Interface Strength Parameters Analysis BetweenPalangkaraya Sands and Geotextile

ABSTRACT :Soil reinforcement using geotextile is one of geotechnical structures, involving soil-structure interaction. Recently, the problems are solved by neglecting the interface influence between soil and structure. To obtain more realistic shear-strength parameter, it is required to study the soil-structure interface. The study of behavior of soil-geotextile interaction on the shear strength parameters is discussed in this research. The used soils in this research are Palangkaraya sand. The well graded sand has relative density of 90%. The sand sample is based on the maximum dry density (MDD) value obtained from standard Vibrating table test ASTM D 4253. Determination of interface parameter on the shear strength of sand geo-textile is obtained from direct shear test ASTM 3080. The intrinsic interface shear strength parameters are friction angle of interface (δ). The used geotextile types are woven, non-woven and reinforcement. Result of the research gives review on the behavior and interface modeling of soil-geotextile. Values of friction angle of interface (δ) obtained from sandnon-woven geotextile are higher than sand- woven geotextile. The value of δ obtained from sand reinforcement is the highest. Ratio of δ/υ for non-woven geotextile ranges between 0,89~0.93. Ratio of δ/υ for woven geotextile is about 0.81~0.87. Reinforcement ratio of δ/υ is about 0.96 ~ 0.97. The value of δ/υ is relatively constant at residual strength conditions. The interface shear strength parameters are influenced by the roughness of material. Nominal mass, tensile strength and elongation is slightly given influenced concerning shear strength interface parameters. The efficiency as the portion of soil shear strength parameters that is mobilized showing trend are similar to δ and δ/υ.