土工基础

土工基础 ›› 2020, Vol. 34 ›› Issue (5): 554-559.

• 工程实录 • 上一篇    下一篇

盾构超近距离下穿既有隧道变形控制研究

付春青1，高玉春1，颜 静2，刘 维2   

  1. （1.北京住总集团有限责任公司，北京 100101；2.苏州大学 轨道交通学院，江苏苏州 215000）
  • 收稿日期:2020-06-01 修回日期:2020-06-19 出版日期:2020-10-20 发布日期:2020-11-02
  • 作者简介:付春青（1978-），男，博士，研究方向为岩土工程、隧道与地下工程。
  • 基金资助:
    国家自然科学基金（51978430）；北京住总集团科研项目（QTZC-2019-019）

Deformation Control of Existing Tunnel Induced by Undercrossing Shield Tunnel at Small Distance

FU Chunqing1, GAO Yuchun1, YAN Jing2,  LIU Wei2   

  1. (1.Beijing Uni.Construction Group Co. Ltd., Beijing 1000101;
    2.School of Rail Transportation, Soochow University, Suzhou 215000)
  • Received:2020-06-01 Revised:2020-06-19 Online:2020-10-20 Published:2020-11-02

摘要： 盾构隧道施工中采用同步注浆来控制地层沉降，以北京地铁12号线下穿10号线工程为背景，研究了近距离条件下既有隧道变形控制。研究基于注浆材料固结变形特性，提出了同步注浆控制下盾尾间隙引起的地层变形预测方法；在此基础上，采用数值仿真对下穿既有隧道工程进行模拟，分析既有隧道变形规律，并与理论结果进行对比。研究结果表明：在仅采用同步注浆控制措施，既有隧道最大沉降值为-4.08 mm，大于变形控制值，无法保障既有隧道的安全运营。基于变形预测，提出现场土体加固、设置隔离环等控制措施，减小既有隧道变形。


关键词: 盾构下穿, 同步注浆, 盾构间隙, 变形控制

Abstract: Synchronous grouting is usually adopted to control the ground settlement during the shielded tunnel excavations. Based on the project of Metro Line No.12 beneath the Line 10 in Beijing, this paper investigates the deformation control of a tunnel excavation close to an existing tunnel. Based on the consolidation deformation characteristics of the synchronous grouting material, a method for predicting the deformation induced by the gap at the end of shielding under the synchronous grouting is proposed. The numerical simulation was used to analyze the deformation of the existing tunnel. The results indicate that, the maximum settlement of existing tunnel was -4.08 mm, which was greater than the control value. The measured deformation suggested that the synchronous grouting alone could not guarantee the safe operation of the existing tunnel. Upon deformation prediction, methods of onsite soil reinforcement and isolation zones were adopted to reduce deformation of existing tunnels.

Key words: Shielded Tunnel Undercrossing, Synchronous Grouting, Gap at the End of Shielding, Deformation Control

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