Abstract
A newly developed Self Boring In situ Friction Test (SBIFT), is presented. As a multi-purpose technique, it is aimed to evaluate soil/soil-structure strength, coefficient of subgrade shear reaction, deformation moduli and earth pressure at rest. Firstly, the device is introduced. Then theoretical background for interpretations required is discussed. Examination tests in the laboratory with the probe of SBIFT were conducted to investigate the technique's reliability. And, in situ SBIFT in various soils were conducted and compared with other tests' results. The conclusions are that the friction strength, subgrade shear reaction coefficient and deformation modulus can be interpreted, and the earth pressure at rest be possibly interpreted by SBIFT.
