土工基础

›› 2015, Vol. 29 ›› Issue (6): 72-74.

• 工程实录 • 上一篇    下一篇

围岩剪胀特性对隧道式锚碇极限承载力的影响

夏国邦1，张水华1，邓 琴2   

  1. (1.云南省公路开发投资有限公司普宣高速公路建设指挥部，昆明 650200；
    2.中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071)
  • 收稿日期:2015-10-13 出版日期:2015-12-22 发布日期:2015-12-30
  • 作者简介:夏国邦（1976-），男，高级工程师,主要研究方向为山区高速公路勘察与设计研究。
  • 基金资助:

    基金项目：云南省交通运输厅科技项目（云交科2011（LH）12-a）资助

Effect of Rock Mass Shear Dilatancy on the Ultimate Axial Capacity of Tunnel Anchorage

XIA Guobang1， ZHANG Shuihua1, DENG Qin2   

  1. (1.  Puxuan Expressway Project Office, Yunan Highway Development & Investment Co. Ltd., Kunming 650200;
    2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071）
  • Received:2015-10-13 Online:2015-12-22 Published:2015-12-30

摘要： 采用有限元超载法计算隧道式锚碇的极限承载力，分析了围岩剪胀特性对计算结果的影响。结果表明，锚碇可调动的围岩范围随围岩剪胀角增大而增大，锚碇承载力随围岩剪胀角的增大而增大。不同的剪胀角取值，得到的极限承载力相差可达一倍，围岩破坏范围也相差一倍。因此，计算隧道式锚碇承载力时，需要合理考虑围岩剪胀特性的影响。

关键词: 剪胀角, 极限承载力, 超载法, 锚碇, 有限元法

Abstract: The effect of the dilatant angle on the ultimate axial uplift capacity of the tunnel anchorage is analyzed by the finite element method (FEM) with overloading. The results indicate that, the anchorage zone of influence in the rock mass increases with the value of the shear dilatant angle. The axial uplift capacity difference could be twice of the magnitude with different shear dialatant angles. It is recommended that the shear dilatancy should be appropriately considered in the estimation of the ultimate axial uplift capacity of the tunnel anchorage.

Key words: Dilatant Angle, Ultimate Axial Uplift Capacity, Overloading, Anchorage, Finite Element Method