岩土力学 ›› 2018, Vol. 39 ›› Issue (S2): 295-301.doi: 10.16285/j.rsm.2018.1355

• 岩土工程研究 • 上一篇    下一篇

囊式扩体锚杆在宁波地区的现场试验研究

刘 钟1,张楚福2,张 义1,吕美东2,许国平3,陈天雄2   

  1. 1. 中冶建筑研究总院有限公司,北京 100088;2. 浙江坤德创新岩土工程有限公司,浙江 宁波 310000; 3. 宁波市建筑设计研究院有限公司,浙江 宁波 315012
  • 收稿日期:2018-07-21 出版日期:2018-12-21 发布日期:2019-01-06
  • 作者简介:刘钟,男,1950年生,博士,教授级高工,主要从事桩基工程、岩土锚固工程、地基处理等领域的理论与新技术的研究工作。
  • 基金资助:
    财政部施工新技术研究与开发项目(No.财企【2012】171号)

Field test study of under-reamed ground anchorage with capsule in Ningbo area

LIU Zhong1, ZHANG Chu-fu2, ZHANG Yi1, LÜ Mei-dong2, XU Guo-ping3, CHEN Tian-xiong2   

  1. 1. Central Research Institute of Building and Construction of MCC Group, Beijing 100088 China; 2. Zhejiang Kun De Innovate Geotechnical Engineering Co., Ltd., Ningbo, Zhejiang, 310000 China; 3. Ningbo Architectural Design Research Institute Co., Ltd., Ningbo, Zhejiang, 315012 China
  • Received:2018-07-21 Online:2018-12-21 Published:2019-01-06
  • Supported by:
    This work was supported by the Scientific and Technological Project Fund of Ministry of Finance of China (【2012】171).

摘要: 锚杆几何形态对于锚杆承载机制的影响及其在软弱土层中的工作性状一直是岩土锚固工程领域具有争议且亟待解决的问题。采用粗细径比为4.44的扩体锚杆现场足尺试验方法,通过宁波软弱地层的30 m深埋囊式扩体锚杆拉拔试验,获得了一组带有共性的单调上升的锚杆荷载–位移曲线。试验结果表明,深埋扩体锚杆具有卓越的力学特性,位移延性性能也表现出色,即使在大变形区域,锚杆承载力仍然能够持续提升。分析锚杆的荷载–位移曲线、锚杆弹性与塑性变形的试验结果以及对比锚杆极限承载力计算值与试验值,加深了对囊式扩体锚杆独特的应变硬化性状、承载机制和位移控制量值等规律的认识,试验研究结果对大埋深的新型扩体锚杆在宁波地区的推广应用具有指导意义。

关键词: 囊式, 扩体锚杆, 力学性能, 试验研究, 施工方法

Abstract: The geometrical shape effects on the anchorage systems and their mechanical characteristics in weak soils are the controversial issues to be resolved in the anchored structure field. In the full scale field experiments, the 30 m deep under-reamed anchorages with 4.44 diameter ratio of large fixed section to borehole section are investigated; the loading–displacement curves of under-reamed anchorages demonstrated the monotonic rising in common along with increasing displacement. The anchorage test results in weak soil layers show that their excellent mechanical properties and the good ductility as well, namely, the under-reamed ground anchorage can keep higher bearing capacity when it has a larger displacement. Based on the analysis of loading–displacement curves including elastic and plastic deformation, and bearing capacity comparison of measured data and calculated value, it is found that the strain–hardening characteristics peculiar to the bearing and deformation behavior of the deep under-reamed anchorage with capsule, and also the control value of anchorage displacement. Experimental research results can provide the significant instruction for the application of new anchorage system with capsule in Ningbo area.

Key words: capsule, under-reamed anchorage, mechanical property, experimental research, construction method

中图分类号: 

  • TU433
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