Infeluence des paramètres géomécaniques sur la stabilité des pentes rocheuses ( Cas des Gorges de Kherrata )

Abstract

This paper is devoted to the study of problems of stability of rock slopes under the influence of the different geomechanical parameters of the discontinuities which could be the most important factor controlling the stability of the rock mass. The kinematic analysis allows to reveal the different modes of rupture. The results of the SMR classification show that the breaks are almost all unstable, constituting hazards that are potentially characterized by the fall of blocks that are more numerous in the study area and that threaten road users when the vulnerability of this network is high. The crossing between hazard and vulnerability determines the risk of falling blocks in slopes. The main objective of this work is based on the prioritization and qualification of the risk of falling blocks using a quantitative scoring method (RHRS: Rockfall Hazard Rating System) which allows the risk to be ranked on each homogeneous section studied after the evaluation Of all the scores of the criterion governing the fall hazard and the criteria that control the vulnerability of the road network. The application of this method makes it possible to prioritize 743 meters of length qualified from high to very high risk over a total length of 1100 meters. In order to assess these risks, the definition of the Isevere solutions required by the protection and reinforcement structures proposed for the construction in the rocky slopes most exposed to reduce the risk.