Stability Analysis of a Rock Mass in Seismic Conditions: Case Study in Lebanon

Abstract eng:
The objective of this work is to analyze the rock slopes stability under seismic conditions with a real Lebanese case study. High and steep slopes characterize the topography of Lebanon. Moreover, this country could be subjected to serious earthquakes because it contains one major fault and few secondary faults where some ones have been discovered recently. In Lebanon, slope areas become overcrowded because of the high population growth and migration of the population from urban zones. In this paper, we perform a numerical analysis using the UDEC code of the seismic response of fractured rock mass slope representing a real case in Lebanon. We use the seismic loading recorded during the Kocaeli earthquake (Turkey, 1999). The effect of different configurations of fracture networks is highlighted. In the absence of discontinuities, the rock mass is stable without the registration of permanent displacement in the upper part and it behaves as in the case of the rigid block. The presence of horizontal discontinuities leads to a permanent shift in the upper part of the rock, this shift tends to increase going towards the inside of the model; A small rocking motion induced in the solid by the seismic loading and could be neglected.

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