Determination of Diameter of Belled Shafts with respect to Uplift Forces Resulted From Expansive Soil Layer in Active Zone

Expansive soils are found in many parts of the world that especially arid and semi-arid regions. They have caused several damages lightweight structures for decades. For this reason, a more suitable foundation type should be selected designed built on these soils. example, application belled shaft at expansive soil layer is preferable method practice. However, one worst cases design accepted swelling placed active zone. Therefore, condition taken into account process foundation. In study, diameter was separately determined with respect to some factors such as shaft, depth zone, friction angle between soil, ratio undrained cohesion stable zone pressure calculation process, four different diameters 0.3 m, 0. 45 0.60 0.75 m were utilized. Also started from 1.5 15 specified. To sum up, optimum 0.45 m.