土岩“二元基坑”吊脚桩支护体系锁脚锚杆预加轴力计算方法研究

doi:10.3973/j.issn.2096-4498.2020.10.007

隧道建设（中英文） ›› 2020, Vol. 40 ›› Issue (10): 1441-1447.DOI: 10.3973/j.issn.2096-4498.2020.10.007

土岩“二元基坑”吊脚桩支护体系锁脚锚杆预加轴力计算方法研究

陈诚¹, 杨红林²

（1. 广州地铁设计研究院股份有限公司，广东广州 510010；2. 上海市隧道工程轨道交通设计研究院，上海 200292）

出版日期:2020-10-20 发布日期:2020-10-31
作者简介:陈诚（1990—），男，安徽安庆人，2016年毕业于山东大学，建筑与土木工程专业，硕士，工程师，现从事轨道交通车站结构设计工作。E-mail: chenchengsdu@163.com。
基金资助:
中国博士后科学基金面上项目（2019M652383）；重庆市教委科学技术研究项目（KJ1712304）；长江师范学院校级项目(2016XJQN13)

Study on Calculation Method of Preloaded Axial Force of Footlock Anchor in Support System of Soil and Rock Dualistic Foundation Pit EndSuspended Pile

CHEN Cheng¹, YANG Honglin²

(1.Guangzhou Metro Design & Research Institute Co., Ltd., Guangzhou 510010, Guangdong, China; 2. Shanghai Tunnel Engineering & Rail Transit Design and Research Institute, Shanghai 200292, China)

Online:2020-10-20 Published:2020-10-31

摘要/Abstract

摘要： 为解决土岩二元基坑吊脚桩支护体系中吊脚桩、岩肩与锁脚锚杆之间的相互作用力学机制，根据吊脚桩桩底位于岩质边坡潜在滑动面的位置，分别提出锁脚锚杆预加轴力的计算方法： 1)当吊脚桩位于潜在滑动面以下位置时，锁脚锚杆的预加轴力等于岩层基坑未开挖时的被动区合力减去岩肩能提供的反力； 2)当吊脚桩位于潜在滑动面以上位置时，锁脚锚杆的预加轴力等于滑块对吊脚桩嵌固段的推力加上岩层基坑未开挖前被动区的土压力。并给出2种工况下锁脚锚杆预加轴力的计算公式。最后通过有限元方法进行数值验证。结果表明：按照提出的计算方法得到的锁脚锚杆预加轴力基本合理。

关键词: 吊脚桩, 锁脚锚杆, 预加轴力, 二元基坑

Abstract: The interaction mechanics among the endsuspended pile, rock shoulder and footlock anchor should be studied. Hence, the calculation methods of preloaded axial force of the footlock anchor are proposed based on the positions of endsuspended pile at the bottom of potential sliding surface of rock slope. When the endsuspended pile is located below the potential sliding surface, the preloaded axial force of footlock anchor is equal to the passive zone combined force minus rock shoulder reaction force when the rock foundation pit is not excavated. When the endsuspended pile is above the potential sliding surface, the preloading axial force of footlock anchor is equal to the passive zone combined force plus the thrust of endsuspended pile when the rock foundation pit is not excavated. And the calculation formulas of the preloaded axial force of footlock anchor under two conditions are given. Finally, the results are verified by the finite element method. The results show that the calculation results of the preloaded axial force of footlock anchor according to the calculation methods are basically rational.

Key words: endsuspended pile, footlock anchor, preloaded axial force, dualistic foundation pit

中图分类号:

U 45

陈诚, 杨红林. 土岩“二元基坑”吊脚桩支护体系锁脚锚杆预加轴力计算方法研究[J]. 隧道建设, 2020, 40(10): 1441-1447.

CHEN Cheng, YANG Honglin. Study on Calculation Method of Preloaded Axial Force of Footlock Anchor in Support System of Soil and Rock Dualistic Foundation Pit EndSuspended Pile[J]. Tunnel Construction, 2020, 40(10): 1441-1447.

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[2]	田海光. 土岩组合地层盖挖法车站“吊脚桩”基坑设计优化研究[J]. 隧道建设, 2015, 35(7): 635-641.
[3]	赵文强. 上软下硬复合地层条件下深基坑支护设计探析[J]. 隧道建设, 2014, 34(2): 153-157.

土岩“二元基坑”吊脚桩支护体系锁脚锚杆预加轴力计算方法研究

Study on Calculation Method of Preloaded Axial Force of Footlock Anchor in Support System of Soil and Rock Dualistic Foundation Pit EndSuspended Pile

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