Geological evolution of Nile Valley, west Sohag, Upper Egypt: a geotechnical perception

Based on distinct variations of textural characteristics, stratigraphical relationships and mineral composition of clastics sedimentary sequence (coarse aggregates) in west Sohag, Upper Egypt had been classified into six individual geological evolutionary stages. These stages were controlled mainly by geomorphology, paleo-climatic conditions, and regional and local tectonic events. In west Sohag, Upper Egypt, the suitability of the Oligocene-Pleistocene natural coarse aggregates have been examined in terms of pavement materials in a sub-base consideration. Depending on textual characteristics and mineral composition, these natural coarse aggregates indicated three distinct stages of geological evolution of the Egyptian Nile Valley. These aggregates are classified as well-graded gravels (GW) and distinguished by cubical shape with sub-angular to sub-rounded edges, as well as characterized by a relatively high abrasion resistance. This leads to a suitability of these natural aggregates in being used as a sub-base pavement course for higher shear strength, exhibiting a less fatigue life. The total estimated volume of these coarse aggregate is 2060.41 million m(3). This volume of natural coarse aggregates can be dry sieved and crushed to produce base and surface pavement courses.