Slope Stability Analysis Using Electrical Resistivity Tomography and Limit Equilibrium Method: A Case Study from Girimulyo, Kulon Progo
Penulis/Author
Putri Anjary Widya Santie (1); Prof. Dr.Eng. Ir. Wahyu Wilopo S.T., M.Eng., IPM. (2); Dr.Eng. Fikri Faris, S.T., M.Eng. (3)
Tanggal/Date
31 2024
Kata Kunci/Keyword
Abstrak/Abstract
Girimulyo sub-district is one of the areas with high landslide risk in KulonProgo Regency. On March 12, 2018, a landslide occurred in the area. Seven families wereaffected, and landslide material blocked the road. This study uses the limit equilibriummethod to determine slope conditions through electrical resistivity tomography (ERT) andslope stability analysis. Based on the interpretation of the ERT profile, it is known that alayer with a resistivity value of <5Ωm is wet clay; 5–15Ωm is wet silt; 15-150Ωm issilt-to-sand; and >150Ωm is bedrock. The sliding surface is thought to be at the bound-ary between the damp clay and wet silt layers. The interpretation of the ERT profile isconfirmed by data from laboratory tests on soil samples. Slope stability analysis was per-formed using ERT profile interpretation and soil sample laboratory test data. The slopestability analysis results show that both the slopes that experienced landslides in 2018 andthose that did not experience landslides were stable when the water table was 3 metersdeep. However, the landslide slopes are in critical condition as the groundwater levelrises, while the non-landslide slopes remain stable.
