东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (3): 426-430.DOI: 10.12068/j.issn.1005-3026.2018.03.024

• 资源与土木工程 • 上一篇    下一篇

局部锚固失效下桩锚支护体系深基坑力学响应分析

韩健勇， 赵文， 贾鹏蛟， 陈阳   

  1. (东北大学 资源与土木工程学院， 辽宁 沈阳110819)
  • 收稿日期:2016-11-28 修回日期:2016-11-28 出版日期:2018-03-15 发布日期:2018-03-09
  • 通讯作者: 韩健勇
  • 作者简介:冯明杰(1971-)， 男， 河南禹州人， 东北大学副教授; 王恩刚(1962-)， 男， 辽宁沈阳人， 东北大学教授，博士生导师.韩健勇(1990-)，男，山东德州人，东北大学博士研究生; 赵文(1962-)，男，内蒙古乌兰察布人，东北大学教授，博士生导师．
  • 基金资助:
    国家自然科学基金资助项目(51171041).国家自然科学基金资助项目(51578116).

Mechanical Response of Anchored Pile Supporting Deep Excavation Influenced by Local Anchor Failure

HAN Jian-yong， ZHAO Wen， JIA Peng-jiao， CHEN Yang   

  1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.
  • Received:2016-11-28 Revised:2016-11-28 Online:2018-03-15 Published:2018-03-09
  • Contact: ZHAO Wen
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摘要： 以某砂土层桩锚支护结构深基坑为工程背景，基于有限元程序Plaxis建立数值计算模型，对单排锚索失效、双排锚索失效两种局部锚固失效工况分别进行模拟，研究了预应力锚固失效引起的支护结构力学响应规律，揭示了锚固失效后的锚索荷载传递规律.研究表明:相对于单排锚索失效情况，双排锚索失效对基坑支护结构变形及内力的影响较大;在群锚失效最不利工况下，桩体最大弯矩和位移分别为正常工况时的1.66倍和1.74倍;桩体弯矩增大倍数是决定桩体是否发生破坏的重要指标.

关键词: 桩锚支护, 锚固失效, 力学响应, 荷载传递, 基坑稳定性, 深基坑

Abstract: Under the engineering background of anchored pile supporting excavation in sand layers， numerical models were established using the FEM program Plaxis to simulate excavations under two local anchor failure conditions of one-row and two-row anchor cable failures. The effect of prestressed anchor failures on mechanical response of retaining structures was studied. Besides， the load transfer response to the anchor failures was revealed. The results obtained from the numerical simulations show that the influence of two-row anchor cable failure on deformation and internal force of retaining structure was larger than that of one-row anchor cable failure. Under the most unfavorable condition of group anchor failures， the bending moments and displacements of retaining piles were 1.66 and 1.74 times of those under the normal construction condition， respectively， and the increase ratio of the bending moment of the retaining piles was the crucial determining factor of the piles failure.

Key words: anchored pile supporting, anchor failure, mechanical response, load transfer, excavation stability, deep excavation

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