SYSTEM FOR ESTIMATING IN-SITU ANGLE OF SHEAR RESISTANCE φ_d OF DECOMPOSED GRANITE SOIL

Abstract

In the present study, it was attempted to apply the density-measurement method by using a split-spoon sampler with built-in tube to a decomposed granite soil, and to observe the variations in soil constants economically and accuracy. Dry density ρ_df of a decomposed granite soil sample determined by sand replacement method and that ρ_ds2 determined with the help of a split-spoon sampler with built-in tube were compared to see a close correlation. In the next step, the relationship between angle of shear resistance φ_d and dry density ρ_d of an undisturbed sample of decomposed granite soil was combined with that between ρ_df and ρ_ds2 to formulate a system for estimating in-situ φ_d for decomposed granite soil. This system was proved with accuracy.