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Influence of Benoto bored pile construction on nearby existing tunnel: A case study

机译：Benoto钻孔桩施工对附近现有隧道的影响：案例研究

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摘要

The monitoring and analysis of lateral displacement for metro tunnels are very important because the metro systems are the lifeline of metropolises. This paper presents a case study of a site in Nanjing, China, where the Benoto bored piles were constructed nearby the existing tunnel. The construction technology, a combination of the Benoto bored piles construction and the conventional construction technology of circulating slurry, is illustrated in detail. The lateral displacement at six test sections were measured and discussed to assess the impact of piles installation on the stability and integrity of the existing tunnel. The measured results showed that during the construction period using the Benoto method, relatively large lateral displacement occurred at the depth with soft soil (Mucky silty clay), with characteristics including a large void ratio, high plasticity, poor permeability, high water content, low shear strength, and low modulus of deformation. During the construction period of the conventional Circulating-Slurry method, negative lateral displacement occurred below the tip of the casing due to the soil arching effect, indicating an inward movement towards the Benoto bored piles. The maximum lateral displacement decreased as the distance between piles and inclinometers increased, with a maximum difference of 45% at the end of the measurements. It was also observed that the measured maximum lateral displacement was less than the cumulative trigger value of 20 mm, indicating an effectiveness of Benoto bored piles constructed adjacent to existing tunnel. This case study may provide the means for a qualitative assessment for engineering constructions where the situation bears similarities. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：地铁隧道的横向位移的监测和分析非常重要，因为地铁系统是大都市的生命线。本文以中国南京为例，在现有隧道附近建造了Benoto钻孔桩的案例研究。详细说明了Benoto钻孔桩施工和循环泥浆的常规施工技术的结合的施工技术。测量并讨论了六个测试段的横向位移，以评估桩安装对现有隧道的稳定性和完整性的影响。测量结果表明，在使用Benoto法的施工期间，软土（Mucky粉质粘土）的深度发生了较大的侧向位移，具有空隙率大，可塑性高，渗透性差，含水量高，低等特点。抗剪强度高，变形模量低。在传统的循环泥浆法施工期间，由于土拱效应，在套管尖端下方出现了负向横向位移，表明向Benoto钻孔桩的向内运动。最大横向位移随着桩与测斜仪之间距离的增加而减小，在测量结束时最大差值为45％。还可以观察到，测得的最大横向位移小于20 mm的累积触发值，表明与现有隧道相邻建造的Benoto钻孔桩的有效性。该案例研究可能为情况相似的工程建设提供定性评估的手段。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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  • 来源
    《Soils and foundations》 |2019年第2期|544-555|共12页
  • 作者

    Gao Guoyao; Zhuang Yan; Wang Kangyu; Chen Liang;

  • 作者单位

    Southeast Univ, Sch Civil Engn, Key Lab RC & PRC Struct, Educ Minist, 2 Sipailou, Nanjing 210096, Jiangsu, Peoples R China|Lanzhou Univ Technol, Sch Civil Engn, Lanzhou 730050, Gansu, Peoples R China;

    Southeast Univ, Sch Civil Engn, Key Lab RC & PRC Struct, Educ Minist, 2 Sipailou, Nanjing 210096, Jiangsu, Peoples R China|Changsha Univ Sci & Technol, Natl Engn Lab Highway Maintenance Technol, Changsha 410114, Hunan, Peoples R China;

    Zhejiang Univ Technol, Sch Civil Engn & Architecture, Hangzhou 310014, Zhejiang, Peoples R China;

    Hohai Univ, Geotech Res Inst, Key Lab, Minist Educ Geomech & Embankment Engn, 1 Xikang Rd, Nanjing 210098, Jiangsu, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lateral displacement; Benoto bored piles; Existing tunnel; Construction technology; Case study;

    机译：横向位移;BENOTO乏味桩;现有隧道;施工技术;案例研究;

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