›› 2016, Vol. 37 ›› Issue (1): 185-192.doi: 10.16285/j.rsm.2016.01.022

• 岩土工程研究 • 上一篇    下一篇

基于楔形效应的隧道锚抗拔承载能力研究

廖明进1, 2,王全才1,袁从华3,汤 华3,张水华4   

  1. 1. 中国科学院水利部成都山地灾害与环境研究所,四川 成都 610041;2. 武汉科技大学理学院,湖北 武汉 430065; 3. 中国科学院武汉岩土力学研究所,湖北 武汉 430071;4. 云南普宣高速公路建设指挥部,云南 宣威 655400
  • 收稿日期:2013-11-30 出版日期:2016-01-11 发布日期:2018-06-09
  • 作者简介:廖明进,男,1977年生,硕士,讲师,主要从事边坡工程方面的研究工作
  • 基金资助:

    云南省交通运输厅科技项目(No. 云交科2011(LH)12-a)资助

Research on the pull-out capacity of the tunnel-type anchorage based on wedge-effect

LIAO Ming-jin1, 2, WANG Quan-cai1, YUAN Cong-hua3, TANG Hua3, ZHANG Shui-hua4   

  1. 1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences & Water Resources Ministry, Chengdu, Sichuan 610041, China; 2. Wuhan University of Science and Technology, college of science, Wuhan, Hubei 430065, China; 3. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 4. Construction Headquarters of Yunnan Puli-Xuanwu Expressway, Xuanwei, Yunnan 655400, China
  • Received:2013-11-30 Online:2016-01-11 Published:2018-06-09
  • Supported by:

    This work was supported by the Science and Technology Program of Transportation Department of Yunnan Province(2011(LH)12-a).

摘要: 悬索桥隧道锚因楔形体外观特征具备强大的抗拔承载能力。基于匀质围岩假定和Mohr-Coulomb强度准则,研究锚碇围岩系统两种破坏模式即岩锚界面摩擦破坏以及围岩受侧向挤压后产生的破裂,根据岩锚界面受力特点建立界面平衡条件,分析围岩破裂面应力状态的改变,并将其与等截面体的抗拔承载力相比较,分别得到对应两种破坏模式的楔形效应系数,由此推导出两种破坏模式下隧道锚抗拔承载力计算公式。研究结果表明,隧道锚抗拔承载力的楔形效应对于不同类别的围岩表现出明显规律。通过与已建隧道锚承载力的研究结果相比较,验证计算较为吻合,进一步证实了考虑楔形效应的简化公式计算隧道锚承载力的正确性和合理性。

关键词: 隧道锚, 抗拔承载力, 楔形效应, 摩尔-库仑准则, 摩擦

Abstract: Generally, the tunnel-type anchorage in the suspension bridge has a strong capacity to resist the uplift load due to the appearance of the wedge. In this study, two failure modes, i.e. friction damage on the anchor interface and the surrounding rock rupture owing to lateral extrusion, are investigated based on the assumption of homogeneous surrounding rock and Mohr-Coulomb strength criterion. According to the distribution of the force on interface between anchors and rock, the equilibrium conditions are established to further analyze the change of stress on rupture surface within the surrounding rocks. Besides, the wedge-effect coefficients of the tunnel-type anchorage with respect to two failure modes are derived, comparing with the pull-out capacity of the anchorage with constant section. Subsequently, the formulations about the pull-out bearing capacity of tunnel-type anchorage are obtained under these two failure modes. Research results show that the wedge-effect on the pull-out bearing capacity of the tunnel-type anchorage has obvious regularities for different classes of surrounding rock. Finally, the calculated results by the proposed procedure are compared with measured values of the built tunnel-type anchorage. It is shown that the proposed procedure is reasonable to consider the wedge-effect for the bearing capacity of the tunnel-type anchorage.

Key words: tunnel-type anchorage, pullout capacity, wedge-effect, Mohr-Coulomb criterion, friction

中图分类号: 

  • TU 473.1

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