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Characteristics of Geological Conditions on Safety Factor (FK) of Open-Pit Slope and Landslide Mitigation at the Green Pit Location of Nickel Mining at PT. IFISHDECO Tb Hasibuan, Parlindungan; Chaerul, Muhammad; Gusty, Sri
Ranah Research : Journal of Multidisciplinary Research and Development Vol. 7 No. 3 (2025): Ranah Research : Journal Of Multidisciplinary Research and Development
Publisher : Dinasti Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38035/rrj.v7i3.1422

Abstract

The research location is within the IUP area of PT. IFISHDECO Tbk (122.168°–122.204° E and 4.371°–4.404° S), Tinanggea, South Konawe Regency, Southeast Sulawesi Province. This study aims to analyze the Safety Factor (SF) values of the slopes and the probability of landslide potential at the green pit mining slopes, as well as the landslide hazard mitigation map. The data used include engineering geological characteristics, topographic measurements obtained via total station, aerial photographs (drone), and rock mechanics sample test results. The SF analysis applied is the Simplified Bishop method with Mohr-Coulomb analysis, processed using Slide ver.6 software, along with landslide hazard potential maps and landslide hazard mitigation maps based on the Ministry of Energy and Mineral Resources of the Republic of Indonesia Decree (KEPMEN ESDM RI) No. 1827 K/30/MEM/2018.The research results are derived from slope stability analysis at the green pit mining site based on the static Safety Factor (SF) according to the rules of KEPMEN ESDM RI No. 1827 K/30/MEM/2018, which are as follows: - Single Slope Type: SF 0.91 - 1.26 (Unstable – Balanced) - Inter-ramp Slope Type: SF 1.15 - 1.25 (Balanced) - Overall Slope Type: SF 1.31 – 1.37 (Stable). The probability of soil movement (landslide) potential is 10 – 25%, with a medium severity landslide category. The medium severity landslide category applies when there are consequences such as serious human injuries, damage to facilities and infrastructure from 25% to 50%, production stoppages of more than 12 hours but less than 24 hours, buried reserves that can still be recovered, and environmental damage within the scope of the IUP area.The landslide hazard potential map is divided into three severity categories: low landslide severity, medium landslide severity, and high landslide severity. The landslide hazard mitigation map for the green pit open-pit mining site provides information on potential hazard zones covering an area of 0.33 hectares at the pit slope, safe zones covering 2 hectares outside mining activities, evacuation routes with distances ranging from 68 m to 267 m to the safe zone, and worker assembly points (muster points) equipped with emergency response facilities such as first-aid supplies, transportation means, mobilization facilities, and communication equipment, all of which are part of the mining safety management system.
Model Terowongan Pipa Sudetan Ciliwung-Cipinang dalam Mitigasi Banjir Kali Ciliwung dengan Metode HEC-RAS ver.6.3 Makkaraka, Muhammad Lottong; Chaerul, Muhammad; Hasibuan, Parlindungan; Nurdyansyah, Haris; Pasorong, Erich Purnama
Ranah Research : Journal of Multidisciplinary Research and Development Vol. 7 No. 6 (2025): Ranah Research : Journal Of Multidisciplinary Research and Development
Publisher : Dinasti Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38035/rrj.v7i6.1749

Abstract

Penelitian ini bertujuan untuk menganalisis model terowongan pipa sudetan ciliwung cipinang dalam melakukan mitigasi kali ciliwung. Dalam memodelkan terowongan peneliti menggunakan aplikasi HEC-RAS 6.3 untuk membuat aligment terowongan yang meliputi penampang terowongan (cross section) dan (long section) serta memasukan debit banjir Q2th, Q5th, Q10th, Q25th, Q50th, dan Q100th. Penelitian ini menggunakan mix methode yaitu deskriptif kuantitatif, dengan memodelkan penampang terowongan serta memperhitungkan kondisi aliran bebas dan tertekan. Adapun dari hasil pemodelan penampang long section terowongan sudetan didapatkan nilai WS Q5 berada pada elevasi 7m, Q10 elevasi 12m, Q25 elevasi 13m, Q50 elevasi 15m, dan Q100 elevasi 16m. Adapun pada elevasi 9.67 m kondisi aliran bebas masih kategori stabil, elevasi rata-rata berada pada elevasi 11m Dimana kondisi aliran bebas ini masuk dalam kategori superkritis. Kesimpulan yang di peroleh dari keseluruhan Analisa data yaitu pada penampang long section terowongan didapatkan nilai tinggi muka air pada elevasi terendah yaitu pada Q5=7m dan nilai tinggi muka air pada elevasi tertinggi yaitu Q100=16m. Sehingga didapatkan bahwa terowongan pipa sudetan termasuk cara alternatif untuk melakukan mitigasi banjir khususnya pada lokasi kali ciliwung