ANALYSIS OF WEDGE LANDSLIDE POTENTIAL AND IT’S REINFORCEMENT METHOD; CASE STUDY ON KM 54 – 59 TAWAELI-TOBOLI ROAD SEGMENT, PARIGI MOUTONG REGENCY, CENTRAL SULAWESI

• Main Author: KESUMANINGTYAS (NIM: 22014031), ARIF
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25768
• Institution: Institut Teknologi Bandung

<p align="justify">The national road segment of the Tawaeli-Toboli is a very important road for the region in the western and eastern of Sulawesi Island. On the road slopes, schist amfibol and gneiss with many discontinuities can be find at the slope along the road. The discontinuity on the slope of the road segment can be come sliding surface, including wedge landslide. The potential of wedge landslide occurs on slopes if have at least 2 intersecting of joints and on the slopes that followed by large displacement volumes of rock block. Methods of rock mass classification such as RMR, GSI, and CSMR are used to determining rock mass class and recommendations of reinforcement. The results of the analysis RMR obtained values 34–60,5 (class II. Good–IV. Bad) and analysis GSI obtained values 43,3–57,9 with blocks of rock form Very Blocky-Blocky and surface conditions Poor-Fair. Result of SMR analysis obtained value 27,7-46,6 with class III (bad)-IV (normal) and CSMR analysis obtained value 26,2-44,9 with class III (bad)-IV (normal). Rock mass strength and shear strength of the discontinuity become input data in the calculation of the safety factor and probability of failure with limit equilibrium method. Safety limit of safety factor is 1.5 and probability of failure is 5%. Result of analysis represent LB-01 and LB-02 slopes has a safety factor value and probability of failure is above the safety limit. LB-04 slope has a safety factor value slightly above the safety limit, but probability of failure is below the safety limit. LB-03 slope has a safety factor value and probability of failure is below the safety limit. The results of sensitivity show the discontinuity component in the wedge wedge system affecting the safety factor and probability of failure is internal friction angle (&#61542;) and cohesion (c). Optimization of reinforcement methods for slope stabilization can be do with reducing driving force (cutting or slope increment) and increase retaining force (rock bolt and concrete).<p align="justify">