Abstract: The selection of highway alignment in the mountain area should consider the geological conditions. Geohazards in the mountain areas, such as, landslides, has the characterization of large influence area, high mitigation and maintenance cost and it might affect the feasibility of the highway alignment. In the phase of final alignment determination, if the potential landslide within the potential alignment alternates can be identified and explored, the highway alignment can be determined with much less construction and maintenance cost. The large landslide near Minda Village was investigated and the sliding limits were mapped, the principal sliding direction was determined. The stability of the landslide body was evaluated by using test borings, geo-physical methods and other in-situ as well as laboratory geotechnical testing methods. The geotechnical parameters at the sliding body were back analyzed and these are used in the stability evaluation of the proposed highway under various working conditions. The quantity of the potential landslide are also estimated and the mitigation methods are also proposed in the paper.

Key words: Mountain Highways, Highway Alignment Selection Considering Geological Conditions, Alignment Determination, Landslides, Engineering Exploration