大断面平顶直墙暗挖通道下穿地铁变形控制研究
摘要:大断面平顶直墙暗挖通道下穿在运营地铁结构施工时,因开挖形状不利于成拱、地铁运营要求高等特点,对变形控制提出了极高的要求和挑战。基于五棵松地下停车库工程—地下通道—中间人行通道下穿地铁1号线工程,分析了通道下穿既有地铁结构变形规律,提出了控制既有结构变形的相关理念和措施,通过采取超前深孔注浆、初支二衬多次受力转换、动态注浆顶升、既有结构变位分配控制等措施,成功地将既有地铁结构变形控制在3 mm以内,确保了地铁的结构安全与运营安全。表明了增大弹性地基梁刚度、既有结构变位分配控制理念及上述相关措施,可以有效地控制大断面平顶直墙通道下穿施工中既有结构的变形,为后续类似工程提供借鉴和参考。
Abstract:Limited by the shape of the excavation which cannot form an effective arch, there are extremely high requirements for deformation control during the tunneling of large section flat-top straight wall section tunnel. Through the Wukesong underground parking garage-underpass-intermediate pedestrian passage under the subway line 1 project, the deformation law of the tunnel under the existing subway structure is analyzed, and relevant concepts and measures to control the existing structural deformation are proposed. Measures are adopted to control the deformation, such as advanced deep hole grouting, multiple support of primary lining, dynamic grouting, and structural displacement control. The deformation of existing subway structures was successfully controlled within 3 mm, ensuring the structural safety and operational safety of subway. The increase of the stiffness of the elastic foundation beam, the control concept of the existing structural displacement distribution and the above-mentioned related measures can effectively control the deformation of the existing structure during the construction of the large section flat-top straight wall tunnel, and provide reference for similar projects.
中文标题：
大断面平顶直墙暗挖通道下穿地铁变形控制研究
Deformation Control Measures of Underground Tunnel under the Tunneling of Large Section and Straight Wall
作者：
李贺1,李菲2,李雨株3
Li He1,Li Fei2,Li Yuzhu3
作者简介:李贺,男,1987年生,吉林松原人,硕士研究生,工程师,主要从事地下结构、通道结构设计和研究工作。E-mail:277238791@qq.com
通讯地址：
1. 北京城建设计发展集团股份有限公司, 北京 100037; 2. 北京城市副中心投资建设集团有限公司, 北京 100029; 3. 中兵勘察设计研究院有限公司, 北京 100053
1.BeijingUrbanConstructionDesign&DevelopmentGroupCo.,Ltd.,Beijing100037,China; 2.BeijingInvestmentGroupCo.,Ltd.,Beijing100029,China; 3.ChinaOrdnanceIndustrySurveyandGeotechnicalInstituteCo.,Ltd.,Beijing100053,China
中图分类号:P632
doi:10.3969/j.issn.1007-2993.2020.05.005
出版物：岩土工程技术
收稿日期:2019-12-09
网络出版日期:2021-07-06
关键词:下穿施工,大断面,平顶直墙,变形控制措施
Key words:under construction,large section,flat-top straight wall,deformation control measures
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