Engineering Geological Appraisal of Kuraz Diversion Weir Site
No Thumbnail Available
Date
2014-05-05
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
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.
Description
Keywords
Engineering Geological, Appraisal, Kuraz Diversion Weir Site