낙동강 하구 상부퇴적사질토의 상대밀도와 세립분 함유율에 따른 전단강도와 투수성에 대한 연구

Abstract

This study was a basic research to obtain the knowledge of physical properties of the upper sedimented sandy soil in delta City, located at the Nakdong river. The characteristics of shear strength and permeability to fine content and relative density were also investigated. The upper sedimented sandy soil near paddy and lower soft clay layers showed high percentage of fine content, and the rest area had about 5% of fine content. The specific gravity regardless of depth and location was almost constant. The upper sedimented sandy soil mostly had particle size about 0.1 ~ 0.4mm regardless of sedimentation environment and has illite, a clay mineral, in the entire soil samples. The results of direct shear test on remolded specimens of the upper sedimented sandy soil revealed that the friction angle and cohesion increased with relative density, but its effect was not significant. The fine content was significant, that as increasing it, the friction angle decreased and cohesion increased linearly. The permeability decreased with relative density and fine content, and the permeability of soil containing more than 15% of fine content was independent on the relative density.