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山东大学学报 (工学版) ›› 2021, Vol. 51 ›› Issue (1): 24-31.doi: 10.6040/j.issn.1672-3961.0.2020.265

• 土木工程 • 上一篇    下一篇

砂土中浅埋竖向锚定板极限承载力

宋修广1(),杨鹤1,陈晓燕2,崔文杰1,岳红亚1,*(),张恺3,田隽4   

  1. 1. 山东大学齐鲁交通学院, 山东 济南 250002
    2. 济南市邢家渡引黄灌溉管理处, 山东 济南 250100
    3. 济南新旧动能转换先行区管理委员会建设管理部, 山东 济南 250101
    4. 山东高速股份有限公司投资部, 山东 济南 250101
  • 收稿日期:2020-07-03 出版日期:2021-02-20 发布日期:2021-03-01
  • 通讯作者: 岳红亚 E-mail:songxiuguang@sdu.edu.cn;yuehongya@mail.sdu.edu.cn
  • 作者简介:宋修广，1966年8月出生，工学博士，教授，博士生导师，山东省路基安全工程技术中心主任。主要从事道路病害机理及加固技术、工程灾害防治等领域的研究。主持国家及省部级项目10余项，企事业委托的重大工程项目20余项；获国家科技进步二等奖1项，省部级科技进步奖6项；发表学术论文100余篇(SCI及EI收录30余篇)，获国家发明专利40余项；编写专著2部，国标1部，地方标准4部。宋修广(1966—)，男，山东威海人，教授, 博士，主要研究方向为岩土支档结构, 地基加固技术. E-mail: songxiuguang@sdu.edu.cn

Ultimate uplift capacity of shallow vertical plate anchors in sand

Xiuguang SONG1(),He YANG1,Xiaoyan CHEN2,Wenjie CUI1,Hongya YUE1,*(),Kai ZHANG3,Juan TIAN4   

  1. 1. School of Qilu Transportation, Shandong University, Jinan 250002, Shandong, China
    2. Jinan Xingjiadu Yellow River Diversion Irrigation Management Office, Jinan 250100, Shandong, China
    3. Construction Management Department, Jinan Pilot Zone Management Committee, Jinan 250101, Shandong, China
    4. Investment Department, Shandong Express Group Co., Ltd., Jinan 250101, Shandong, China
  • Received:2020-07-03 Online:2021-02-20 Published:2021-03-01
  • Contact: Hongya YUE E-mail:songxiuguang@sdu.edu.cn;yuehongya@mail.sdu.edu.cn

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摘要：

研究砂土中浅埋竖向锚定板的极限承载力。采用粒子图像测速法(particle image velocimetry, PIV)开展模型试验研究, 得到砂土中竖向锚定板在水平拉拔过程中的土体变形和破坏机理。采用有限元极限分析给出不同土体参数和埋深比时砂土中浅埋竖向锚定板承载力上下限解。基于观测到的土体破坏形式, 依据极限平衡理论构建浅埋竖向锚定板极限承载力计算模型, 推导条形锚定板极限承载力计算公式, 进而通过引入形状系数建立矩形锚定板承载力计算方法。与极限分析上下限解对比显示, 该解接近于锚定板承载力下限解。采用51组模型试验数据, 对新建计算方法进行验证分析。对比结果显示, 理论预估高于试验数据约5%, 与试验数据吻合较好。研究结果的取得可对锚定板类支撑结构承载力设计计算提供一定的理论参考依据。

关键词: 竖向锚定板, 破坏机理, 承载力, 极限平衡, 有限元极限分析

Abstract:

This paper investigated the pullout behaviour of shallow vertical plate anchors in sand. Pull-out model tests were performed using the particle image velocimetry (PIV) technology, by which the soil deformation and failure mechanisms were observed. Then the ultimate bearing capacity of vertical plate anchors at various soil properties and cover depths was simulated using the finite element limit analysis software. According to the observed failure mechanism, a limit equilibrium solution was developed to calculate the bearing capacity of shallow strip plate anchors in sand, which was then extended for the prediction of the ultimate bearing capacity of rectangle plate anchors by introducing a shape coefficient. Results predicted by the new limit equilibrium solution showed close agreement with those by the lower bound limit analysis solution. The limit equilibrium solution was compared with 51 experimental data, which showed an average of 5% overestimation of the ultimate bearing capacity. This research can provide a theoretical method for the calculation of the ultimate bearing capacity of shallow plate anchors in sand.

Key words: vertical plate anchor, failure mechanism, capacity, limit equilibrium, finite element limit analysis

中图分类号: 

  • TU476

图1

试验装置示意图"

图2

典型竖向锚定板荷载-位移曲线"

图3

破坏时刻土体剪应变和累积速度矢量"

图4

计算模型对比验证"

图5

模型试验与弹塑性分析破坏模式对比"

图6

极限平衡力学模型"

图7

极限平衡解与上下限解对比"

表1

砂土中竖向锚定板试验汇总"

数据来源 试验数量 L/h 锚定板材料 密实度 H/h φ/(°) φin/(°) Cf
文献[29] 10 1 钢板/木板/混凝土/玻璃 压实处理 2 34/36 0.5φ/0 0.42
文献[30] 9 1 铝板 密砂/松砂 2~7 31/34/40.5 0.5φ 0.42/0.26
文献[17-19, 24] 15 1~5/条形 铝板 69.70% 1~8 41[14] 29 0.42
文献[24-25] 9 1~5 钢板 压实处理 1.7~7.7 43.6 10.6 0.42
文献[15] 6 1 钢板 30%/50%/75% 1~5 32/35/39 0.5 φ 0.42/0.26
本研究试验 2 条形 钢板 50%/83% 1~7 36.6/40.3 0.56~0.99 φ —

图8

极限平衡解计算值与试验数据对比"

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