Describe the Geophysical Profileof Borings

The variation in the thickness of the soil stratum for engineering application is known as the geophysical profile. Figure 1.2 shows a typical geophysical profile. Hence, it is not possible  to locate this profile in accordance with a rigid pattern of spacing of the bore holes. It must be located such that, you are in a position to obtain this necessary data for the completion of the general geological survey. This will also assist in planning of  the further detailed exploration programme. If  the soil conditions are uniform, a spacing of 120 m to 150 m for the borings may be adopted. A regular spacing of 30 m or one bore hole for every 1000  sq. metre of area may be adopted.