Analysis of Andesite Rock Slope Stability with Bishop Method

Abstract

Landslides are caused by disruption of the soil’s degree of stability. When a slope’s pushing force exceeds its restraining force, a land slide will result. Moreover, at Human activities, climate change and natural influences can disrupt the stability of the soil and rocks on slopes. Disruption of the level of soil stability causes landslides. A landslide occurs due to the driving force on the slope being greater than the resisting force of the slope. To prevent landslide, a slope stability analysis is necessary. Moreover, the research site tends to produce a gravitational force that moves the soil mass towards a higher surface. This occurs as a result of due to the area’s topography of the area, which has different elevations varying from gentle to step but however, the research location is an andesite rock mining located in Peseng Village, Gerung District, West Lombok Regency, West Nusa Tenggara. The slope stability is required to reveal the shear strength of the slope and its safety factor. The analysis was conducted by using a survey, especially a field method. The field method used was the Bishop method with 2D Slide Program Software. Based on the results of laboratory testing, the value of the bulk weight (ү) is 18.21 kN/m3, dry weight 18.14 kN/m3, wet weight 18.53 phi (Φ) is 13.50° and cohesion (c) is 136.8 kN/m3.