Integrated Geoelectric-Geotechnical Characterization  For Landslide Mitigation In East Kalimantan, Indonesia

Aco Wahyudi Efendi

doi:10.47233/rivet.v6i01.2703

Aco Wahyudi Efendi Universitas Sebelas Maret Surakarta

DOI: https://doi.org/10.47233/rivet.v6i01.2703

Keywords: Geotechnical, Geoelectric Resistivity, Landslide Investigation, Standard Penetration Test (SPT), Test Pit Excavation

Abstract

A significant landslide affecting Syarifuddin Yoes Road in the Kutai Basin, East Kalimantan, was triggered by elevated pore water pressure from leaking PDAM water infrastructure and inadequate surface drainage. This investigation integrated two-dimensional (2D) geoelectric resistivity surveys (Schlumberger configuration), Standard Penetration Tests (SPT), and visual inspection from 4-meter-deep test pits to characterize the 60-meter rotational failure mechanism. Visual analysis revealed a continuous soil flow. A robust inverse correlation was established: low-resistivity anomalies (1–50 Ohm-m) directly corresponded with low SPT N-values (2–8 blows/30 cm) and weak saturated clays. Borehole data detected groundwater at 4 meters, aligning with low-resistivity anomalies at 4.5 meters. This multi-method approach successfully identified the primary weak slip surface at a depth of 5 to 8 meters. The geoelectric method is recommended as an efficient, cost-effective initial benchmark for spatial subsurface characterization before costly intrusive boring. These integrated subsurface models substantiated the design of D600 Contiguous Bored Piles as a mitigation structure.

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Integrated Geoelectric-Geotechnical Characterization For Landslide Mitigation In East Kalimantan, Indonesia

Abstract

References

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