Subsurface Geological-Geotechnical 3D Modeling to Evaluate the Geohazard of the Alluvial Soils in Tanta Region, Egypt. GIS Approach

Document Type : Research and Reference

Authors

Geology Department, Faculty of Science, Tanta University, 31527 Tanta Egypt

Abstract

Geological and geotechnical information from 159 borehole in-situ- and lab-based measured plasticity, unconfined
compression, and consolidation parameters for alluvial clays have been analysed. For this analysis, 3D models was prepared using
VOXLER 3 software package. The prime objective was to spatially model the geotechnical variability and to derive the loading
factors along with recognition of the distinctive geotechnical patterns. Results have been presented for the alluvial soils of Tanta
region, Egypt with the principal geotechnical hazards in the main eight districts were identified. Plasticity charts indicated that the
soils are inorganic cohesive highly plastic clays. Geotechnical parameters showed wide ranges evidenced by their large standard
deviations. Al-Mahata and Quhafa areas are characterized by high plasticity soils. Quahafa and beneath Al-Galaa street areas
showed the largest unconfined compression strength. Largest over-consolidation ratio and compression index values were
recorded in Al-Mahata and Al-Emary areas, respectively. High natural water content areas match well with those where water
table is closer to the ground surface in Quhafa and Al-Emary areas. The results of the employed approach can help to establish
geohazard zonation 3D maps with construction favorability for safe urban expansions.

Keywords

Delta Journal of Science
Volume 37, Issue 2
December 2016
Pages 119-132

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