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Study on the interaction of the rock massive and support setting of tunnels

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Category: Geotechnical and mining mechanical engineering, machine building

Last Updated on 10 November 2019

Published on 26 October 2019

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Authors:

D.E.Boudjellal, Mineral Resources and Development Laboratory, Badji Mokhtar University, Annaba, Algeria, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

A.Hafsaoui, Prof., Mineral Resources and Development Laboratory, Badji Mokhtar University, Annaba, Algeria, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

A.Aissi, Dr. Sc. (Tech.), Mining, Metallurgy and Materials Laboratory, National High School of Mining and Metallurgy, Annaba, Algeria

Abstract:

Purpose. Studying the behaviour of underground working and specifying the design of its support. Modelling of a tunnel is done in the three-dimensional problem statement due to the interaction between the mine rocks and excavation support.

Methodology. The study on the interaction between an excavated massif and excavation support was conducted using the convergence-confinement method. Moreover, methods were used developed to determine the factors intervening during the interaction of the rock and support and to establish a structural flowchart for the conduct of the tunnel. Two methods are used for defining the factors of interaction of the rock and support. They are computational analytical convergence-confinement method and numerical method based on Plaxis^2D software.

Findings. Based on the results of the simulation at (PK-0 +625) we can claim that the support with dimensions of 0.75 to 1 m +along with shotcrete with a thickness of 0.2–0.3 m, whose parameters are proved empirically, is reliable. Yielding of the construction recorded in the tunnel also testifies to the reliability of this support.

Originality. The results obtained through the empirical method show that the proper support should correspond to type S3.

Practical value. The results of the numerical simulation correspond to the data of the maximum vertical displacement, which makes 4.18 ⋅10^-3m for the bed rock. This will allow obtaining possible decrease in tunnel outline, which makes properly 2.7 ⋅ 10^-3 m with a floor heave of 0.75 ⋅10^-3m and the field of horizontal displacements of the order of 1.45 ⋅10^-3m. As a result of the research, the problem of mass displacement is solved with higher technical and economic efficiency.

References.

1. Champagne De Labriolle, G. (2017). Amélioration des méthodes analytiques basées sur des concepts simples pour le dimensionnement des tunnels superficiels et profonds en sol meuble, (Improved analytical methods based on simple concepts for the dimensioning of shallow or deep tunnels in soft ground). Rev. Fr. Geotech., 151.2, 1-20. DOI: 10.1051/geotech/2017004.

2. Champagne De Labriolle, G., Bozonnet, F., Givet, O., Tan, Ch-H., & Guedon, P. (2017). Développement du projet MASCOT pour la conception et le dimensionnement des tunnels (Development of MASCOT project for design and dimensioning of tunnels). In Conference AFTES International Congress 2017 (pp 1-10), Paris.

3. Jassionnesse, C., Tsirogianni, A., & Favre, M. (2013). New development using the “convergence-confinement” method in an anisotropic stress field. In Anagnostou, G., & Ehrbar, H. (Eds.). Underground – the way to the future! World Tunnel Congress 2013 (pp. 738-745). Geneva. CRC Press, ISBN: 978-1-138-00094-0 978-1-315-88727-2.

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5. Boudjella, D. J., Hafsaoui, A., & Talhi, K. (2017). Numerical Modeling by Plaxis Software (3D), the Effect of Digging a Tunnel on the Behavior of the Ground and Overlying Structures Case: Subway of Algiers (Algeria). In “Sustainable Civil Infrastructures: Innovative Infrastructure Geotechnology”, Engineering Challenges for Sustainable Underground Use, Sustainable Civil Infrastructures, International Congress and Exhibition (pp 173-206). DOI: 10.1007/978-3-319-61636-0_14.

6. Elhouari, N., Allal, M.-A., & Nabil, A.-B. (2011). Numerical Simulation of the Mechanical Response of the Tunnels in the Saturated Soils by Plaxis. Jordan Journal of Civil Engineering, 5(1), 24-29.

7. Brinkgreve, R. B. J. (Ed.) (2018). PLAXIS 2D Manuals. General Information, Tutorial Manual, Reference Manual, Material Models Manual, Scientific Manual. Delft University of Technology & PLAXIS bv, The Netherlands, ISBN-13: 978-90-76016-24-5 Retrieved from www.plaxis.com.

8. Vydrova, L.-C. (2015). Comparison of Tunnelling Methods NATM and ADECO-RS. The Civil Engineering Journal, (3), 2-5.

9. Arshad, Kh., & Rini-Asnida, A. (2016). A Review on Selection of Tunneling Method and Parameters Effecting Ground Settlements. Electronic Journal of Geotechnical Engineering, 21(14), 4459- 4462.

10. Barton, N. (2017). Minimizing the use of concrete in tunnels and caverns: comparing NATM and NMT. In Innov. Infrastruct. SoluT (pp. 2-13). Springer International Publishing AG.

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