Investigations of Landslide Problem Using Geophysical Techniques Around Debresina–Armania Main Road in Tarmaber Woreda, Northern Shewa Zone, Ethiopia

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Addis Ababa University


Geophysical and geological investigations have been conducted for landslide problem characterization of the existing main road of the study area. The site is located in between Debresina and Armania towns, Tarmaber Woreda, northern Shewa Zone of Amhara Regional State. The main objective of the study was to image subsurface of the problematic main asphalt road, identify triggering mechanisms of landslide problem, and recommend possible mitigation measures based on the geo-electrical resistivity stratification of the site and magnetic anomalies obtained over the survey area. Geophysical investigations using 2D electrical imaging and magnetic methods have been conducted for the landslide problem of the road located at kebele Dokakit near Sar Amba Kidanemhiret locality between Debresina and Armania towns. From the results of the survey, it has been possible to map the sliding subsurface of the geologic layers, their vertical and lateral extents. It has also been possible to map areas of weakness in the subsurface that could be causing and damaging to the life of the road. According to the interpretation of the geophysical results, the near surface geology of the study area includes fragmented and disturbed layers together with expansive clay soils which have also considerably cause of sliding problem over the area. In profile three the clay soils are much thicker than the other two profiles. In profile three low resistivity deposits are dominant particularly in the northeastern side of the survey area. These deposits are may be huge deposits of the fragmental basalt and expansive clay soils that are moved down the slope and accumulated in location of profile three which is just down the road. Based on the joint interpretation of the results, the surveyed area has possible slide zone which is characterized by fragmented and structurally disturbed portion which starts from almost half of the surveyed line towards northeast direction. This is interpreted to be the response of the water saturated, weathered and fractured basalt rock. There is also landslide affected subsurface that exhibits intermediate apparent resistivity values comprises of the southwest end of the surveyed profiles. This zone consists of surface of weakness and some displaced rock units. As conclusion from the work, the asphalt road parallel to the survey profiles has active sliding problem and cracks especially at the two ends of the profiles. The different weak zones, deeply weathering conditions, action of rain fall, springs and slope nature of the study area were the causing factors for this sliding problem. Therefore, special attention should be given to maintain and protect from further sliding problem.



Investigations of Landslide, Problem Using Geophysical, Techniques Around Debresina–Armania, Main Road in Tarmaber Woreda, Northern Shewa Zone, Ethiopia