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PENGARUH JUMLAH KOMPOSIT BATUAN TERHADAP KESTABILAN LERENG TAMBANG TERBUKA BATUBARA MULTI LAPISAN MENGGUNAKAN METODE ELEMEN HINGGA 3 DIMENSI
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ABSTRAK
PT. X memiliki disain rencana tambang (pit plan) tahun 2020, yang memerlukan analisis kestabilan lereng guna mengoptimasi cadangan batubara tertambang dan keselamatan operasi penambangan. Pada penelitian ini, analisis kestabilan lereng menggunakan metode elemen hingga (MEH) 3 dimensi. Di samping itu juga dilakukan analisis probabilistik guna memvalidasi hasil perhitungan MEH 3 dimensi. Kompleksitas lapisan batuan yang cukup banyak pada tambang MIP memberikan kesulitan dalam memodelkan dalam analisis 3D menggunakan MEH. Oleh sebab itu digunakan pendekatan pembobotan parameter karakteristik batuan dalam menelaah keakurasian hasil perhitungan faktor keamanan (FK) dan penentuan lokasi lereng kritis. Secara praktis pendekatan pembobotan ini sudah diterapkan di sejumlah tambang batubara di Indonesia, namun terbatas pada analisis 2D. Oleh sebab itu hasil penelitian ini menjadi suatu pencapaian penting yang dapat disosialisasikan dan diaplikasikan oleh para praktisi geoteknik tambang di Indonesia
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