Studi Prilaku Timbunan dengan dan Tanpa Geotekstil dengan Variasi Kekuatan Tanah Dasar dan Kekakuan Geotekstil

Abstract

This thesis aim to find change of behavior of embankment with or without geotextiles. Change of behavior perceived for the variation of strength of base soil and variation of axial stiffness of geotextiles. Result of from this study is expected can be used as basic information to using geotextiles with certain axial stiffness for soil embankment with certain strength. Analysis only conducted at embankment with same geometric for embankment without and with reinforcement. Ground water surface level resides at soil surface. Filling soil use model of Mohr-Coulomb while embankment soil use model of MohrCoulomb and model of Soft Soil with soil parameter to be compared to beforehand. Geotextile placed on the surface of base soil flattening before loading. Variation of geotextile only at value of axial stiffness (EA) according to requirement of program of Plaxis used. From result of research obtained conclusion that to find the soil parameter between Model Mohr-Coulomb and Model of Soft Soil by using simulation oftriaxial test in Program Plaxis not yet given good result of which either due election of soil parameter only by trial and error and result compared only graphically. Usage of geotextile will be able to heighten embankment, but this is matter very related to stiffness ratio between materials of geotextile with base soil. Usage of geotextile gives contribution only at condition near to collapse. At early condition contribution of geotextil relative do not seen. Changes of excess pore water pressure not give improvement pattern and dissipation especially at model of Mohr-Coulomb. While for the model of Soft Soil pressure dissipation of excess pore water pressure seen for embankment with geotextile. Tension pressure which mobilized at geotextil resulted by distribute to base soil deformation through interface. Because of biggest deformation happened around tip of embankment hence biggest tension mobilization happened at around tip of embankment. Furthermore research which more comprehensive with enough parameter variation is needed to obtain by clearer information regarding of geotextile behavior as reinforcement of embankment. Continuation researches have to conduct modeling with embankment to collapse and compared to analysis of FEM