Engineering Geological Appraisal of Kuraz Diversion Weir Site

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Addis Ababa University


The study area is located in the South Western sector of Ethiopia. In the Southern Nations, Nationalities and People’s Region (SNNPR), at (latitude N 6° 18' 06" longitude E 36° 03' 19"). It is about 905 km far from Addis Ababa and about 120 km from Jinka town, the weir site under laid by feilsic volcanic rocks and quaternary sediments. The feasibility and detail study of the Kuraz weir site ended in 2012/13.exploratory drilling borehole and test pits excavation work along the weir axis has been carried out. However, review of geotechnical reports produced for the design and construction of the weir indicates that there are some remaining critical geotechnical information gaps. This study was thus undertaken to address and fill the gaps in relation to the Kuraz weir safety and an engineering geological appraisal. Thus, through the present study, an attempt has been made to identify the adverse foundation conditions, from the review of the previous investigation reports and during the present study through the surface and subsurface investigations, an overall appraisal of foundation condition of the site has been made. From the evaluation of the foundation condition, it has been deduced that the rocks on the foundation section are decomposed and needs grouting to improve strength condition. The abutments slope is kinametically stable for the present geometric configuration. The foundation sections in the presence study are characterized according to RMR rating. the ultimate bearing capacity value of the foundation materials were evaluated for each layer through RQD value of rocks and SPT value of soil and the foundation materials with low bearing nature are identified and in order to improve the material condition of soil strata certain improvement measures are suggested.



Engineering Geological, Appraisal, Kuraz Diversion Weir Site