This research involves geotechnical studies for New Cairo City extensions and named “Mivida" - Egypt. Therefore, the objective of this context is to study the physical and engineering properties of the foundation beds, as well as their effects on the construction stability, including grain size distribution, free swell, Atterberg limits, direct shear box, and swelling pressure.
Grain size parameters are uniformity coefficient (Cu) and curvature coefficient (Cc) used as principles classification of soil. Uniformity coefficient (Cu) values are ranging from (2.4mm) to (7.05mm), and curvature coefficient (Cc) values are ranging from (0.55mm) to (1.89mm). The studied samples in this study are classified as poorly-graded soil from the point of view of classification engineering geology. The free swell of the studied samples varies between 115% and 180%, liquid limit ranges from 67 to 93%, plastic limit ranges from 22 to 26% and the plasticity index are ranging from 45 to 67. Mechanically, the frictional angle ranges from 30° to 36° and the ultimate bearing capacity for shallow foundation ranges from 616 kN/m2 to 1901 kN/m2 .