Cahyani, Annisa Dwi (2025) Analisis Stabilitas Abutment Sisi Sungai Pagar Dengan Cara Analitis Dan Numerik Pada Jembatan Rantau Kasih. Other thesis, Universitas Islam Riau.

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Abstract

he abutment is a substructure located at both ends of a bridge and functions to support the entire load from the superstructure, then distribute it to the ground through the foundation. The objective of this study is to determine the axial and lateral bearing capacity of the pile foundation using analytical methods, the safety factor (SF) for axial and lateral bearing capacity based on analytical methods, the group pile bearing capacity, the axial and lateral bearing capacity using MEH 2D, the settlement and deflection of the pile foundation using MEH 2D, and the safety factor of the slope using MEH 2D. This study uses SPT data, CPT data, the bridge's As-Built Drawing, and the load of Abutment 1, and applies two methods: analytical and numerical. The analytical method includes the Luciano Decourt method for calculating the axial bearing capacity of piles based on SPT data, the Aoki & De Alencar method for axial capacity based on CPT data, the Broms method for lateral bearing capacity, and the Converse-Labarre Formula for calculating the group pile capacity. The safety factor (SF) is calculated based on the respective data. The numerical method uses MEH 2D through the Plaxis 2D V20 software to analyze the axial and lateral bearing capacity of single piles, pile settlement and deflection, and slope stability. The results show that the axial bearing capacity of a single pile using the Luciano Decourt method is 7818,53 kN and using the Aoki & De Alancer method is 4501,74 kN. The lateral bearing capacity of the pile reaches 3195,37 kN. The xx axial safety factor varies for each pile due to differences in applied loads and is considered safe because the safety factor value > 2,5 (minimum safety factor). The lateral safety factor is 6.73 > 1.5 (minimum safety factor). For pile groups, the axial bearing capacity based on SPT data is 94639,18 kN and based on CPT data is 54,488.40 kN. Numerical analysis using Plaxis 2D shows that the variation in axial bearing capacity of each pile differs according to the applied loads and the obtained bearing capacity is greater than the axial load on each pile. The lateral bearing capacity is 2487,48 kN > 474,71 kN (applied lateral load), pile settlement is 0,4887 mm < 156,7 mm (allowable settlement) and pile deflection is 6,48 mm < 200 m (allowable deflection),. The slope safety factor is 5,240 > 1,5 (minimum safety factor). Overall, the analysis results from both analytical and numerical methods indicate that Abutment 1 is in a safe and stable condition, with all pile foundation structure parameters meeting the required safety standards, thus capable of optimally supporting the bridge abutment structure.

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