Hafizh, Muhammad (2024) Analisa Stabilitas Dinding Penahan Tanah Jenis Tiang Pancang Menggunkan Finate Elemen Method (fem) Pada Proyek Revitalisasi Danau Di Rokan Hulu, Riau. Other thesis, Universitas Islam Riau.

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Abstract

Rapid population growth in Indonesia has driven an increase in the need for infrastructure development, including retaining walls to maintain slope stability in various projects. One important project is the revitalization of Lake Rokan Hulu, Riau, which aims to change the function of the lake from a fishing spot to a tourist destination as well as an effort to mitigate annual flooding. This study focuses on the stability analysis of pile-type retaining walls using the finite element method with Plaxis 2D software. This study evaluates the safety factor of unreinforced slopes, with mini pile reinforcement, and compares the effectiveness of mini piles with cantilever retaining walls. Geotechnical data collection was conducted through Cone Penetration Test (CPT) field tests, the results of which were used to determine soil parameters such as cohesion, internal friction angle, and modulus of elasticity. Plaxis 2D modeling was performed based on slope geometry and relevant soil conditions. The analysis results showed that unreinforced slopes had a low Safety Factor value, increasing the risk of landslides. With the addition of mini pile reinforcement, the Safety Factor value increased significantly to reach the safety threshold. Compared to cantilever retaining walls, mini piles are superior in increasing slope stability and offer material efficiency and ease of construction implementation. This study provides significant contributions to the development of slope stability analysis methods in Indonesia, especially in areas with complex land contours. The slope modeled on the lake was excavated to increase its capacity so that a safety factor value of 1.189 was obtained. The safety factor value of the slope after being reinforced with mini piles was 2.535. The safety factor value of the slope after being reinforced with cantilever was 1.327. From these results, it can be concluded that the slope in the lake area must be reinforced with mini piles and is not suitable for cantilever type DPT to maintain the stability of the slope. This is because the safety factor value obtained is 1.189 which means that the slope is in a critical condition and is very susceptible to landslides and the SF value obtained from the cantilever reinforcement is 1.327 meaning that the slope is safe but has the potential to landslide if external conditions such as high rainfall and earthquakes occur.

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