Analisis Balik Longsoran Low Wall Pit B3 Di Tambang Batubara Pt Bja Menggunakan Metode Probabilistik Monte Carlo

Ginan Ginanjar Kosim, Maryanto Maryanto, Dono Guntoro

Abstract


Penelitian Back Analysis pada longsoran busur di Low wall Pit B3 tambang batubara PT Beringin Jaya Abadi di Desa Sungai Payang, Dusun Beruak, Kecamatan Loa Kulu, Kabupaten Kutai Kartanegara, Provinsi Kalimantan Timurdilakukan denganmetode Probabilistik Monte Carlo. Data awal untuk analisis balik yang digunakan adalah hasil uji sifat mekanik batuan, klasifikasi massa batuan dengan metode RMR dan GSI.Hasil yang didapat dari pemetaan geoteknik ini adalah nilai RMR (Rock Mass Rating) = 26 (Poor Rock); nilai Geological  Strength Index (GSI)  = 32 (Poor Surface Condition). Data awal nilai parameter kekuatan batuan untuk analisis balik yaitu batuan Mudstone 1 : Kohesimin-max 33.56-258.41 kN/m2dan sudut geser dalammin-max 1.650-14.210 ; Mudstone 2 : Kohesimin-max 42.24-352.73 kN/m2 dan sudut geser dalammin-max 2.950-24.120 ; Mudstone 3 : Kohesimin-max 40.83-268.02 kN/m2 dan sudut geser dalammin-max 2.050-16.590. Hasil yang didapatkan dari analisis balik untuk batuan Mudstone 1 : kohesi 144 kPa dan sudut geser dalam 8.040; Mudstone 2 : kohesi 134.2 kPa dan sudut geser dalam 17.850; Mudstone 3 : kohesi 124.9 kPa dan sudut geser dalam 11.210. Berdasarkan hasil simulasi untuk lereng Low Wall diperoleh geometri yang direkomendasikan yaitu Overall Slope Angle (OSA) 200-250, tinggi lereng keseluruhan ± 47 meter disertakan dengan penanggulangan untuk air berupa paritan dan saluran keliling.

Keywords


RMR, GSI, Probabilistik Monte Carlo,&Analisis Balik.

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