three-dimensional slope stability evaluation under seismic load (Case studi: Balaroa, Central of Sulawesi)
Rahmat Yusup Borman (a*), Busthan Azikin (b), and Hendra Pachri (b)

Departmen of Geological Engineering, Faculty of Engineering, Hasanuddin University
Jalan Poros Malino Km. 6, Gowa, Indonesia

Abstract

The 2018 Mw 7,4 Palu earthquake was one of the largest natural disasters that has ever occurred in Indonesia. This earthquake were also triggered and followed by a large mass movement in Balaroa area. This earthquake-triggered disaster causes extensive damage to infrastructure and a huge loss of life. Slope stability evaluation under seismic conditions was one of the best solutions to prevent and mitigate the impact of the disaster. . The objective of this study was to investigate the distribution of the safety factor under the Mw 7,4 Palu earthquake condition that causes a large mass movement in Balaroa. The research methodology of the analysis is based on three-dimensional stability analysis under seismic condition using Plaxis 3D LE software. The input variables used in this research were the study area 3D modeling, soil parameters, groundwater condition, and seismic load coefficient. The result of this research shows the distribution of the safety factor along the study area with seismic and non-seismic conditions. By the distribution of the safety factor result in this area spesifies the minimum value of the safety factor that triggered a massive mass movement. In accordance to that, this safety factor value can be used in other potential areas with the same geological condition as the study area.

Keywords: Slope stability, seismic load, three dimensional analysis, safety factor

Topic: Hydrology, hydrogeology, and geology engineering