Analisis pengaruh kepadatan tanah subgrade dan perkuatan geotekstil terhadap nilai safety factor lereng

Abstract

One of the issues in constructing a structure is the presence of soft subgrade soil. The purpose of this study is to examine the impact of subgrade soil density on slope stability through geotextile reinforcement. The variations of subgrade soil in this research include a 1 m replacement using fill soil, a 2 m replacement using fill soil, a 1 m replacement using fill soil and 1 m using limestone, a 1 m replacement using substitute subgrade soil, a 2 m replacement using substitute subgrade soil, and a 1 m replacement using substitute subgrade soil and 1 m using limestone. The slope stability analysis was conducted using the SLOPE/W program in GeoStudio. The analysis results indicate that the slopes without reinforcement and with variations in subgrade soil density do not yield safe safety factor values. As the subgrade soil becomes weaker, the safety factor decreases. The variation of 1 m replacement using substitute subgrade soil and 1 m using limestone with reinforcement produces the highest safety factor value, which is 1,84.