Coupling method for analyzing the influence on existing tunnel due to adjacent foundations pit excavation

ZHOU Ze-lin; CHEN Shou-gen; TU Peng; ZHANG Hai-sheng

doi:10.16285/j.rsm.2015.0793

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Coupling method for analyzing the influence on existing tunnel due to adjacent foundations pit excavation

更新时间：2026-06-25

- Coupling method for analyzing the influence on existing tunnel due to adjacent foundations pit excavation
- Vol. 39, Issue 4, Pages: 1440-1449(2018)
- 作者机构：
  
  1. 西南交通大学土木工程学院交通隧道工程教育部重点实验室,四川,成都,610031
  2. 西南交通大学土木工程学院,四川,成都,610031
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2015.0793
  CLC： TU45
- Online First：06 June 2018，
  
  Published：2018
- 稿件说明：
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ZHOU Ze-lin, CHEN Shou-gen, TU Peng, et al. Coupling method for analyzing the influence on existing tunnel due to adjacent foundations pit excavation[J]. 2018, 39(4): 1440-1449.
DOI：

ZHOU Ze-lin, CHEN Shou-gen, TU Peng, et al. Coupling method for analyzing the influence on existing tunnel due to adjacent foundations pit excavation[J]. 2018, 39(4): 1440-1449. DOI： 10.16285/j.rsm.2015.0793.

摘要

为了更合理和快捷地评估基坑施工对邻近已建地铁隧道的影响，将隧道视为弹性的地下连续梁来分析隧道本身的受力和变形，推导了隧道与周围土体相互作用的有限元耦合平衡方程，并引入弹性半空间层状模型来分析基坑卸载对土体和隧道变形性能的影响，建立了层状地基中基坑开挖对邻近隧道影响的耦合分析方法；然后，将提出方法与两阶段方法进行了算例对比，并结合离心机试验结果和工程实测数据进行了验证。研究发现，与两阶段方法相比，耦合方法在能反映出非均质层状地基土体的应力和应变集中（或扩散）现象，不仅具有更好的计算精度，而且减少了计算参数的数量；提出方法的理论计算值与离心试验结果基本一致，与工程实测变形数据基本吻合，验证了方法的有效性；通过工程实际应用得出的一些有益结论，可为合理制定城市基坑施工对邻近隧道影响的保护措施提供一定的理论依据。

Abstract

Due to the construction of adjacent foundation pit

the tunnel is assumed to be an elastic continuous beam to simulate its stress and deformation

which could estimate the influence on existing metro tunnel more rationality and rapidly. A coupled finite element balance equation is deduced for analysing the interaction between the tunnel and surrounding soil mass. Meanwhile

an elastic layered half-space model is adopted to investigate the effects of the foundation pit unloading on the deformations of soil mass and tunnel. A coupling method is proposed to estimate the influence on adjacent tunnel due to foundation pit excavation in layered soil. Furthermore

the proposed method is compared with the two-stage method through a case study and is verified with the centrifuge results and measured results in site. Results show that

compared with the two-stage method

the coupling method can reflect the concentrations（or dispersion） of stress and strain in layered foundation soil. The proposed method can not only obtain more accurate results

but also reduce parameter numbers during calculation. The theoretical calculation results are basically consistent with that the results from centrifuge tests and measurements on site

which verifies the validity of the proposed approach. Useful conclusions obtained through practical applications may provide the certain theoretical basis for the rational development of protective measures for the construction of urban foundation pits on the adjacent tunnels.

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