DELINEATION OF GEOTECHNICAL PARAMETERS USING SHALLOW SEISMIC AND ENGINEERING GEOLOGY AT LAND OF COUNCIL OF NATIONAL DEFENSE 6TH OCTOBER CITY – EGYPT.

The combination of geophysical data and geotechnical measurements may greatly improve the quality of buildings under construction in civil engineering. The geologic setting and physical and dynamic properties of foundation beds are playing a crucial role in the stability of building, especially in case of the subjection of building to dynamic forces associated with the earthquake occurrence. This research involves geotechnical and shallow seismic refraction for foundation beds at Land of Council of National Defense 6th October City. The shallow seismic refraction technique was also used to evaluate the foundation rock properties in the area by recording the first arrival time of seismic waves and their interpretation in terms of subsurface geoseismic layers and their physical and dynamic properties. The ultimate bearing capacity in the second layer has value ranging between 2876 gm/cm2and 10643gm/cm2, the allowable bearing capacity in the second layer is between 959gm/cm2, to 3842 gm/cm2 and hence the factor of safety is equal 3, this indicates that the bed rock can be classified as cohesive soil. Chemical analysis results reveal content of sulfates and chlorides indicate that most the studied samples are non-aggressive and some samples are moderately aggressive. 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 .