Abstract
Khartoum-Portsudan national highway represents the economic and commercial highway that link Sudan capital with main cities in eastern Sudan such as Suakin, Bashair and Digna harbors. The highway crosses the Red Sea Hills through high ridge mountains of Alagaba region. The highway consists of two roads: old and new road that are constructed in different time. Some geo-hazards such as rock falls, debris flows and rock failures represent the main natural geological hazards along the new road in compare with old road. However, the properties of rock mass discontinuities play an important role in the behavior of rock slope stability. This study is aimed to assess the geological hazards, probability of failure, and suggest suitable treatments of unstable rocks to mitigate the road from hazardous phenomena. This study is mainly based on geological observations and structural measurements. Field observations as well as kinematic analyses show that rock fall and debris flow can occur. In addition, toppling and wedge failures can probably happen. Based on the data analysis some suitable reinforcements (e.g. benches, catch fences and meshes) are recommended in the location of hazardous sites to prevent the road against from rock falls, debris flows and failures.
Published Version
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