Geological factors significant in the assessment of rippability

Abstract

The geological factors that are significant in the evaluation of excavation characteristics of earth and rock materials are described and a guide to the assessment of rippability by tractor mounted rippers is provided. A rippability rating chart is proposed, utilizing the geological parameters which influence ripping and excavation operations. Case histories are presented which illustrate the point that, although seismic wave velocities may provide an indication of the rippability of a rock mass, the geological conditions must also be considered. The term assessment is used deliberately since it must be appreciated that very often a conclusive answer as to whether a rock can be ripped or not just cannot be obtained. In such a situation, only a field test will decide the issued. (A)