Tri Datu Model Slope Stability in Collaboration with Community Based Hydroseeding (Case Study: Songan Villages A and B Kintamani)

Abstract

. Landslide disaster is one of the events that often occurs in northern and eastern Bali, especially in Songan A and B Kintamani villages as happened on February 9, 2017 which claimed lives. Landslide consists of two parts, namely the slip plane soil and the transition layer soil. One way to characterize soil properties is to use geotechnical methods. Five slopes that have the potential for landslides in Songan A Village (dsa1, dsa2) and Songan B Village (dsb1, dsb2, dsb3), Kintamani District, Bangli Regency, and were characterized using geotechnical methods to identify the physical magnitude of slip plane soil and transition soil layers. The results of the characterization of soil physical properties such as cohesion, shear angle, density and slope geometry were analyzed for slope stability using the Fellenius method manually. This study uses a quantitative approach, in collecting data using survey methods and sampling. To determine the value of the factor of safety (FK) using the manual Fellenius method. The existing data is processed and analyzed so that the value of the recommended safety factor is obtained. Based on the safety factor research for existing slopes by reducing the soil mass of each slope sequentially, the results are 1.45 and 5.02 m³, 1.35 and 4.49 m³, 1.36 and 1.68 m³, 1, 13 and 3 79 m³, 1.20 and 7.54 m³ on the five slopes (FK <1.5) if a landslide occurs, the landslide will cover roads and houses. From the results of the characterization, mitigation is carried out in the form of slope arrangement of the Tri Datu Model in collaboration with community-based Hydroseeding. .93 and 16.40 m³, 2.34 and 3.18 m³, 1.65 and 9.19 m³, 1.52 and 9.8 m³ all values ​​of the factor of safety of the slopes (FK >1.5).