GEOTECHNICAL PROPERTIES OF BAHMANSHIR SERIES, SOUTHWEST KHUZESTAN, IRAN*

Document Type: Research Note

Authors

1 Department of Geology, University of Tarbiat Modares, Tehran, I. R. of Iran

2 Department of Geology, University of Shahrood, Shahrood, I. R. of Iran

3 Department of Geology, University of Tehran, Tehran, I. R. of Iran

Abstract

Holocene in Southwest Khuzestan is represented by a fluvio-tidal succession termed the
Bahmanshir Series which consists of two clayey layers separated by silty sand to silt beds. This paper
describes the geotechnical properties of the clayey layers that have wide exposure in the lowlands of the
Persian Gulf coast. Studied layers are generally clay sized and consist of a lesser percentage of clay minerals.
Most of the clayey layers have intermediate plasticity, and low potential for expansion. The variation of
physical and engineering properties of the layers from base to top and along the Bahmanshir River is
investigated in this research. The engineering properties of the beds seem to be affected by tidal and river
flow currents and totally by their formation sedimentary environments. Links of the geotechnical data with
geological features as formation sources in the upstream of the basin, the cementation due to the capillary
feature in the floodplain sub-environment and the flocculated texture of clays in the brackish water, have been discussed in this paper. Overall, it is observed that the geotechnical data could be correlated with the
geological features of the Bahmanshir Series.

Keywords