Assessment of geotechnical properties of Draa El Mizane highway tunnel (Algeria)

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Authors:


N.Fellouh, Laboratory of Mineral Resources Valorization and Environment, Badji Mokhtar University, Annaba, Algeria, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

M.L.Boukelloul, Laboratory of Mineral Resources Valorization and Environment, Badji Mokhtar University, Annaba, Algeria, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

A.Aissi, Mining, Metallurgy and Materials Laboratory, National High School of Mining and Metallurgy, Annaba, Algeria

M.Fredj, Laboratory of Mineral Resources Valorization and Environment, Badji Mokhtar University, Annaba, Algeria, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.


повний текст / full article



Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2020, (6): 055 - 060

https://doi.org/10.33271/nvngu/2020-6/055



Abstract:



Purpose.
To show the results of geotechnical studies and design the support system chosen in complex geological conditions especially in fault zones. The Draa El Mizane highway tunnel was a research site.


Methodology.
The determination of geotechnical properties by different classification systems for the quality of the rock mass such as the Q index, Rock Mass Rating RMR and the Geological Resistance Index GSI. In addition, the choice of the support system is validated by numerical modeling via the 2D Phase 2 program.


Findings.
The geotechnical measures developed through extensometer monitoring show a major compatibility between the geotechnical design and the digital simulation, which validates the reliability of the selected support system.


Originality.
A type of support chosen during construction is established, which corresponds to local specific conditions in order to eliminate instabilities.


Practical value.
The values obtained by numerical modeling can give us a final decision for the support system chosen: values in terms of deformations in order of 1.5 cm at the top, 7.5 and 13.5 cm for the left and right wings respectively, 9.0 and 18 cm in the lower half left and right, 22.5 cm for the base of the tunnel. Furthermore, the results obtained by the measurements of instrumentation in the dimensioning of the support type are well illustrated through the measurements by an extensometer, which are very compatible with the results of numerical modeling.


Keywords:
classification systems, geotechnical engineering, Phase2 2D, Fault zone, underground structures, Draa El Mizane highway tunnel

References.


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