Firmansyah, Ryan (2025) Analisis Stabilitas Perkuatan Tebing Dalam Menahan Beban Hidup Dan Beban Mati: Studi Kasus Proyek Perkuatan Tebing Sungai Pawan Desa Rambah Tengah Hulu. Other thesis, Universitas Islam Riau.

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Abstract

The foundation design for civil structures in Sungai Pawan, Rambah Tengah Hulu Village, Rokan Hulu Regency, faces technical challenges due to subgrade conditions in a steep slope area, causing soil slippage. This issue is further aggravated by rainfall, which raises the river water level and results in erosion of the slope walls. To address these issues, a civil engineering solution was implemented by reinforcing the slope soil using a gravity-type retaining wall. The objective is to calculate the safety factor of the existing slope before and after reinforcement with a gravity wall using the Fellenius method and the Finite Element Method (FEM). The Fellenius method calculates the slope safety factor using the slice approach, where the slope soil is divided into seven vertical slices. The Finite Element Method (FEM) is a numerical technique used to analyze and solve complex civil engineering problems, calculated using the Plaxis software. The data used in this analysis are cone penetration test (CPT) results. The safety factor of the existing slope without reinforcement at CPT point 01, calculated using the Fellenius method, is 2.710, indicating a safe condition (SNI 8460-2017). Meanwhile, at CPT point 02, the safety factor is . For the unreinforced slope, Plaxis analysis at CPT point 01 shows a safety factor of 1.901 with a consolidation of 0.01291 m, which also indicates a relatively safe condition. At CPT point 02, the safety factor is 1.309 with a consolidation of 0.04145 m, which remains in a relatively stable condition. After reinforcement using a gravity wall, the safety factor increased to 2.276 with a consolidation of 0.9626 m, indicating the slope is in a safe condition. Seismic safety factor analysis using a seismic coefficient of 0.3 g shows a safety factor of 1.181, which remains relatively stable despite the potential risk of slippage under changing external conditions, such as heavy rainfall or earthquakes. It can be concluded that the slope in its existing condition is already safe, especially at CPT point 01, which has a high safety factor value. Reinforcement with a gravity wall enhances slope stability with a higher safety factor. However, attention should be given to the potential risk of slippage if external conditions change. This study can serve as a reference for river slope reinforcement using gravity walls to enhance the slope safety factor.

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