Abstract
The earthquake on September 28, 2018 in Palu city triggered liquefaction. The liquefaction affected several areas, including Balaroa. Some parts in Balaroa experienced landslide such as the road section which formed the slope. The purpose of this study was to identify the potential of landslides due to liquefaction in Balaroa road section based on numerical modeling using the limit equalibrium method. This study was conducted in Balaroa, West Palu sub district, Palu City, Central Sulawesi Province. The slope stability analysis modelled three locations prone to landslides using the limit equalibrium method assisted by Slide 7.0 program. The results showed the safety factor value of hose three locations in Balora road section using methods of Ordinary, Bishop and Janbu was FS<1. It indicated that the slope is in unsafe condition and vulnerable to lanslides, therefore the government should take this study into consideration.
Highlights
Land mass movement or landslide is one of the most common natural disaster in Indonesia, in Central Sulawesi province including Palu City
The limit equilibrium method applied the concept of the safety factor value (SF) in analyzing the modeling of 3 points of existing slope conditions that are prone to landslides
The slope stablity analysis used the limit equalibrium method to obtain the safety factor values which were considered by the Ordinary method, the Bishop method and the Janbu method by modeling 3 existing slopes on the Balaroa road section that is prone to landslides
Summary
Land mass movement or landslide is one of the most common natural disaster in Indonesia, in Central Sulawesi province including Palu City. The landslide hazard level of Palu City is in the high category with a score of 23.7 [1]. The occurence of landslides are usually caused by several factors including high rainfall, human activities such as the construction of houses by cutting slope foot, earthquake seismic activity, weathering of rocks, etc. Balaroa consists of 85% plains and 15% hills, it is considered as a densely populated area. The 7.4 SR earthquake on September 28th, 2018, struck Balaroa and caused the occurence of liquefaction. The road section is located on a hilly topography, the landslide forms an increasingly steeper slope which has a very high level of vulnerability of landslide hazards
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