Analysis of surface settlements induced by tunnel excavation with EPB-TBM
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- Category: Content №1 2023
- Last Updated on 25 February 2023
- Published on 30 November -0001
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Authors:
N.Mekahlia*, orcid.org/0000-0002-5586-1938, Mining, Materials, and Metallurgy Laboratory, National Higher School of Mining and Metallurgy, Annaba, Algeria, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Y.Khadri, orcid.org/0000-0002-9040-7036, Badji Mokhtar University, Annaba, Algeria
S.Bensehamdi, orcid.org/0000-0002-0704-9777, Mining, Materials, and Metallurgy Laboratory, National Higher School of Mining and Metallurgy, Annaba, Algeria
A.Benselhoub, orcid.org/0000-0001-5891-2860, Environment, Modeling and Climate Change Division, Environmental Research Center, Annaba, Algeria
* Corresponding author e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2023, (1): 088 - 093
https://doi.org/10.33271/nvngu/2023-1/088
Abstract:
Purpose. To investigate the efficiency of various approaches to predict surface settlements due to tunnel excavation.
Methodology. To appreciate the surface displacements, our study is focalized on the case of a real tunnel in a layered ground (Algiers’s Metro), where a tunnel boring machine was driven for the first time in this country. Firstly, the surface settlement trough was calculated with empirical, analytical, and numerical (FEM) methods. Secondly, a set of numerical analyses was carried out to inspect the evolution of surface settlement as the TBM progresses. Finally, a parametric study was performed to examine the construction step most productive for surface settlement.
Findings. FEM is a useful tool for predicting surface displacements due to tunnelling, especially when assigning an adequate and sophisticated behaviour model.
Originality. A reference numerical model which represents well the construction procedures of the Algiers tunnel has been established.
Practical value. This study illustrates that the results obtained by FEM with the use of Hardening Soil as a constitutive model to represent the soil are almost identical to those measured during the tunnel excavation. On the other hand, the empirical formulas available in the literature are not always efficient to predict surface movements.
Keywords: surface settlements, tunnelling boring machine, empirical method, analytical method, finite element method
References.
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