Huda, Syaiful (2025) Analisa Perilaku Deformasi Lateral Dinding Penahan Tanah Di Sungai Beduk Kota Batam Dengan Metode Elemen Hingga. Other thesis, Universitas Islam Riau.

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Abstract

Sungai Beduk is one of the main rivers that functions to control floods in Batam City. The development and widening of Sungai Beduk are carried out gradually towards the estuary along a 1.5 km stretch. During the construction in 2019, the river was widened from its original width of 6 meters to 30 meters, with the reinforcement of the river slope in the form of a retaining wall (DPT) with a height of 2.45 meters. During the construction, there was a displacement of the retaining wall due to soil deposition behind it. After 2 years, there were road subsidence and cracks on the concrete pavement of the inspection road. This study is conducted to analyze the instability that occurs in the retaining wall due to the loads and forces acting on it, by performing manual calculations and finite element method to determine the safety factor and the causes of the retaining wall displacement. The analysis is conducted based on two soil investigation data points, namely BH. 01 and BH. 03. Manual calculations and finite element method simulations are performed for possible field conditions such as dry water surface condition, normal water surface condition, flood water surface condition, and rapid drawdown condition. The manual calculations are reviewed for the stability of the retaining wall in resisting overturning forces, shear forces, and soil bearing capacity. In the finite element method simulation using Plaxis 2D, the parameters of the concrete foundation structure, concrete column of the retaining wall, and wooden piles are idealized due to the presence of soil between them. Based on manual calculations, the retaining wall is safe against overturning, sliding, and soil bearing capacity in dry and normal water conditions. However, in flood water level calculations and rapid drawdown conditions, the soil bearing capacity is not safe to withstand DPT. In the simulation results using the finite element method, a deformation safety factor of 2.124 > 1.5 (safe) is obtained at BH. 01 and a safety factor of 8.976 > 1.5 (safe) is obtained at BH. 03 under flood conditions. Significant deformation occurs in the inspection road concrete, amounting to 287 mm, and consolidation shows a decrease of 141.82 mm with a safety factor of 2.142 under flood water level conditions at BH. 01. In the simulation for each condition, deformation and settlement behavior are observed in the concrete inspection road. The stability of the retaining wall is good and safe under various conditions, but it deforms towards the river due to excessive lateral soil pressure caused by the uniform load on the inspection road and the effective stress affecting the shear strength and volume change of the soil. Keywords: Retaining Wall, Water Surface, Finite Element Method, Deformation, Safety Factor.

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