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隧道与地下工程灾害防治  2019, Vol. 1 Issue (1): 119-126    
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
深基坑隔离桩对坑外既有隧道保护效果分析
徐长节1,朱怀龙1,龙莉波2,蒋亚龙1,胡琦3
1. 华东交通大学江西省岩土工程基础设施安全与控制重点实验室, 江西 南昌 330013;2. 上海建工二建集团有限公司, 上海 200080;3. 杭州东通岩土科技有限公司, 浙江 杭州 310020
Protection effect analysis of isolated piles for deep foundation pit on existing tunnel outside the pit
XU Changjie1, ZHU Huailong1, LONG Libo2, JIANG Yalong1, HU Qi3
Protection effect analysis of isolated piles for deep foundation pit onexisting tunnel outside the pitXU Changjie1, ZHU Huailong1, LONG Libo2, JIANG Yalong1, HU Qi3(1. Jiangxi key laboratory of infrastructure safety control in geotechnical engineering, East China Jiaotong University, Nanchang 330013, Jiangxi, China;
2. Shanghai Jiangong Second Constrution Group Co., Ltd, Shanghai 200080, China;
3. Hangzhou Dongtong Geotechnical Technology Co., Ltd, Hangzhou 310020, Zhejiang, China
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摘要 依托南昌市某深基坑开挖时采用隔离桩保护临近既有地铁隧道工程,采用ABAQUS有限元数值建模并结合实测数据,研究隔离桩在基坑开挖时对坑外既有地铁隧道的保护效果。通过建立多组有限元模型,研究基坑开挖时隔离桩在不同水平位置和不同桩顶埋深条件下既有隧道衬砌内力、直径变形情况。研究结果表明:隔离桩水平位置对隧道衬砌的内力影响较为明显,隔离桩离隧道越近,隔离桩对既有隧道的保护效果越好;设置隔离桩能明显减小既有隧道衬砌的变形,且隔离桩对其竖向变形影响小于对其水平变形的影响;埋入式隔离桩隔离效果在一定程度上优于非埋入式隔离桩,在实际工程中可以采用埋入式隔离桩,适当减小桩身长度,降低工程造价。
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徐长节
朱怀龙
龙莉波
蒋亚龙
胡琦
关键词:  隔离桩  深基坑开挖  地铁隧道  现场实测  数值模拟    
Abstract: The isolated pile technique was adopted in a practical foundation project in Nanchang. Based on this project, numerical modeling simulations built with ABAQUS were combined with the observed data to study the protection effect of isolated piles on adjacent subway tunnel when the foundation pit was proceeded. The influences of horizontal location as well as buried depth of the isolated piles on internal stress and diameter variation of lining in existing tunnel during excavation were studied, based on the analysis on several sets of numerical models. A significant influence of the horizontal location on internal stress of the lining has been observed, a shorten gap of the isolated piles to the tunnel implied an improved protection effect. In addition, the deformation of the lining could be greatly suppressed by setting the isolated piles and more prominent effect on horizontal deformation compared with that on vertical direction. A further analysis indicated that the buried isolated piles performed better than the exposed ones. In general, the buried isolated piles with shortened pile length could be used in practical engineering to reduce the project cost.
Key words:  isolated pile    deep foundation pit excavation    subway tunnel    field measurement    numerical simulation
收稿日期:  2018-12-15                     发布日期:  2019-02-22      期的出版日期:  2019-01-20
中图分类号:  TU921  
基金资助: 国家自然科学基金资助项目(2002017065)
作者简介:  徐长节(1972— ),男,安徽潜山人,博士,教授,博士生导师,长江学者特聘教授,主要研究方向为基坑与隧道工程及土动力学. E-mail: Xucj@zju.edu.cn
引用本文:    
徐长节,朱怀龙,龙莉波,蒋亚龙,胡琦. 深基坑隔离桩对坑外既有隧道保护效果分析[J]. 隧道与地下工程灾害防治, 2019, 1(1): 119-126.
XU Changjie, ZHU Huailong, LONG Libo, JIANG Yalong, HU Qi. Protection effect analysis of isolated piles for deep foundation pit on existing tunnel outside the pit. Hazard Control in Tunnelling and Underground Engineering, 2019, 1(1): 119-126.
链接本文:  
http://tunnel.sdujournals.com/CN/Y2019/V1/I1/119
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