Abstract

The present study deals with engineering geological characteristics of the rock mass encountered in and on sides of Wadi Dawa'an, Hadramout governorate. During the present investigation, detailed studies were carried out on lithology, discontinuities, etc. and basic Geotechnical Description (BGD) of rock mass. The results revealed that, the Limestone (Umm erRhaduma Formation) has been classified into three zones (Zone I to Zone III), and the exposed parts of Sandstone (Mukalla Formation) into two zones (Zone I and Zone II). The Limestone (very steep cliff) varies from dark brown and moderately weathered in bottom, to dark grey and fresh in the upper most layer. Furthe, the exposed parts of Sand stone Rocks vary from highly and completely weathered, very low compressive strength to moderately weathered and low compressive strength.