Geotechnical and geochemical characteristics of Obhor sub-soil

Abstract EN

The geotechnical and geochemical characteristics of the subsoil over an area of about 90 km2 in and around Obhor a re described.

Five soil unit s and three rock units with differing characteristics have been identified in the arc a within a maximum depth of 15m.

These units a re (I) the soft grey clay.

(2) the stiff brown clay, (3) the very loose silty sand, (4) the very loose carbonate silty sand, (5) the medium carbonate gravelly sand .

(6) the weak coralline limestone.

(7) the Tertiary to Quaternary basalt and (8) the Tertiary sandstone and claystone.

Based on the location of these units.

the area has been divided into seven zones.

three of which show the characteristics of coastal sabkha.

Chemical composition suggests the unit s 1,4 and 5 to be derived from coralline limestone whereas the units 2 and 3 to be of continental origin.

Protective measures are found to be necessary for concrete and steel due to aggressive ground condition.