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Settlement characteristics of large-diameter shield excavation below existing subway in close vicinity

大直径盾构隧道紧邻下穿既有地铁施工诱发地层沉降特征分析

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Abstract

A case of Qinghuayuan tunnel excavation below the existing Bei**g Subway Line 10 is presented. The new Qinghuayuan tunnel, part of the Bei**g-Zhangjiakou High-speed Railway, was excavated by a shield machine with an outer diameter of 12.2 m. The existing subway was excavated by shallow tunnelling method. The project layout, geological conditions, reinforcement measures, operational parameters of shield machine and monitoring results of the project are introduced. During the Qinghuayuan tunnel excavation below the existing subway, total thrust, shield driving speed, cutterhead rotation speed and torque were manually controlled below the average values obtained from the previous monitoring of this project, which could effectively reduce the disturbance of the surrounding soil induced by shield excavation. The Gaussian fitting function can appropriately fit both the ground and the existing subway settlements. The trough width is influenced not only by the excavation overburden depth, but also by the forepoling reinforcement and tail void grouting measures.

摘要

研究依托京张高铁清华园隧道下穿既有北京地铁10 号工程, 既有地铁车站采用浅埋暗挖法施 工, 新建清华园隧道采用盾构法施工。论文详细介绍了工程地质条件、工程空间位置关系、地层加固 措施以及盾构机掘进参数, 建立了下穿既有线工程中, 地层、既有结构变形与盾构掘进参数的关系。 结果表明: 在新建隧道下穿掘进过程中, 盾构机的相关操作参数(盾构机的推进速度以及总推力, 刀 盘的旋转速度以及扭矩)被控制在**均值之下来减小盾构开挖对周围地层的扰动, 高斯方程可以较好 地拟合地层和既有线沉降, 地层沉降槽宽度受隧道埋深、地层加固措施以及盾构机尾部注浆的综合影 响。

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Authors and Affiliations

  1. Key Laboratory for Urban Underground Engineering of Ministry of Education, Bei**g Jiaotong University, Bei**g, 100044, China

    Qian Fang  (房倩), Jian-ming Du  (杜建明), Jian-ye Li  (**建业) & Ding-li Zhang  (张顶立)

  2. College of Civil and Transportation Engineering, Underground Polis Academy, Shenzhen University, Shenzhen, 518060, China

    Li-qiang Cao  (曹利**)

Authors
  1. Qian Fang  (房倩)
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  2. Jian-ming Du  (杜建明)
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  3. Jian-ye Li  (**建业)
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  4. Ding-li Zhang  (张顶立)
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  5. Li-qiang Cao  (曹利**)
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Corresponding author

Correspondence to Qian Fang  (房倩).

Additional information

Foundation item

Project(U1934210) supported by the Key Project of High-speed Rail Joint Fund of National Natural Science Foundation of China; Project(8202037) supported by the Natural Science Foundation of Bei**g, China

Contributors

The overarching research goals were developed by FANG Qian. ZHANG Ding-li and CAO Li-qiang performed the field monitoring. The initial draft of the manuscript was written by DU Jian-ming and LI Jian-ye. All authors replied to reviewers’ comments and revised the final version.

Conflict of interest

FANG Qian, DU Jian-ming, LI Jian-ye, ZHANG Ding-li, and CAO Li-qiang declare that they have no conflict of interest.

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Fang, Q., Du, Jm., Li, Jy. et al. Settlement characteristics of large-diameter shield excavation below existing subway in close vicinity. J. Cent. South Univ. 28, 882–897 (2021). https://doi.org/10.1007/s11771-021-4628-7

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  • DOI: https://doi.org/10.1007/s11771-021-4628-7

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