Engineering - hydrogeological model of land subsidence area in the southwest of Tehran (Tehran – Shahriyar plain)

Document Type : Original Article

Authors

1 PhD Student, Department of Engineering Gology, Tarbiat Modares University.

2 Professor, Department of Engineering Gology, Tarbiat Modares University,

3 Assistant professor, Department of Engineering Geology, Tarbiat Modares University, nikudelm@modares.ac.ir

4 Associate Professor, Earth Sceince Research Institute, Geological Survey of Iran.

Abstract

Land subsidence is an important geological hazard closely related with the development of urban areas. Intensive groundwater extraction attributed to economic development, and population growth has been identified as the main cause of land subsidence in many cities worldwide, especially those in densely populated and economically developed urban areas. The first step in fundamental studies of this phenomenon is the preparation of the engineering - hydrogeological model. This model is a pictorial representation of the hydrogeological units and their boundaries, physical and mechanical characteristics.
For separation and correlation of soil layers is used the geological logs data and their geotechnical characteristics (atterberg limits, unified soil classification and shear wave velocity). Elastic constants of soil layers (shear modulus, young,s modulus, bulk modulus and passion,s ratio) based on the estimated density and conventional empirical formulas are obtained. Then, the layers that have similar characteristics in an engineering geological unit are defined. Based on this model, a multi-layered aquifer system in southwest plain of Tehran includes three aquifer units and three aquitard units. This study shows that the heterogeneity of soil layers is high. This feature will change from one region to another (Shahriyar-Tehran plain, Shahriyar to Eslamshahr).

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References

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Scientific Quarterly Journal of Iranian Association of Engineering Geology
Volume 9, Number 3 & 4
March 2016
Pages 1-17

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History

  • Receive Date: 01 February 2015
  • Revise Date: 19 March 2016
  • Accept Date: 28 September 2016

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