SLOPE STABILITY ANALYSIS TOWARDS TOPPLING FAILURE POTENTIAL ON THE ROAD SECTION OF TAWAELI-TOBOLI IN KM 42 - KM 52, CENTRAL SULAWESI

• Main Author: (NIM: 22013012), MASRI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/28793
• Institution: Institut Teknologi Bandung

<p align="justify">Discontinuity plane on the slope along the road Tawaeli Toboli KM-42-52 could be a weak plane which can stimulate landslide, including toppling failure type. Toppling failure can be occured in a single block which produces rockfall and can beoccured in the rock mass that followed a large volume of rock mass displacement. The empirical method such as Slope Mass Rating classification provides a fairly conservative assessment of the potential landslides evaluation and this method does not consider resisting force and driving force that working on slopes and functions of the stress-strain slope materials. Therefore, slope stability analysis for toppling failure needs to be comprehensive by using empirical methods, analytical methods, and numerical methods. A more comprehensive analysis is expected to give a more optimal slope stabilization. <br /> <br /> <br /> Scanline survey contains a detailed quantitative description of discontinuities in the amphibole schist and quartz gneiss along slopes. Scanline attribute is not only used to define parameters in rock mass classification, but also used to determine rock mass strength parameter and shear strength parameters of discontinuities. Both of these parameters into the input in the calculation of the factor of safety and the probability of failure using limit equilibrium method and finite element method. The probability of failure is the spatial variability function of the factor of safety and it is obtained through Monte Carlo simulations and Point Estimated Method (PEM). The analysis showed that TP-04 slope had a factor of safety below the threshold limit value, while the TP-01 slope had a probabilistic of failure exceeds the threshold limit value. Results of the sensitivity analysis and back analysis showed that component discontinuities in the block toppling system that significantly affect the stability of the slope were the base joint friction angle (&#61542;b) and block toppling cohesion (ct). Slope stability system optimization was performed by reducing the driving force (by re-excavation or benching slopes), increasing resisting force (by using retaining wall, rockbolts, and shotcrete), and protecting against rockfall (by using toe ditch and/or wire mesh).<p align="justify">