Abstract
The construction of a civil engineering work requires many preliminary studies as well as various calculation methods to give an assessment or a forecast of the state of the rock in place and the behavior of the structure in its real environment and under various conditions (construction phase, service and operating phase). The present work concerns the access zone of the Dar-El-Oued tunnel, located on the national road n°43 about 40 km West of the city of Jijel (northeastern Algeria). The geotechnical study of this tunnel was carried out following the classification methods relating to underground structures. Through the results of this study we have determined the influence of land pressures on the mechanical behavior of the ground, which allowed us to measure the state of stress in the rock and to make a comparison between the results of the measurements of convergence and that of numerical modeling. On the other hand, the influence of the velocity of vibration induced by explosive shots has been discussed in order to check the stability of the face as the digging progresses. From the results obtained, it can be said that the surface displacements of the soil are relatively small compared to those determined by the numerical model at the level of the vault and the slab. Note the good agreement between the results provided by our numerical model and those obtained in-situ.
Highlights
Le projet du tunnel de Dar El-Oued s’inscrit dans les travaux d’adaptation fonctionnelle de la route côtière qui relie la ville de Jijel à la ville de Bejaia (Nord-Est Algérien)
Through the results of this study we have determined the influence of land pressures on the mechanical behavior of the ground, which allowed us to measure the state of stress in the rock and to make a comparison between the results of the measurements of convergence and that of numerical modeling
It can be said that the surface displacements of the soil are relatively small compared to those determined by the numerical model at the level of the vault and the slab
Summary
Le projet du tunnel de Dar El-Oued s’inscrit dans les travaux d’adaptation fonctionnelle de la route côtière qui relie la ville de Jijel à la ville de Bejaia (Nord-Est Algérien). Les travaux de creusement du tunnel ont provoqué une modification de l’état de contraintes dans la roche autour de la galerie. Ce changement d’état de contraintes est à l’origine des déplacements, qui affectent le terrain avoisinant et les structures préexistantes, particulièrement sensible, sachant que ce passage d’un état d’équilibre à un autre n’est pas instantané. Les travaux de creusement ont provoqué une succession d’instabilités intermédiaires, qui influencent l’état d’équilibre final. Quelle que soit la technique de construction employée, il se produit toujours des déplacements autour de la galerie, qui peuvent se propager dans le massif et atteindre la surface du sol. Ouest est protégée par une berlinoise en micro pieux renforcée avec des tirants d’ancrages
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