Şanlıurfa'daki bazı geoteknik özelliklerin CBS kullanılarak değerlendirilmesi

Geographic Information Systems (GIS) is a database that offers functions such as analyzing geographic data, querying, statistical analysis, visualization, and spatial analysis. GIS is an important tool for zoning and settlement planning, allowing for more effective examination, research, interpretation, conclusion, and data planning. In this thesis, the goal is to minimize soil-related risks using databases and geotechnical maps created with GIS. The study utilizes geotechnical survey reports, field and laboratory test results obtained from the archives of the Şanlıurfa Municipality Directorate of Planning and Urbanization. Geographical information system methods were used to analyze geological, geophysical, and geotechnical data from 535 drilling points within the borders of Şanlıurfa Central District. Soil properties were examined in different regions of the study area, focusing on rock quality designation (RQD), compression (Vp) and shear wave (Vs) velocities, poisson ratio (υ), seismic velocity ratio (Vp/Vs), unconfined compression strength (UCS), density (ρ), maximum shear modulus (Gmax), dynamic elastic modulus (Ed), and bulk modulus (K). Maps of the study area were created using the Inverse Distance Weighted Method (IDW) and the ArcGIS software, enabling more effective and efficient use of geotechnical data in engineering studies. The study shows that the neighborhoods of Çamlıyayla, Direkli, and Ahmet Yesevi have high rock quality designation, reaching up to 19.71%. The soil density in the central district of Şanlıurfa varies between 1.67 and 2.03 g/cm3. The lowest shear wave velocity values are found in the western part of the study area and in Atakent, Çamlıyayla, and Güllübağ neighborhoods, ranging from 469 to 721 m/sec. The Vp/Vs ratio in the southeastern part of Şanlıurfa's central district, particularly in Direkli and Ahmet Yesevi neighborhoods, ranges from 1.83 to 2.12. Unconfined compression strength throughout the central district of Şanlıurfa varies between 1.66 MPa and 10.29 MPa. The study highlights the high rock strength in the southeastern region, with the eastern region exhibiting very high rock strength. Key Words: Şanlıurfa, geotechnics, shear wave velocity, unconfined compression strength, GIS, mapping.