Evaluating The Geo-mechanical Properties Of The Jimma Volcanic And Makkonnen Basaltic Rock Formations A Specific Guideline For Use In The Construction Industry (a Case Study On Wabe Hydropower Project Ethiopia)

In the present study, the engineering properties of the Jimma volcanic and Makkonnen basalticrnrock formations located in the south-western part of Ethiopia in Wolkite Town are assessed. It isrnaimed to propose a guideline useful in the early stages of site investigation. A systematicrnmethodology is followed which includes review of secondary reports on investigations and designrnand; collection of primary data from subsurface and surface outcrops of the geological formation. rnThe physical and mechanical properties of rock materials such as water absorption, specificrngravity, porosity, flakiness index (FI) and elongation index (EI), Uniaxial Compressive Strengthrn(UCS), Aggregate Crushing Value (ACV), Aggregate Impact Value (AIV) and Los AngelesrnAbrasion (LAAV) have been determined with reference to the various specifications and standardsrn(AASHTO, ASTM and BS) in terms of suitability in the construction industry. WA value rangesrnfrom 0.2-5.52%, porosity values range from 1.17-13%, SG values range from 2.02-2.92%, FI andrnEI values range from 5.26-32.24% and 14.65-22.57% respectively; UCS value ranges from 1.37237.29MPa,rnrnACV value ranges from 16.23-20.33%; AIV values range from 10.02-12% andrnLAAV values range from 24.32-29%. rnThe data analysis from the geological logs and the seismic refraction survey suggests that thernbedrock is located at a deeper depth represented by fresh, massive and slightly fractured basalt ofrnhigh quality (RMR>65) represented by high P-wave velocity (Vp>5000m/s). Some very soft tuffrnrocks and heavily jointed media have Vp

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