case of a single row of piles, and the overall stiffness of structure is higher. However, the pile group effect reduces the pile-soil interaction force. As a result, the anti-sliding force of a single pile in the multi-row structure is only 50%-70% of that of the case of a single-row. The influence of the slip surface friction coefficient is greater on multi-row piles than on single-row piles. Increasing friction coefficient significantly reduces the pile-soil interaction force and increases the pile influencing depth range, which result in the reduction of anti-sliding force of pile. Increasing the row spacing can improve the overall resistance of the multi-row micro-pile structure. When the row spacing is less than 7 times of pile diameter, increasing the row spacing mainly reduces the pile influencing depth range. While the sliding resistance is mainly increased by the variation of the pile-soil interaction force distribution when the row spacing is greater than 7 times of pile diameter. The proposed calculation formula of the bearing capacity of anti-sliding pile can well reflect the force characteristics of the micro-pile, which is worth to be further researched and promoted.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2023-11-01 投稿网址:http://jace.chd.edu.cn
基金项目:中国铁道科学研究院集团有限公司基金项目(2019YJ180); 深圳市自然科学基金项目(JCYJ20210324094607020); 国家自然科学基金项目(51878416); 广东省自然科学基金项目(2023A1515011772);佛山市教育局高校教师创新项目(2021XJZZ10)
作者简介:吴泽雄(1996-),男,工学博士研究生,E-mail:zexiong.wu96@foxmail.com。
通信作者:雷国平(1989-),男,工学博士,讲师,E-mail:guoping.lei@foxmail.com。
Author resumes: WU Zexiong(1996-),male,doctoral student,E-mail:zexiong.wu96@foxmail.com; LEI Guoping(1989-),male,PhD,assistant professor,E-mail:guoping.lei@foxmail.com.

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更新日期/Last Update: 2024-12-10