Etude de stabilité et de la préservation de la route nationale N°79 localité d’Ain Sayah commune de Mila.

Abstract

The study area is part of the locality of Ain sayah, which is located east of the city of Mila on the right bank of the national road 79 connecting the wilaya of Mila and Constantine. Geologically, the terrain is covered by formations consisting of continental deposits with detrital dominant Mio-Plio-Quaternary. Earthworks and excavation work on the foundations of a theater led to the removal of the stop. The embankment resulting from this work remained unsupported for a long time, which expanded further. in addition to the abundance of truck traffic as well as the significant rainfall experienced in the region where major disturbances have been manifested on the road and on the piles supporting the road. The analysis of the causes of this phenomenon highlights the combination of predisposing factors as well as triggering factors.The analysis of the causes of this phenomenon highlights the combination of predisposition factors as well as triggering factors. A type of comfort has been envisaged to preserve the natural balance and to support the overloads brought by the circulation of the heavy weight, the reconstitution of the abutment by a wall weight anchored on two rows of piles of file of 15.50m. The stability analysis was carried out under computer using two software packages (Geo Studio and Nixes and Trolls) to determine the values of the safety factors before and after comfort and under the effect of earthquake without taking into account the overload brought by the circulation of the heavy weight. The stability calculation results showed that the slope before the reinforcement is in a precarious stability but the application of the adopted solution ensures the stability of the assembly and absorbs the action of all the overloads of the heavy truck circulating upstream with safety factors greater than 1.5, admissible coefficients even in the presence of the earthquake.