Evaluation of andesite slopes stability using pseudostatic limit equilibrium method in Lembang active fault zone, West Java, Indonesia

Wira Cakrabuana, Imam Achmad Sadisun, Adrin Tohari, Indra Andra Dinata, Mudrik Rahmawan Daryono, Rendy Dwi Kartiko, Antonina Pri Martireni, Koko Hermawan, Hasan Tri Atmojo

Abstract


Earthquakes and rainfall can trigger landslides in many regions of Indonesia. Rock slopes of andesite outcrops in Gunung Batu and Graha Puspa areas coincide with the Lembang active fault zone in West Java. The region is also subjected to high-intensity rainfall. Thus, the rock slopes are prone to failure during earthquake shaking and heavy rainfall. To mitigate the hazards associated with slope failure in residential areas close to the rock slopes, it is necessary to assess the slope failure hazard at the andesite hill slopes. The study presented in this paper aims to analyse the stability of the andesite slopes using the pseudostatic limit equilibrium method and evaluate the effect of variations of regional seismicity and water content on the stability of the slopes. Pseudostatic analysis considered the peak ground acceleration (PGA) and the calculated horizontal seismic coefficient (kh). The limit equilibrium method was focused on toppling and wedge failure cases. Based on the analysis, the andesite slopes in Gunung Batu and Graha Puspa are stable (FoS ≥ 1.1) in factual conditions (dry-static). In contrast, all slopes have the lowest FoS values (less stable-unstable) under the saturated-pseudostatic conditions. The threshold values of kh and %w (percent water fill) for the slopes’ instability were obtained by varying the regional seismicity and water content conditions. It is recommended that numerical slope stability modeling (i.e., finite element method) be conducted to improve the accuracy of the models.


Keywords


Gunung Batu, Graha Puspa, pseudostatic analysis, percent water fill horizontal seismic coefficient,

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References


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DOI: http://dx.doi.org/10.55981/risetgeotam.2025.1390

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