Behavior of Saturated Volcanic Soil Slopes with Grass Roots Under Seismic Response

Sinarta, I. Nengah and Aryastana, Putu and Candrayana, Kadek Windy and Agung Sudewa, I. Ketut (2024) Behavior of Saturated Volcanic Soil Slopes with Grass Roots Under Seismic Response. International Review of Civil Engineering (IRECE), 15 (6). pp. 547-555. ISSN 2036-9913

Text 25683-61121-1-PB, Vol 15, No 6 (2024) (IRECE TERBIT 09.04.2025).pdf Download (1MB)

Abstract

Landslides on mountain slopes triggered by rainfall and earthquakes pose a significant risk to the slopes on Bali Island. This study examines the behavior of saturated volcanic soil reinforced with a combination of elephant grass and vetiver roots under earthquake forces. The methodology includes triaxial testing on vegetated soil and model testing to assess the reduction in landslide-prone areas due to vegetation. Triaxial test results indicated increased soil cohesion and internal friction angle when reinforced with vetiver and elephant grassroots. Cohesion in nonvegetated soil was measured at 0.20 kg/cm2, which increased to 0.65 kg/cm2 with root reinforcement. Model testing results aligned with consolidated undrained triaxial tests, demonstrating that the combination of vetiver and elephant grass reduced the landslide area by up to 64.1% on 45-degree slopes and up to 52.1% on 60-degree slopes.

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