Abstract
In this study, we evaluated the relationship between pF value and shear strength in compacted and unsaturated decomposed granite soils depended on the different weathering. Three kinds of decomposed granite soils were used for the tests. The shear strength was measured by the direct shear testing apparatus. pF value was measured by the automatic recording tensiometer.
Firstly, we evaluated the relationship between water content and the shear strength. The shear strength related to the water content was depended on the, weathering of materials.
Next, we used pF value instead of the water content, and we evaluated the relationship between pF value and shear strength. The shear strength related to pF value could be evaluated by independently from the weathering of the materials. All pF values corresponded to the changing point of shear strength were approximately 2.5.
