Abstract:

In this study, an analysis of deep soil mixing method, which is applied in the improvement of the foundation soil of a residential type building in the central district of Amasya province, was carried out. The deep soil mixing method is based on the mixing of additives (binder) by injecting into existing problematic soils by means of various mechanical shafts.It is generally applied in cohesionless soils to increase bearing capacity, to reduce settlement and liquefaction potential. In this study, deep soil mixing columns with 80 cm diameter and 15.00 meters length were designed for the foundation soil, in which bearing capacity and liquefaction problems were expected. The ultimate bearing capacity for the deep mixing column was determined according to the results obtained from the static axial loading test conducted in the field, by using some widely used methods in literature, whose names are the Brinch Hansen 80%, Chin Kondner, Decourt, Mazurkieicz and Hirany Kulhawy. In addition, the carrying capacity of a single deep mixing column was estimated with the help of Plaxis 3D Foundation finite element software modelling. As a result, Mazurkieicz method gave the closest result to the theoretically calculated bearing capacity value. On the other hand, in Brinch-Hansen 80% method, the obtained bearing capacity was low.

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