Longitudinal deformation of existing tunnel due to underlying shield tunneling

ZHANG Dong-mei; ZONG Xiang; HUANG Hong-wei

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Longitudinal deformation of existing tunnel due to underlying shield tunneling

更新时间：2026-06-25

- Longitudinal deformation of existing tunnel due to underlying shield tunneling
- Vol. 35, Issue 9, (2014)
- 作者机构：
  
  1. 同济大学地下建筑与工程系,上海,200092
  2. 同济大学岩土及地下工程教育部重点实验室,上海,200092
- 作者简介：
- 基金信息：
- DOI：
  CLC： U452
- Online First：16 September 2014，
  
  Published：2014
- 稿件说明：
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ZHANG Dong-mei, ZONG Xiang, HUANG Hong-wei. Longitudinal deformation of existing tunnel due to underlying shield tunneling[J]. 2014, 35(9).
DOI：

ZHANG Dong-mei, ZONG Xiang, HUANG Hong-wei. Longitudinal deformation of existing tunnel due to underlying shield tunneling[J]. 2014, 35(9). DOI：

摘要

城市地铁隧道施工中经常遇到新建隧道下穿上方已建隧道的例子，如何提前预测已建隧道的纵向变形是目前工程界普遍关心的问题。基于能够考虑土体变形连续性的Kerr地基梁理论，分别将已建隧道简化为欧拉伯努利梁和铁木辛柯梁，将新建隧道对已建隧道的作用简化为高斯分布荷载，建立了新建隧道施工对上方已建隧道影响的解析分析方法；并利用离心机试验结果进行了验证。分析了地层损失率、荷载形状参数和隧道与土体相对抗弯刚度对已建隧道纵向变形的影响。探讨了隧道剪切刚度对隧道纵向变形的影响。研究发现，当隧道剪切刚度趋于无穷大时，Kerr地基上的铁木辛柯梁退化为欧拉伯努利梁；对于抗弯刚度较大的隧道（如抗弯刚度大于7.54×106 kN?m2），Kerr地基梁具有较好的适用性；已建隧道的剪切刚度对其纵向变形何纵向曲率产生显著影响；当隧道等效剪切刚度有效系数≤1/4时，必须考虑隧道剪切刚度对隧道纵向变形的影响。将所提分析方法应用于上海盾构隧道穿越工程中，并与现场实测结果进行对比，验证了方法的合理性。

Abstract

The effect of underlying tunneling on existing tunnel is of great concern because the newly built tunnel can induce longitudinal deformation of existing tunnels. A prediction model based on the method of beam on Kerr elastic foundation is proposed. The existing tunnel is simplified as Euler-Bernoulli beam and Timoshenko beam

respectively

to consider the effect of the tunnel shear stiffness on the longitudinal settlement caused by the underlying tunneling. The impact of underlying tunneling on the existing tunnel is taken as Gauss-distributed loading. The proposed prediction method is then verified with the centrifuge results from the reference. The effects of volume loss

load distribution

relative bending rigidity between shield tunnel and ground and tunnel shear strength on the longitudinal settlement of existing tunnel caused by underlying tunneling are investigated

respectively. The results of Timoshenko beam are consistent with those of Euler-Bernoulli beam when the tunnel shear strength is big enough. The proposed method is more feasible for the tunnel with the bending rigidity greater than 7.54×106kN?m2. The effect of tunnel shear strength is very significant when the equivalent shear strength ratio is less than 1/4. The proposed method is finally validated using the field monitoring in Shanghai.

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