Moch Bayu Aji Ainur Rofiq, Laily Endah Fatmawati

ANALISIS DAN PERENCANAAN PERGANTIAN SHEET PILE PADA JALAN GONDANG-LENGKONG KEC.GONDANG KAB. NGANJUK

Introduction

Analisis dan perencanaan pergantian sheet pile pada jalan gondang-lengkong kec.gondang kab. Nganjuk. Analisis & perencanaan penggantian sheet pile jalan Gondang-Lengkong, Nganjuk yang rusak akibat longsor. Menggunakan metode Mononobe-Okabe untuk dimensi optimal W600-B.

Abstract

Pada bahu jalan Gondang-Lengkong, Kecamatan Gondang, Kabupaten Nganjuk terdapat lereng yang diperkuat penahan tanah sheet pile dengan tipe W325. Namun pada lokasi tersebut mengalami kelongsoran yang mengakibatkan sheet pile mengalami kerusakan. Penelitian ini bertujuan menganalisis lereng untuk mendapatkan dimensi sheet pile yang sesuai dengan kondisi lokasi .Penelitian ini menggunakan metode kualitatif dengan teori mononobe-okabe untuk menghitung koefisien tekanan tanah aktif dan pasif dalam kondisi normal dan kondisi gempa. Setelah dilakukan analisis dan pehitungan kombinasi tekanan tanah dalam kondisi normal dan gempa didapat nilai momen ⅀Mmax=569,31 KN.m untuk kondisi normal dan nilai momen ⅀352,68 KN.m dalam kondisi gempa. Sehingga kesimpulan yang didapat diambil nilai momen yang paling besar sebagai faktor keamanan dalam katalog waskita tipe sheet pile yang paling mendekati adalah W600-B dengan crack momen ijin sebesar 584,47 KN.m.

Review

The paper addresses a highly practical and critical issue concerning slope stability and infrastructure integrity along the Gondang-Lengkong road in Nganjuk Regency. The identified problem of a damaged W325 sheet pile due to a landslide underscores the immediate need for a robust engineering solution. The study's objective, to analyze the existing slope and determine appropriate dimensions for a replacement sheet pile, is well-defined and directly contributes to enhancing public safety and infrastructure resilience in the area. This research is therefore timely and relevant for local authorities responsible for road maintenance and geotechnical risk management. The methodology adopted by the study centers on an analytical approach, specifically employing the Mononobe-Okabe theory for calculating active and passive earth pressure coefficients. This method is appropriately applied to evaluate conditions under both normal and seismic loading, which is crucial for designs in earthquake-prone regions. The analysis yielded a maximum design moment of 569.31 KN.m for normal conditions and 352.68 KN.m for seismic conditions. Commendably, the study prioritizes the larger moment for safety, leading to the recommendation of a W600-B sheet pile from the Waskita catalog, which possesses an allowable crack moment of 584.47 KN.m, demonstrating a clear and logical design selection process. While the study provides a valuable, actionable solution, there are areas where further detail could strengthen its contribution. The abstract's mention of a "kualitatif method" appears to be a mischaracterization given the quantitative nature of the Mononobe-Okabe calculations; clarifying the methodological distinction between problem identification and engineering analysis would improve precision. More importantly, the abstract lacks specific details regarding the soil parameters (e.g., unit weight, friction angle, cohesion) and seismic coefficients used in the Mononobe-Okabe theory, which are fundamental to the robustness of the calculations. Additionally, a brief discussion on the likely causes of the initial sheet pile failure, beyond simply "kelongsoran" (landslide), would offer deeper context and prevent recurrence. Future research could benefit from a more comprehensive geotechnical characterization, sensitivity analyses of the design parameters, and consideration of long-term performance monitoring for the proposed replacement structure.

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