Arfilian Permana Putra, Debby Syafriyandi

Analisis Stabilitas Lereng dengan Metode Finite Element Method untuk Pembangunan Jembatan Wai Apu

Introduction

Analisis stabilitas lereng dengan metode finite element method untuk pembangunan jembatan wai apu. Analisis stabilitas lereng jembatan Wai Apu menggunakan Finite Element Method (FEM) dengan Plaxis 2D. Meninjau kondisi lereng asli, berbeban, dan pengaruh muka air tanah untuk faktor keamanan.

Abstract

Pada kondisi dimana pembangunan jembatan yang menghubungkan dua daerah yang terpisah oleh aliran sungai pasti perlu untuk menganalisis dari stabilitas lereng dimana nantinya akan dipergunakan sebagai konstruksi abutment dari konstruksi jembatan. Oleh karena itu dalam penelitian ini akan meninjau dari stabilitas lereng yang akan digunakan sebagai konstruksi pembangunan jembatan dengan menggunakan Finite Element Method (FEM) dengan aplikasi Plaxis 2D dimana hasil analisisnya berupa bentuk longsoran lereng beserta nilai Faktor Keamanan (FK). Peninjauan perhitungan stabilitas lereng akan dimodelkan menjadi dua yaitu ketika lereng kondisi asli dan ketika lereng diberi beban, dengan setiap pemodelan akan ditinjau ketika Muka Air Tanah (MAT) normal dan ketika MAT naik (curah hujan tinggi). Kemudian dengan meninjau permasalahan tersebut didapat nilai analisis dengan FEM pada lereng kiri (arah Mako) ketika lereng tanpa beban dengan MAT normal nilai FK 1,797, dan ketika curah hujan tinggi nilai FK 1,760, pada kondisi lereng dengan beban dengan MAT normal nilai FK 1,714, dan ketika curah hujan tinggi nilai FK 1,680 . Kemudian analisis lereng kanan (arah Modanmohe) nilai dari analisis lereng tanpa beban dengan MAT normal nilai FK 1,686, dan ketika curah hujan tinggi nilai FK 1,655, pada kondisi lereng dengan beban dengan MAT normal nilai FK 1,646, dan ketika curah hujan tinggi nilai FK 1,610.

Review

This study presents a timely and practically relevant analysis of slope stability for the abutment construction of the Wai Apu Bridge, utilizing the Finite Element Method (FEM) through Plaxis 2D software. The abstract clearly articulates the necessity of such an analysis for critical infrastructure projects connecting regions separated by a river. The methodology appears sound, involving a comparative assessment of slope stability under both original and loaded conditions, critically considering variations in groundwater levels (normal vs. high rainfall). This comprehensive approach in modeling different scenarios enhances the practical applicability of the findings, providing valuable insights for the safe design and construction of the bridge foundations. A significant strength of the research lies in its systematic approach to evaluating slope stability under varied environmental and loading conditions. The use of Plaxis 2D is appropriate for this type of geotechnical analysis, allowing for the determination of both the landslide shape and, crucially, the Factor of Safety (FK). The detailed presentation of FK values for both the left (Mako) and right (Modanmohe) slopes, across all four modeled scenarios (unloaded/loaded, normal GWT/high rainfall), demonstrates a thorough investigation. It is notable that all reported FK values are above 1.0, suggesting a degree of stability, and the logical trend of decreasing FK with increased load and higher groundwater levels validates the model's physical representation of the slope behavior. While the abstract provides a strong overview of the study's scope and key numerical findings, several aspects would benefit from further elaboration in the full paper. To enhance the robustness and replicability of the findings, it would be crucial to detail the soil parameters used in the FEM analysis (e.g., cohesion, friction angle, unit weight, stiffness) and how these parameters were derived (e.g., field investigations, laboratory tests, literature review). Furthermore, the abstract mentions "bentuk longsoran lereng" (slope landslide shape); a discussion on the implications of these failure mechanisms for design and potential mitigation strategies would be valuable. Finally, stating the minimum acceptable Factor of Safety for this specific project or region would provide essential context for interpreting the calculated FK values and their adequacy for safe bridge construction.

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