BACK ANALYSIS OF SLOPE FAILURE ON KAMPUNG ILMU AREA, PURWAKARTA REGENCY USING LIMIT EQUILIBRIUM AND FINITE ELEMENT METHODS

• Main Author: Fikri Nur Faizi, Muhammad
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/80228
• Institution: Institut Teknologi Bandung

The “Kampung Ilmu” is an educational area located in the village of Cisarua, Tegalwaru, Purwakarta. After the construction was completed, evidence of cracks in the buildings and deformations in the bore pile due to landslides was discovered. The cause of the landslide was the construction on the lithology of the Jatiluhur Formation’s, which has the property of slaking material when in contact with water or air. This study conducted a back analysis to determine the characteristics of the landslide, landslide parameters, and reinforcement recommendations using the limit equilibrium and finite element methods. The analysis results indicate that the slip surface is located at a depth of 6-8 meters with a translational movement mechanism. The type of the “Kampung Ilmu” landslide is classified as a creeping, with evidence of gentle to steep slope angles, cracks in the building walls, deformations in the bore piles, and movement assessed as relatively slow. The back analysis revealed that the slip surface occurs at the contact between moderately to strongly weathered claystone and slightly weathered to fresh rock claystone with a residual angle of friction of 3.6° and a residual cohesion of 17 kPa. Recommendations for reinforcement include the installation of bore piles at a depth of 12 meters, resulting in a safety factor of 1.59 without seismic load. After reinforcement, the pseudostatic analysis with a probability exceeding 10% and a return period of 50 years yielded a safety factor of 1.17.