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    Effect of uncertainties of soil strength parameters on the reliability of foundation behavior
    (İstanbul Gedik Üniversitesi, 2024) Sulaiman, Omar Muttlaq Sulaiman; Ulutagay, Gözde
    Since the soil characteristics may vary within a specified zone therefore for a geotechnical engineering projects the uncertainty is something unavoidable. For this reason the factor of safety is to be used in deterministic approach that determined the uncertainty related with soil of such characteristics. The amount and sources of uncertainty is not to be considered in the deterministic approach. Through the use of deterministic approach the limit case design is non-predictable. Therefore it is more logical to study the probability of failure. During this topic the procedures of the uncertainty analysis of the bearing capacity of foundation located on soil supported by stone columns or by the soil replacement ways using granular material is to be explained. The analysis requires the definition of the standard deviation of undrained shear strength and the internal angle of friction of the stone and the soil surrounding the stone. The point estimation method that in it the amount of capacity and standard deviation to be calculated. The current topic procedure is an extension of the point estimation method. Tests implemented on 21 models as a two groups on models of soft clay of variable values of undrained shear strength (Cu) ranging from 8 to 18 kpa. The first group of eight models of soil replacement located at variable depth and width, the second group of twelve models of stone columns with single column, two column group, three column group, four column group, five column group and six column group. The last model is of un enhanced soil (untreated soil). A portable vane shear device used for calculating the undrained shear strength before and after the occurring of the failure of the model. It appeared that the undrained shear strength of the stone column increased from (5.6-20) % because of the use and the construction of the stone columns. For the models of footing resting on replaced soil partially (using granular materials) the undrained shear strength increased from (5.5-15) % because of soil replacement. Through the implementing of two non-liner models by the use of a (statistical analysis program SPSS) an analysis performed for the experimental data and for the ex-studies in order to form a bearing capacity equation for the floating and end bearing stone columns group. The conclusion is that for a single column or for column within group at a given factor of safety the failure probability still the same, by the increasing the safety factor the reliability index increases for both ways of enhancement (stone column and soil replacement) and by the increasing of safety factor the failure probability decreases.