E.E. Kheirelseed  , T.H. Ming  , S.B. Abdalla  , 
    Rock Masses Evaluation for Different Engineering Purposes in and Around Khartoum State-Sudan,
    Journal of Engineering and Applied Sciences,
    Volume 3,Issue 1,
    2008,
    Pages 16-22,
    ISSN 1816-949x,
    jeasci.2008.16.22,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2008.16.22)
    Abstract: This study is concerning with the rock masses classification in Khartoum State for different engineering purposes in accordance to the growing needs of the city. The main classification systems that utilized in this study were: Franklin classification in which he presented the point load strength and the fracture spacing; the Rock Mass Rating system (RMR) which advanced by Bieniawski and NGI-Q Rating, Q system.  In the field, some measurements (mainly joint set numbers, separation, continuity and orientations) and rock mass description were carried out in quarries or well exposed rock mass wall. Some sheets were designed to facilitate recording data beside the use of Schmidt hammer for crude joint wall strength and collection of samples for laboratory study (point load and density tests). The reconnaissance survey of the study area did reveal an abundance of naturally occurring construction materials in Sabaloka area. Also simple excavation due to the jointing system was detected for most of the examined rock types.
    Keywords: Rock mass;point load strength;Schmidt hammer;fracture spacing;rock mass rating