Geological conditions and geotechnical characteristics of young shallow sediments of the southern shore of the Caspian Sea

Articles in Press

Document Type : Research Paper

Authors

1 Department of Civil Engineering, Faculty of Civil and Earth Resources Engineering, Central Tehran Branch, Islamic Azad University

2 Department of Civil Engineering, Faculty of Civil and Earth Resources Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran

Abstract

Global warming and the consequent climate changes have significantly declined the precipitation level in Iran and increased domestic migration to the southern shores of the Caspian Sea. This issue has accelerated construction activities and led to rapid infrastructure development in these areas. The sustainable development requires a comprehensive understanding of geological and geotechnical conditions. The information on geological and engineering properties of shallow soils has wide applications in construction activities and the preparation of geotechnical hazard zoning maps. The study aims to investigate the geological and geotechnical characteristics of young coastal sediments of the southern Caspian Sea basin up to a depth of 30 m using borehole information. To this end, the available boreholes were superimposed on the map of the southern coast of the Caspian. Next, two-dimensional geological sections were drawn manually by correlating the homogeneous layers. The results showed that the coastal shallow soils are mainly Sandy and include four geological layers: poorly graded Sand (SP), Sand with fines (SC/SM), low-plasticity Clay (CL), and Gravel layer (G). Based on the obtained results, the grain size of the sediments shows a clear relationship with the width and slope of the coastal plain. In this respect, fine-grained sediments are often more abundant on the eastern coast than on the central-western coast. Finally, the geotechnical characteristics of each layer, including Atterberg limits (LL and PL), consolidation, undrained shear strength, and drained shear strength, were calculated by analyzing the results of the laboratory tests conducted on the samples obtained from different depths.

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Article Title [Persian]

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Geopersia

Articles in Press, Accepted Manuscript
Available Online from 29 December 2024

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History

  • Receive Date: 16 August 2024
  • Revise Date: 18 October 2024
  • Accept Date: 29 December 2024

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