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All Journal Interdisciplinary Social Studies
Noor Endah Mochtar
Institut Teknologi Sepuluh Nopember
Environmental Science Languange, Linguistic, Communication & Media Public Health Social Sciences

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The Effect of Cracked Soil on Slope Stability on the Karo Regency Boundary Road – Panji Sta 26+000, North Sumatra Province Edward Piter Siagian; Indrasurya B. Mochtar; Noor Endah Mochtar; Sriayu Saputri Situmeang
Interdisciplinary Social Studies Vol. 5 No. 1 (2025): Regular Issue: October-December 2025
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/iss.v5i1.976

Abstract

The landslide incident on the Karo Regency Boundary Road – Panji STA 26+000, North Sumatra Province, showed a decrease in slope stability as indicated by a safety factor (sf) value of less than 1.00. This study aims to analyze the causes of slope instability influenced by the cracked soil phenomenon and heavy rain. The slope stability analysis research method was carried out using Geo5 software based on the limit equilibrium method. The simulation results with the Geo5 application on the original soil conditions showed a safety factor (sf) value of 2.10 which indicated that the slope was in a safe and stable condition. However, after the cracked soil parameters and heavy rain intensity were entered into the Geo5 application, the analysis results showed a drastic decrease in the safety factor (sf) value to 0.93 which indicated that the slope was in an unsafe condition or a landslide. The cracked soil phenomenon increased the infiltration path of rainwater which then accelerated the increase in pore water pressure and weakened the shear strength of the soil, causing landslides.
Analysis of Foam Mortar and Prefabricated Vertical Drain (PVD) Application for Soft Soil Improvement on the Aruk–Sp. Take Road Section, Sambas Regency, West Kalimantan Victor Bela Sendoro Hia; Indrasurya B. Mochtar; Noor Endah Mochtar
Interdisciplinary Social Studies Vol. 5 No. 1 (2025): Regular Issue: October-December 2025
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/iss.v5i1.981

Abstract

Infrastructure damage on the Aruk – Sp. Take Road Section, Sambas Regency (especially STA 99+000 to STA 99+550), is directly attributed to soft soil conditions characterized by low bearing capacity and high compressibility. Previous conventional repair methods were deemed ineffective, while permanent solutions involving Pile Slabs proved to be financially prohibitive for extensive road segments. This study aims to analyze the effectiveness of combining a lightweight fill material (Foam Mortar) with consolidation acceleration using Prefabricated Vertical Drains (PVD) on key geotechnical parameters: settlement, consolidation time, and slope stability. The methodology comprises soil data analysis, modeling of embankment designs with varying Foam Mortar compositions (0%, 25%, and 50%) at different heights, and consolidation calculations using a triangular PVD pattern. The analysis results demonstrate that installing PVD at an optimal spacing of 1.25 meters achieved a degree of consolidation of 91.2% within 22 weeks. Furthermore, the inclusion of Foam Mortar was proven significant in reducing the overall load and substantially improving stability. In the final height design of 3.30 meters, the 50% Foam Mortar variation reduced the maximum settlement to 1.38 meters (compared to 1.70 meters on 100% conventional earthfill) and drastically increased the Safety Factor (SF) from 1.90 to 3.06.
Co-Authors Edward Piter Siagian Indrasurya B. Mochtar Sriayu Saputri Situmeang Victor Bela Sendoro Hia