المجلة الدولية للعلوم والتقنية

The basalt dikes were revealed as a result of the cutting of the slopes of the Tobi mountain road slopes that lead to the city of Gharyan. In order to evaluate the effect of these basalt dikes in the study area and exactly In Sidi As Sid formation, Engineering Properties for discontinuity surfaces were mainly used to evaluate the stability of the parallel slopes of the road. For this reason, The whole site mentioned above was given symbol (LT-G-19) in addition to other four chosen positions. The positions (L1 and L3) are not affected by basalt dikes. In contrast, the two other positions (L 2 and L 4) are affected by basalt dikes, Field measurements were basically used at this point to measure the rock section there and that sized (140m2). When Conducting mathematical calculations and comparing them to scientific and international standards and specialized studies, It was found that the positions which are not affected by basalt dikes have a high RQD strength of (86.24%) as (GOOD) description and also have two joints set (s1 and s2), While the sections affected by basalt dikes showed the intersection of four joints set (S1.S2,S3,S4), with an average of Rock Quality Designation (43.06 %)As poor descriptive, As a result of the weakness of the sections. Parts of the sections the affected by basalt dikes will be fallen down and automatically destroyed, The type of movement at this stage is known as (rock fall). The study confirms that the basalt dikes can be classified as mechanical weathering factors for rocks.