Correlation of Embankment Density Degree with Slopes Landslides Safety Factor

Abstract

The purpose of this study was to find the relationship between density D and safety factor SF of the embankment against landslides. If the relation between D and SF is known, then we could simplify the slope stability calculation. The safety factor against landslides could be determined by only entering the degree of density. Calculation of slope stability does not need to be done repeatedly for every given of density degree. In addition, the results of this study can also be used to determine the minimum density level that must be prepared to obtain safety factor number that are still within the allowable safety number limits. The safety factor for landslides is calculated by the Simplified Bishop Method. The required soil parameter data are the value of   and c, which are obtained from the soil testing results in the laboratory. The method that will be used in this study is by conducting a series of density and soil shear strength tests in the laboratory, to obtain the soil parameters needed as data in analyzing the relationship between D and SF. First, a standard compaction test is carried out on samples that have been prepared, to get the maximum dry density (d maks). Then the samples are made with different density degrees D, then conducting direct shear test to get the appropriate values of c and . The soil parameters obtained from the test results in this laboratory are used to determine the safety factor SF based on the Simplyfied Bhisop equation using Geo-5 program. Furthermore, variations in SF values with D were analyzed statistically to obtain a relationship between D and SF. The slope stability calculation with Geo-5 program, shows that there is an increase in safety factor SF against landslides, with increasing degrees of density D. In other words, it can also be said that between D and SF are linearly related. The relationship between D and SF is expressed by SF = 0.033 D -2.215, where D value is expressed in percent.