设计、施工、监测

浅覆土大直径盾构管片上浮规律及控制分析

  • 李海滨 ,
  • 余刘成 ,
  • 李明宇 ,
  • 陈健 ,
  • 王越
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  • 1.济南市交通工程质量与安全中心,济南 250102;
    2.郑州大学 土木工程学院,郑州 450001;
    3.中铁十四局集团大盾构工程有限公司,南京 211800;
    4.中国铁建水下隧道工程实验室,济南 250101;
    5.中铁十四局集团有限公司,济南 250101
李海滨(1969—),男,山东平度人,高级工程师,主要从事城市地下工程质量安全监督方面的工作。E-mail:870413618@qq.com
李明宇(1981—),男,黑龙江宁安人,博士,副教授,主要从事地铁隧道工程与复合地基设计理论与施工关键技术研究。E-mail:zzudixia@163.com

收稿日期: 2024-04-24

  网络出版日期: 2025-01-03

基金资助

河南省重点研发与推广专项(科技攻关)项目(202102310586, 232102241011);中国铁建科研开发计划(2018-B05);泰山产业领军人才工程专项经费资助项目(tscx202306015);中铁十四局集团有限公司科技研发计划课题(9137000016305598912021A02)

Analysis of Segment Floating Law and Control Effect of Large Diameter Shield Segment in Shallow Overburden Soil

  • Li Haibin ,
  • Yü Liucheng ,
  • Li Mingyu ,
  • Chen Jian ,
  • Wang Yue
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  • 1. Jinan Traffic Engineering Quality and Safety Center, Jinan 250102, P. R. China;
    2. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, P. R. China;
    3. China Railway 14th Bureau Group Mega Shield Engineering Co., Ltd., Nanjing 211800, P. R. China;
    4. China Railway Construction Underwater Tunnel Engineering Laboratory, Jinan 250101, P. R. China;
    5. China Railway 14th Bureau Group Co., Ltd., Jinan 250101, P. R. China

Received date: 2024-04-24

  Online published: 2025-01-03

摘要

大直径盾构隧道已经广泛应用于各类穿江越河交通工程中,面临的管片上浮问题突出。依托济南黄河隧道工程,分别选取黄河中段、接收段进行管片上浮现场监测,结合室内浆液配比试验,对不同试验段内大直径泥水盾构隧道盾尾管片上浮规律、处理措施作用效果进行了对比分析。结果表明:大直径盾构隧道在埋深2.5D、水压0.4 MPa的粉质黏土地层中掘进时,管片自拼装完毕至上浮稳定的过程大致可分为初始变形(上浮占比22%)、快速上浮(上浮占比55%)、平缓上浮(上浮占比28%)、缓慢沉降(沉降占比5%)4个阶段;在埋深为1.6D、水压为0.2 MPa的区间,各阶段管片高程增量占比各相差3%、8%、-14%、3%,且上浮周期延长2倍;管片上浮的最佳控制时机是开始注浆10 h内,本工程采用的综合措施能够有效控制管片上浮,仅在拱顶区域注浆对管片上浮控制效果最为明显。

本文引用格式

李海滨 , 余刘成 , 李明宇 , 陈健 , 王越 . 浅覆土大直径盾构管片上浮规律及控制分析[J]. 地下空间与工程学报, 2024 , 20(6) : 2000 -2009 . DOI: 10.20174/j.JUSE.2024.06.26

Abstract

Large-diameter shield tunnels have been widely used in various river crossing traffic projects, and the problem of segments upward moving is prominent. Based on the Jinan Yellow River tunnel project, the middle section and the receiving section of the Yellow River were selected for on-site monitoring of segments upward moving, respectively. Combined with the indoor grout proportioning test, a comparative analysis of the law of segments upward moving of large diameter slurry shield tunnel in different test sections and the effect of treatment measures was conducted. The results show that when the large-diameter shield tunnel at the powdery clay formation is driven in the section with a buried depth of 2.5D and water pressure of 0.4 MPa, the process from the completion of segment assembly to uplift stability can be roughly divided into four stages: initial deformation stage (floating accounts for 22%), rapid floating stage (floating accounts for 55%), gentle floating stage (floating accounts for 28%) and slow settlement stage (settlement accounts for 5%); In the section with a buried depth of 1.6D and water pressure of 0.2 MPa, the percentage of segment elevation increments in each stage differed by 3%, 8%, -14%, and 3%, and the uplift period was extended by 2 times; The best time to control the segment uplift is within 10 hours of starting synchronous grouting and the comprehensive measures adopted in the project can effectively control segment uplift. Only grouting in the vault area has the most obvious control effect on segment uplift.

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