土工基础

土工基础 ›› 2021, Vol. 35 ›› Issue (2): 139-143.

• 工程实录 • 上一篇    下一篇

软土地区盾构始发端头合理加固范围的研究

马高峰1，朱金贤1,2，曹丙柄1，吴祥泰1   

  1. （1.绍兴市轨道交通集团有限公司，浙江绍兴 312000；2.绍兴文理学院土木工程学院，浙江绍兴 312000）
  • 收稿日期:2020-01-12 修回日期:2020-11-19 出版日期:2021-04-23 发布日期:2021-04-23
  • 通讯作者: 朱金贤（1995-），男，助工，硕士研究生，研究方向为地铁车站、盾构隧道。
  • 作者简介:马高峰（1987-），男，工程师，研究方向为地铁车站、盾构隧道。

Estimation of Improvement Zone of Launching End of Tunnel Boring Machine Excavations in Soft Soils

MA Gaofeng1, ZHU Jinxian1,2, CAO Bingbing1， WU Xiangtai1   

  1. (1.Shaoxing Rail Transit Group Co. Ltd., Shaoxing 312000;
    2.College of Civil Engineering, Shaoxing University, Shaoxing 312000)
  • Received:2020-01-12 Revised:2020-11-19 Online:2021-04-23 Published:2021-04-23

摘要： 以绍兴轨道交通1号线某盾构隧道施工为例，分别采用日本弹性薄板理论、静力理论和滑移失稳理论计算盾构始发端头加固范围，并利用ABAQUS建模分析，得到盾构始发端头在不同加固范围内土体位移和应力变化曲线，再将模拟结果与工程实测数据进行对比分析。结果表明：纵向加固长度为6 m，横向加固长度为3 m为绍兴软土地区盾构始发端头加固合理范围；日本弹性薄板理论计算获得的纵向加固长度与经过模拟分析、工程实测综合判定的纵向加固长度相近，可采用弹性薄板理论初步确定绍兴软土地区的纵向加固长度。

关键词: 盾构始发, 端头加固, 理论计算, 数值模拟, 工程实测

Abstract: This paper presents a case history of estimating the soil improvement zone for the launching end of the Tunnel Boring Machine excavation method in soft soil in Shaoxing Transit Line No. 1. The improvement zone is estimated by three different approaches: namely, elastic plate theory, static approach and sliding instability theory. Numerical analysis of soil deformation and strain at various location of the soil improvement zone was performed by finite element software ABAQUS. The analytical results were compared with the construction monitoring data. The results show that: an improvement zone with a length of 6 meters in the longitudinal direction and a width of 3 meters in transverse direction is appropriate for the launching end of the TBM excavation. The longitudinal length of the improvement zone estimated by elastic plate theory is close to the results of numerical and monitored data. Therefore, the elastic plate theory should be applied in this project.

Key words: TBM launching end, end improvement zone, theoretical analysis, numerical simulation, engineering monitoring

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