GIS-BASED GEOTECHNICAL MAPPING USING ANALYTIC HIERARCHY PROCESS:

Abstract

Geographic Information System (GIS) can integrate and relate any data with a spatial component regardless of the source of data. It's easy to store, retrieve, manage and analyze geotechnical data. In this study Geotechnical field was chosen because Sodo governorates lack studies in this field. Given that there is a large quantity of data in hard copy format which is difficult to handle without the implementation of GIS. Thus Sodo City has been selected as case study. This project aims to investigate the development of a Geographic Information System (GIS) to better collect, manage, analyze and visualize soils data which obtained from boreholes test results collected from 21 boreholes 7 is primary data and the rest is secondary. The methodology applied is divided into several stages including data compilation and editing, preparing data for analysis, archiving, analyzing and presentation. Most geotechnical problems such as bearing capacity, lateral earth pressure and slope stability are related to the shear strength of a soil. The shear strength of a soil can be related to the stress state of the soil. The stress state variables generally used for an unsaturated soil are the net normal stress (σ -ua) and the matric suction. (Ua- Uw).The index properties of soils are also essential parameters for soil classification as well as for indirect estimation of its potential strength.

This project presents the results of soil logs (2D or 3D logs) and their engineering properties for any specific location that may be chosen. Models, sections, profiles and fences can also be obtained. In addition to Maps as bearing capacity, water content, type of foundation, excavation depth and lithology planer map at any depth can be created through employing GIS technology. Finally, the project provides engineers with the necessary geotechnical information for designing construction in the different projects as buildings, towers and roads.Keywords: archiving, analyzing, boreholes, GIS, Sodo City