Setiawan, Dodi Dwi (2025) Analisis Kestabilan Dinding Penahan Tebing Sungai Batang Kumu Desa Tanjung Medan Terhadap Faktor Aman. Other thesis, Universitas Islam Riau.

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Abstract

Slope is a land surface that has a slope and forms a certain angle to the horizontal plane and is not protected, usually on the river there are many slopes. One of the problems that most often occurs on river slopes is the occurrence of morphological changes due to soil shifts on river slopes. On the Batang Kumu river, tanjong medan village, rokan hulu district, one of the causes of damage to the river slope is the scouring of the cliff foot which is unable to withstand the scouring of the river current. This scour is caused by the flow of the river. This study aims to determine the value of the safety factor (Safety Factor) of the slope without reinforcement using the bishop method, as well as comparing the effectiveness of bored pile type retaining walls using the finite element method. The method to calculate the safety factor value of the existing slope before and after being reinforced with bored piles uses the Bishop method and the finite element method. Bishop's method calculates the slope safety factor using a wedge approach, the soil on the slope is divided into 7 vertical wedges. Finite element method is a numerical technique used to analyze and solve complex civil engineering problems, which is calculated using the Plaxis application. The data used in this analysis is cone penetration test data. This research contributes significantly to the development of slope stability analysis methods in Indonesia, especially in areas with complex soil contours. The slope modeled on the river obtained a factor of safety value of 1.44 < 1.5. Furthermore, based on the analysis of the existing slope without reinforcement using the finite element method (MEH) with the help of plaxis2D software, a safety factor of 1.278 < 1.5 was obtained. Thus, it can be concluded that the slope is in an unsafe condition. The safety factor value of the slope after reinforcement in the form of bored piles is 1,805 > 1.5. From these results it can be concluded that the slope in the river area must indeed be reinforced to maintain the stability of the slope. The reinforcement chosen by the author is bored pile reinforcement. This is because the safety factor value obtained is 1,805. This indicates that the slope is safe against landslides and indicates that the slope is safe or stable against landslides.

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