Analysis of foundation settlement induced by shield construction of Nantong metro underpassing existing buildings

ZHANG Bin; WANG Rui; WANG You

doi:10.11835/j.issn.2096-6717.2021.172

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Analysis of foundation settlement induced by shield construction of Nantong metro underpassing existing buildings

Civil Engineering | 更新时间：2023-05-25

- Analysis of foundation settlement induced by shield construction of Nantong metro underpassing existing buildings
- Journal of Civil and Environmental Engineering Vol. 45, Issue 3, Pages: 24-33(2023)
- 作者机构：
  
  1.中铁（上海）投资集团有限公司，上海 200126
  2.中南大学土木工程学院，长沙 410075
- 作者简介：
  
  ZHANG Bin (1973- ), senior engineer, main research interest: metro shield, E-mail: 364351316@qq.com.
  WANG You （corresponding author）， associate professor， doctorial supervisor， E-mail： ywang1920@csu.edu.cn.
- 基金信息：
  
  National Natural Science Foundation of China(51778633;51308552);2020 Science and Technology Research and Development Plan Guiding Subjects of China Railway Corporation(序号41;243)
- DOI：10.11835/j.issn.2096-6717.2021.172
  CLC： U455.43
- Received：20 April 2021，
  
  Published：25 June 2023
- 稿件说明：
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ZHANG Bin, WANG Rui, WANG You. Analysis of foundation settlement induced by shield construction of Nantong metro underpassing existing buildings[J]. Journal of Civil and Environmental Engineering, 2023, 45(3): 24-33.
DOI：

ZHANG Bin, WANG Rui, WANG You. Analysis of foundation settlement induced by shield construction of Nantong metro underpassing existing buildings[J]. Journal of Civil and Environmental Engineering, 2023, 45(3): 24-33. DOI： 10.11835/j.issn.2096-6717.2021.172.

摘要

针对盾构机下穿既有建筑问题，以南通地铁1号线环城东路站至中级人民法院站盾构区间下穿森大蒂花苑老旧居民区为研究对象，基于现场沉降监测，进行盾构施工对既有邻近建筑基础沉降的影响分析，针对盾构隧道下穿该老旧居民区进行数值模拟，综合考虑上部建筑荷载及盾构施工对围岩的扰动，对建筑物基础沉降进行分析。结果表明：盾构机在高富水砂土、粉土中掘进时，由于对地层的扰动和孔隙水消散等原因，易使机头扭转，造成掘进不稳定，最终引起地表沉降；而通过设置合理的土压力值，保持掘进面平衡，尽量使盾构机平稳通过，同时做好注浆、衬砌与地层间缝隙填充等工作，能够有效减小盾构引起的地表沉降。

Abstract

In response to the problem of shields that underpass the existing buildings

the Nantong Metro Line 1 interval

from the East Huancheng Road Station to the Intermediate People's Court Station

which underpasses the old residential area of the Community Sendadi-Huayuan

was taken as the research case history. Based on the site settlement monitoring data

the impact of shield tunnel construction on the settlement of the adjacent buildings foundations was analyzed. Numerical simulations

taking into account the upper building load and the shield construction disturbance to the surrounding rock

were performed. The pattern of building foundation settlement was summarized. The results show that when the shield machine is tunneling in highly water-rich sandy soil and chalky soil

the head of the shield machine is prone to twisting due to soil disturbance and the dissipation of pore water

which causes instability in the excavation process and eventuallyresults in surface settlement. By setting a reasonable value of soil pressure

maintaining the balance of the digging surface

making the shield machine pass as smoothly as possible

while performing a grouting well

and filling the gap between the lining and the strata

the surface settlement caused by the shield can be effectively reduced.

关键词

Keywords

references

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