Assessment of Slope Stability and Reinforcement for the Trans Liang Melas Datas Road Using HYRCAN

Hendrikus Heriawan Parbunan  Sagala; Muhammad  Qarinur

doi:10.70716/reswara.v4i4.882

Authors

Hendrikus Heriawan Parbunan Sagala Civil Engineering Study Program, Faculty of Engineering, Universitas Negeri Medan, Medan, Indonesia Author
Muhammad Qarinur Civil Engineering Study Program, Faculty of Engineering, Universitas Negeri Medan, Medan, Indonesia Author

DOI:

https://doi.org/10.70716/reswara.v4i4.882

Keywords:

slope stability, analytical method, numerical method, HYRCAN program, slope reinforcement

Abstract

The Trans Liang Melas Datas Road in Karo Regency serves as a strategic route connecting six villages and three hamlets; however, unstable geological conditions pose significant landslide hazards that disrupt accessibility and socio-economic activities. This study aims to analyze slope stability and evaluate the effectiveness of reinforcement methods suitable for site-specific geometry and geological conditions. Soil parameters were obtained through laboratory testing of six landslide samples, while geometric data were collected using topographic surveys with a hypsometer. Slope stability was analyzed using analytical approaches with Bishop, Janbu, Spencer, and GLE/Morgenstern-Price methods, as well as a numerical approach based on the finite element method utilizing HYRCAN 2.0.19 software. The results indicate that all slope locations are unstable with safety factor (SF) values below 1.8, with the lowest SF recorded at 0.250 in Location 1. Comparisons between analytical and numerical approaches revealed average differences of 9 to 10% across all methods, yet consistently indicated slope vulnerability. Reinforcement simulations using terracing and shotcrete successfully improved SF values beyond the safe threshold (SF > 1.8). Terracing proved more effective in reducing slope gradient and enhancing overall stability, while shotcrete is recommended for areas with limited space or where surface protection against erosion and weathering is required.

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