长江科学院院报 ›› 2017, Vol. 34 ›› Issue (6): 119-123.DOI: 10.11988/ckyyb.20160195

• 岩土工程 • 上一篇    下一篇

被动区土体加固对深基坑变形影响的研究

康志军1a,1b,谭勇1a,1b,邓刚2,卫彬3   

  1. 1.同济大学a.地下建筑与工程系;b.岩土及地下工程教育部重点实验室,上海 200092;
    2.四川省交通运输厅公路规划勘察设计研究院,成都 611130;
    3.中铁二院工程集团有限责任公司 华东勘察设计有限责任公司,上海 200023
  • 收稿日期:2016-03-08 修回日期:2016-04-21 出版日期:2017-06-01 发布日期:2017-06-19
  • 作者简介:康志军(1991-),男,四川凉山人,硕士研究生,主要从事基坑工程与隧道工程的设计和研究,(电话)18801790817(电子信箱)demfemgeo@163.com。
  • 基金资助:
    国家“973”重点基础研究发展计划资助项目(2015CB057800)

Impact of Soil Reinforcement in Passive Zone on the Deformation Behaviors of Deep Excavation

KANG Zhi-jun1,2, TAN Yong1,2, DENG Gang3, WEI Bin4   

  1. 1.Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;
    2.Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;
    3.Highway Planning, Survey, Design and Research Institute, Department of Transport of Sichuan Province, Chengdu 611130, China;
    4.East China Survey and Design Company Limited, China Railway Eryuan Engineering Group, Shanghai 200023, China
  • Received:2016-03-08 Revised:2016-04-21 Online:2017-06-01 Published:2017-06-19

摘要: 被动区土体加固能有效地控制基坑开挖引起的变形、保护基坑周边环境,在实际工程中得到广泛的应用。对上海软土地区某地铁车站深基坑工程进行数值模拟,系统地研究了不同土体加固形式对基坑变形的影响。研究结果表明该工程采取的坑底加固措施使得基坑变形满足变形控制标准;增大土体加固的深度能显著地减小围护结构侧向位移、地表沉降和坑底隆起;而过度地增大加固土体的割线模量E50ref对控制基坑变形的效果甚微;在同等条件下,满堂加固控制基坑变形的能力明显优于裙边加固。

关键词: 软土地区, 深基坑, 被动区土体加固, 基坑变形, 割线模量, 满堂加固, 裙边加固

Abstract: The deformation behaviors of deep excavation and its adverse impact on surrounding environment could be effectively controlled by reinforcement in the passive zone which is widely applied in actual projects. With a deep excavation for the metro station in Shanghai soft soil area as research background, the impact of reinforcement in passive zone on excavation-induced deformation was investigated by numerical simulations. Results showed that by reinforcement in passive zone, the magnitude of deformations could meet control requirements. With the increase of reinforced depth, deformations such as lateral wall deflection, ground settlement and bottom upheaval could be effectively controlled; but excessive improvement on the magnitude of E50ref for reinforced soil had little impact. The effect of controlling excavation deformation by reinforcement of entire basal soil is obviously superior to that by reinforcement along the diaphragm wall under equal condition.

Key words: soft soil, deep excavation, soil reinforcement in passive zone, excavation deformation, secant modulus, reinforcement of entire basal soil, reinforcement along diaphragm wall

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