#TITLE_ALTERNATIVE#

• Main Author: HAMZAH (NIM 12005053), AMINUDIN
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/13242
• Institution: Institut Teknologi Bandung

The objectives of study are to study the geological setting and geological history of study area. Besides that, the objective is to analyze the slope stability that influenced by peak ground acceleration which resulted by the earthquake, especially in the soil of the weathering of lapilli tuff. The studied area is located at the Burangrang Volcano footslopes. The geological history of studied area started at the beginning Upper Pleistocene with deposited of pyroclastics breccias, lava and lapilli tuff which are volcanism product of Burangrang Volcano and ended with deposited of pyroclastics breccias and tuff which are volcanism product of Dano and Tangkubanparahu Volcanoes. The evolutions of geological structures in the studied area at Upper Pleistocene are formed after Burangrang’s volcanism activities. The deposited of volcanic materials and the evolution of structural geology in the studied area made morphology like ridge and hills with steep slopes that have two dominant directions. They are northeast-southwest (NE-SW) and east-west (EW). The slope stability is indicated by factor of safety value. The slope stability beside influenced by material properties of the slope (i.e. density, cohesion and friction angle of the material), it is also influenced by vibrations resulting from the earthquake. The vibrations will reduce shear strength of material and result the decreasing of slope stability. The decreasing of safety factor will affect the slope geometry (i.e. slope angle and height). The value decreasing height of slope for peak ground acceleration 0,15g getting to 40% and for 0,20g getting to 75%. From the result of decreasing height of slope, it can result graphical model. The graphic have line that show limit between the condition of stable slope and the unstable one. The graphical model that has resulted shows exponential negative pattern.