Evaluation of the parallel slope stability of Albieb Mountain Road -NW Libya.

Abstract

Monitoring and studying the stability of parallel slopes along mountain roads is of paramount importance as it contributes to evaluating the stability of slopes and the materials comprising them. Unfortunately, Libya often lacks such studies, especially in the mountain roads of the Western Mountain area. This research cited the Albieb Mountain Road, which revealed a weak area characterized by signs of potential level collapse. The direction of collapse suggests that if   a collapse were to occur, the dislodged materials would move towards the mountain road, potentially causing material and human damages or road closure. The general objective and main goal of this study were to evaluate and study the stability of the slope parallel to the road and analyze its stability using field and laboratory studies, along with utilizing the RocPlane software. The most significant results obtained indicated that the effective impact of cohesion, friction, and density values became apparent when inputting the data as variables into the software. The safety factor values decreased, registering the lowest decrease when the moisture content reached 34% with a safety factor of 0.5, along with a noticeable decrease in the values of resistance strength from 248.596 t/ft at 8.2% moisture content to 38.328 t/ft when the cohesion value reached 3.1. It is noteworthy that changes occurred in both the cohesive strength and weight force with a safety factor of 0.59 at 40 mm.