Abstract
The majority of Magelang Regency is considered as intermediate and high susceptible areas against landslide. As happened in Baleagung Village in January 2018, a landslide has damaged local residency buildings. The landslide occurred because of high-intensity rainfall on the day before. Meanwhile, cracks formed in several areas that were indicated by the slope around the village were still actively moving. Therefore, mitigation is urgently needed to minimize the risk of further landslide movement. This study aimed to analyze the mechanism of ground movement at Baleagung Village which was affected by rainfall. This research was conducted by using back-analysis method to determine the initial groundwater level conditions and its effect on the slope stability. Soil parameters were obtained by laboratory testing and permeability tests in the field. Subsequently, rainfall data was collected from Himawari-8 satellite and used as the data input parameter for numerical analysis using SEEP/W and SLOPE/W. The results obtained from back-analysis showed that rainfall infiltration into the soil affected the degradation of safety factor value that was caused by the increase of pore-water pressure and the decrease of effective stress in a certain period. The degradation of safety factor was caused by the increasing of soil saturation degree when water infiltrated into the ground.
Highlights
As the most populous region in Indonesia, Java Island frequently suffers from landslide that had caused a tremendous amount of damage both on human life and material loss
Back analysis was determined by changing the shear strength parameters, such as, cohesion, and internal friction, and initial groundwater level condition, to get the value of Safety Factor (SF) ≈ 1.00
According to the results of analysis, it can be concluded that the rainfall wetting could affect the slope stability
Summary
As the most populous region in Indonesia, Java Island frequently suffers from landslide that had caused a tremendous amount of damage both on human life and material loss. According to PVMBG (Centre of Volcanology and Geological Hazard Mitigation) records, the majority area of Java Island is vulnerable to landslide, especially Magelang Regency, where most of the areas are categorized as intermediate and high susceptibility zone [1]. The village is located at Grabag District, 20 kilometers away from the district capital city Magelang, Central Java Province. It is geographically situated at 110° 18' 19" E and 7° 23' 32.3" S. Kupen Sub-village is part of Baleagung Village, Magelang Regency, and its residents live surrounding the area at the base of the hill (Figure 1). Most of the areas are hills, which lead the sub-village prone to landslides
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