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

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.

Abood MY, Aljanabi KR, Sayl K. Using GIS Tools for the Prediction of Bearing Capacity of shallow footing (qu)and Undrained Shear Strength (Su) values for Falluja City's Soils. Salud, Ciencia y Tecnología - Serie de Conferencias.

“…(4) In order to effectively handle the design consequences of land utilization in expanding urban areas, it is imperative to conduct a comprehensive analysis and accurate evaluation of the spatial diversification of geological and geotechnical characteristics of soils and groundwater. (5,6,7) The conventional method of acquiring data in the field of geotechnical practice can often be a timeconsuming endeavor. There are preexisting sources of data available, encompassing maps, reports from site inspections, instructions, and even various forms of media, whether in electronic or physical form, that can be amalgamated.…”

Geotechnical database building and 3D modeling of the soil in Medina, Saudi Arabia

“…These can help anticipate unforeseen soil characteristics not only for design and economy but also for construction techniques. Unraveling the accurate soil spatial geotechnical variability is imperative in optimum cost, time, and safety and efficient setting of hazard mitigation measures that can play a decisive role to help efficient land suitability prioritization and land use management for future urban expansion projects (e.g., Das 2005;CGS 2006;Hack et al 2006;De Rienzo, et al 2008;Kolat, et al 2012;Masoud 2015;Masoud, et al 2016). This urges the use of a multidisciplinary and 3D modeling approach that can integrate the multivariate statistical and the geostatistical techniques.…”