中国安全科学学报 ›› 2024, Vol. 34 ›› Issue (6): 109-118.doi: 10.16265/j.cnki.issn1003-3033.2024.06.0081

• 安全工程技术 • 上一篇    下一篇

循环荷载作用下抗浮多铃型扩体锚杆拔出模型试验

陈晨1(), 余捷1, 刘哲1, 谢莎莎1,**(), 易程程2   

  1. 1 武汉工程大学 土木工程与建筑学院,湖北 武汉 430070
    2 武汉天创建设集团有限公司,湖北 武汉 430050
  • 收稿日期:2023-12-17 修回日期:2024-03-19 出版日期:2024-06-28
  • 通讯作者:
    **谢莎莎(1983—),女,湖北武汉人,博士,副教授,硕士生导师,主要从事施工工艺优化研究。E-mail:
  • 作者简介:

    陈 晨 (1984—)男,湖北武汉人,博士,副教授,硕士生导师,主要从事地面与地下工程、岩土锚固工程方面的研究。E-mail:

  • 基金资助:
    国家自然科学基金面上项目资助(52174085); 教育部磷资源开发利用工程中心、湖北省中低品位磷矿开发利用协同创新中心创新基金资助(LCX2021009); 武汉工程大学研究生创新基金资助(CX2022167)

Pull-out model test of anti-floating multi-bell-shaped anchor under cyclic loading

CHEN Chen1(), YU Jie1, LIU Zhe1, XIE Shasha1,**(), YI Chengcheng2   

  1. 1 College of Civil Engineering and Architecture, Wuhan University of Engineering, Wuhan Hubei 430070, China
    2 Wuhan Tianchuang Construction Group Co., Ltd., Wuhan Hubei 430050, China
  • Received:2023-12-17 Revised:2024-03-19 Published:2024-06-28

摘要:

为研究地下水位变动导致锚杆抗拔性能劣化的原因,提高扩体锚杆在抗浮过程中的锚固性能,首先,通过单次拉拔试验,得出不同埋深情况下多铃型扩体锚杆拔出过程中承载性能的变化情况;然后,根据单次拉拔试验得出的抗拔极限承载力进行循环试验,在不同循环荷载比、循环次数和循环频率下,探索多铃型扩体锚杆承载性能演化机制;最后,利用图像粒子测速法(PIV)分析周围土体变形机制,得出单次拉拔及循环荷载作用下周围土体位移的变化特性。结果表明:铃型扩体锚杆拔出过程中轴力-位移曲线大致分为弹性、震荡和破坏3个阶段,且随着埋深增加,锚杆的抗拔极限承载力和土体位移逐步递增;在循环荷载作用下,增加循环荷载比、循环次数以及循环频率均会降低锚杆锚固性能。

关键词: 循环荷载, 抗浮, 多铃型扩体锚杆, 锚杆拨出, 承载力, 土体位移

Abstract:

In order to study the reasons for the deterioration of the anchor performance caused by groundwater variation, a series of physical model tests were employed to explore the anchorage enhancement of the expanded anchor in the anti-floating process. Firstly, a single pull-out test was carried out through the indoor model test, and the change of bearing capacity of multi-bell-shaped expanded anchor under different buried depths during the pull-out process was obtained. Secondly, according to the ultimate uplift bearing capacity obtained from the single pull-out test, the cyclic test was carried out to explore the evolution mechanism of the bearing performance of the multi-bell-shaped expanded anchor under different cyclic amplitudes, cyclic times and cyclic frequencies. Finally, the image particle velocity method (PIV) was used to analyze the deformation mechanism of the surrounding soil, and the variation characteristics of the surrounding soil displacement under single pulling-out and cyclic loading were obtained. The test results show that the axial load-displacement curve of the bell-shaped expansion anchor can be roughly divided into three stages: elasticity, vibration and failure. With the increase of buried depth, the ultimate bearing capacity and soil displacement of the anchor increase. Under the action of cyclic loadings, the increase of the cyclic load ratio, the number of cycles and the cycle frequency will weaken the bearing capacity of the anchors.

Key words: cyclic load, anti-floating, multi-bell-shaped expanded anchor, anchor pull-out, bearing capacity, soil displacement

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