2016 年 4 巻 4 号 p. 60-63
An embankment material is generally comprised of the gravel, sand, silt and clay. In particular, the fine grain content (Fc, under sieve #200) affects the mechanical characteristics of an embankment under unsaturated state such as the shear strength and the infiltration at a rainfall. Thus, a series of the constant water content compression tests in this study is performed on the Fc from 10% to 50% using a decomposed granite soil of the embankment. The shear behavior according to the Fc are examined with the degree of saturation. The increase of the shear strength, that is, an apparent cohesion due to the suction on the Fc is also examined through the comparison with the theoretical result based on the Suction stress - SWRC Method (SSM). It could be understood that the effect on the shear strength over Fc= 25% is maximized, and the soil sample over Fc= 25% would have a decided advantage as an embankment material.
