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All Journal U Karst Indonesian Geotechnical Journal
Pramono Rahardjo, Paulus
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences

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Spatial Variability of Sliding Plane on Volcanic Region. Case Study of Sta 21+200 Cisumdawu Toll Road Arsyad, Ahmad Kemal; Wijaya, Martin; Johan, Albert; Pramono Rahardjo, Paulus
Indonesian Geotechnical Journal Vol. 3 No. 2 (2024): Vol. 3, No. 2, August 2024
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v3i2.69

Abstract

Landslide can be caused either by natural phenomenon or due to human intervention. Regardless of the triggering factor, once landslide occurs, sliding plane in the form of discontinuity or sometimes referred as sliding plane is formed. Identifying the location and geometry of the sliding plane is important in determining the location of the reinforcement to rehabilitate slope failure. However, it is often difficult to locate the location and geometry of the sliding plane as the sliding direction is also difficult to ascertain. In this paper, slope failure which occurred in STA 21+200 of Cisumdawu toll road is used as case study. Variability of the sliding planes are investigated based on the location of the concrete overbreak that occurred during the bored pile construction on Tuff (volcanic soils) in Sumedang Region. Sliding planes are also estimated based on the soil investigation and pile boring records. The proposed solution is to reinforce the bored piles that did not penetrate into the hard layer with ground anchors installed at the pile cap.
Landslide Mechanisms in the Cisumdawu Toll Road through a Geoforensics Approach to Increase Slope Stability Mardjuni, Adhystira; Pramono Rahardjo, Paulus; Aldiamar, Fahmi
UKaRsT Vol. 9 No. 1 (2025): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v8i1.6587

Abstract

Landslides are a significant threat to infrastructure in tropical regions like Indonesia, especially in projects that cross volcanic slopes. A significant case occurred on the Cisumdawu Toll Road Section 2, triggered by high rainfall and water-saturated young volcanic soil. Given the complexity of such failures, comprehensive investigations are crucial. This study aims to analyze the causes and mechanisms of landslides in the Ciherang Village, specifically at STA 19 KM 65 using a geoforensics approach. This approach involves field investigations to collect geotechnical and geophysical data such as boring logs, SPT, pressure meters, inclinometers, and geoelectric resistivity testing. These were used to reconstruct subsurface conditions before failure. Numerical modeling was then performed with variations in groundwater level (GWL) and K₀ to simulate slope stability and identify failure triggers. The results show that landslides was translational, occurring in the transition zone between sandy silt (tuff) and weathered tuff breccia layers at depths of 30–35 meters, where differences in permeability made the zone vulnerable. The decrease in GWL significantly improved slope stability, increasing the safety factor to 1.435, while K₀ variation had a lesser impact. A combination of bored piles, ground anchors, soil nailing, and slope regrading effectively stabilized the slopes. These findings contribute to a better understanding of the mechanisms and causes of landslides so that mitigation strategies can be more targeted to increase slope stability.
Co-Authors Arsyad, Ahmad Kemal Fahmi Aldiamar, Fahmi Johan, Albert Mardjuni, Adhystira Wijaya, Martin