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Oktarian Wisnu Lusantono
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Analisis Flyrock Untuk Mengurangi Radius Aman Unit Alat Pada Peledakan Overburden PT Putra Perkasa Abadi Site PT Borneo Indobara Kalimantan Selatan Hanung Anggoro; Oktarian Wisnu Lusantono; Gunawan Nusanto; Mardiah Mardiah; Untung Sukamto
Jurnal Teknologi Pertambangan Vol 9, No 1 (2023): Juli 2023
Publisher : UPN Veteran Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jtp.v9i1.10525

Abstract

PT Putra Perkasa Abadi merupakan salah satu perusahaan yang bergerak di bidang jasa kontraktor pertambanganbatubara. Salah satu site operasi yang sedang dikerjakan perusahaan ini ialah site PT Borneo Indobara. Standar radiusaman kegiatan peledakan yang selama ini diterapkan pada PT Putra Perkasa Abadi adalah 300 m untuk alat dan 500m untuk manusia. Standar radius aman ini ditetapkan sesuai Keputusan Menteri ESDM No. 1827 Tahun 2018 TentangPedoman Pelaksanaan Kaidah Teknik Pertambangan Yang Baik. PT Putra Perkasa Abadi akan melakukan reduksijarak aman alat dari 300 m menjadi 150 m. Akan tetapi, jarak maksimum flyrock yang diukur di lapangan memilikijarak 176 m atau masih >150 m. Oleh karena itu jika pada kondisi saat ini akan dilakukan penurunan radius aman alat,maka diperlukan analisis terhadap flyrock sehingga dapat mengontrol flyrock dengan benar dan dapat mengurangiradius aman alat. Penelitian dilakukan dengan mengukur jarak lemparan maksimum flyrock secara aktual di lapangandan menghitung lemparan maksimum flyrock secara teoritis. Analisis jarak flyrock dengan melakukan perhitunganjarak lemparan flyrock maksimum menggunakan Teori Richard dan Moore (cratering), Teori Ebrahim Ghaseminonlinier dan linier. Penentuan keakuratan metode prediksi flyrock ditunjukan dengan perbandingan Root SquareError (RMSE) dan Mean Absolute Error (MAPE). Didapatkan bahwa Teori Richard & Moore memiliki keakuratanpaling tinggi dengan hasil berturut-turut RMSE = 9,82 m dan MAPE = 14,3% dan dipakai untuk prediksi jaraklemparan flyrock pada percobaan peledakan. Kajian untuk pengurangan radius aman alat dari 300 m menjadi 150 m,dilakukan trial dengan menetapkan faktor koreksi 1,02 dan safety factor 1,67 dengan jarak flyrock prediksi maksimalyaitu 90 m. Maka didapatkan tinggi stemming minimum yaitu 2,3 m. Didapatkan serta jarak lemparan flyrockmaksimum aktual tidak ada yang lebih dari 150 m, maka disimpulkan bahwa radius aman alat pada peledakan PTPutra Perkasa Abadi dapat dikurangi dari 300 m menjadi 150 m.
PENILAIAN PERBANDINGAN KESTABILAN LERENG BATUAN MENGGUNAKAN GENERALIZED ANISOTROPIC DAN JOINT NETWORK Akbar, Wahyu Nusantara; Barlian Dwinagara; Singgih Saptono; Dahono Haryanto; Shofa Rijalul Haq; Bagus Wiyono; Oktarian Wisnu Lusantono
Indonesian Mining Journal Vol 28 No 1 (2025): Indoneisan Mining Journal, April 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No1.2025.1548

Abstract

Rock slope stability analysis in a geotechnical study is an important issue in mining engineering. Kinematic analysis is a well-known method to determine potential failures of the rock slope based on structural orientations, but it sometimes disregards the structural properties information. Structural properties are often known as the highly interpreted domains in rock slope engineering; thus, simplification was made for the analysis. Simplification may lead to vague conditions of analysis and reduce its accuracy. Therefore, the aims of this research is to assess the effect of rock structure properties such as heterogeneity, discontinuity, and anisotropic properties of the rock mass. The assessment conducted using the limit-equilibrium method employed the Generalized Anisotropic (GA) material model were compared with finite element method (FEM) using the shear strength reduction (SSR) method employing the joint network rock mass model. The analysis results show that an actual rock slope with a generalized anisotropic material model in the LEM analysis and joint network material model in the FEM analysis is stable with Safety Factor > 1, and the maximum strain model is less than the minimum strain threshold (maximum strain < 0.1). Combining rock slope stability analysis methods aims to produce accurate and representative results regarding the rock mass' condition. This research improves the interpretation of rock slope stability analyses, resulting in a more accurate estimation of the factor of safety (FOS).
PENILAIAN PERBANDINGAN KESTABILAN LERENG BATUAN MENGGUNAKAN GENERALIZED ANISOTROPIC DAN JOINT NETWORK Akbar, Wahyu Nusantara; Barlian Dwinagara; Singgih Saptono; Dahono Haryanto; Shofa Rijalul Haq; Bagus Wiyono; Oktarian Wisnu Lusantono
Indonesian Mining Journal Vol 28 No 1 (2025): Indoneisan Mining Journal, April 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No1.2025.1548

Abstract

Rock slope stability analysis in a geotechnical study is an important issue in mining engineering. Kinematic analysis is a well-known method to determine potential failures of the rock slope based on structural orientations, but it sometimes disregards the structural properties information. Structural properties are often known as the highly interpreted domains in rock slope engineering; thus, simplification was made for the analysis. Simplification may lead to vague conditions of analysis and reduce its accuracy. Therefore, the aims of this research is to assess the effect of rock structure properties such as heterogeneity, discontinuity, and anisotropic properties of the rock mass. The assessment conducted using the limit-equilibrium method employed the Generalized Anisotropic (GA) material model were compared with finite element method (FEM) using the shear strength reduction (SSR) method employing the joint network rock mass model. The analysis results show that an actual rock slope with a generalized anisotropic material model in the LEM analysis and joint network material model in the FEM analysis is stable with Safety Factor > 1, and the maximum strain model is less than the minimum strain threshold (maximum strain < 0.1). Combining rock slope stability analysis methods aims to produce accurate and representative results regarding the rock mass' condition. This research improves the interpretation of rock slope stability analyses, resulting in a more accurate estimation of the factor of safety (FOS).
Co-Authors Akbar, Wahyu Nusantara Bagus Wiyono Barlian Dwinagara Dahono Haryanto Gunawan Nusanto Hanung Anggoro Mardiah Mardiah Shofa Rijalul Haq Singgih Saptono, Singgih Untung Sukamto