Saha deneylerinden killerin sıkışabilirliğinin belirlenmesi.

The objective of this thesis is to establish an understanding regarding the estimations of commonly used geotechnical soil parameters from in situ tests. In order to determine the profile, strength and deformability of soils in a project site, execution of site investigation studies consisting borehole drilling, in - situ and laboratory testing are a must. In – situ testing of soils has become growingly popular during site investigations especially for being practical and economic. Hence, estimations of geotechnical parameters from in – situ test results hold a significant place in the geotechnical design practice. In the content of this study, reasonability and accuracy of the widely used emprical correlations about the estimation of undrained shear strength and coefficient of volume compressibility of cohesive soils from in – situ tests were evaluated. In addition, direct correlations between some of the in – situ test parameters were also discussed in order to determine the applicability of such relationships. For this purpose, the data of five extensive site investigation studies performed in mostly cohesive soils from Turkey and Europe were compiled and analyzed in a detailed manner. In – situ testing database is consisted of “ Standard Penetration Test”, “Cone Penetration Test”, “Pressuremeter Test” and “Flat Dilatometer Test” In – situ test parameters were evaluated together with the results of laboratory tests performed on the samples obtained during site investigation studies. According to the comparison of results with the studies in the literature, a general agreement was observed especially for the cases of similar soil conditionsM.S. - Master of Scienc