Upaya Stabilisasi Lereng Dengan Pendekatan Geotekstil Eco-Slopes

Abstract

During the rainy season, various disasters occur in Indonesia, one of which is landslides. As happened in the geological area of the Karangsambung nature reserve, Kebumen Regency, Central Java. The area has unique geological characteristics and is dominated by slopes that have a high potential for landslides. The movement of avalanches generally gets bigger or faster if the rainfall is getting higher. The purpose of this study was to determine the cause of landslides and appropriate countermeasures to prevent the occurrence of landslides. Field investigations and laboratory tests were used to determine soil characteristics which were then analyzed using the infinite element method to calculate the slope factor of safety (Fs). Based on the laboratory test, it was found that the cohesion value and low shear angle indicated a low bearing capacity of the soil. Based on the investigation, it was found that the groundwater level is at an elevation of 0.00 m or ground level. At a groundwater level of 0.00 m, the Fs value of 0.50 Fs value < 1 is categorized as unsafe. The groundwater level was lowered to a depth of 3.00 m, obtained Fs > 1.3, and categorized as safe. The decrease in groundwater level on the slopes is planned with a French drainage system that uses geotextiles. The geotextile that will be used also involves vetiver/vetiver grass as a conservation effort, locking the soil and simultaneously channeling water in the soil out through evaporation.