ANALISIS KESTABILAN LERENG PADA TAMBANG BATU ANDESIT CV. EMPAT LIMA DESA MORANG KECAMATAN KARE KABUPATEN MADIUN PROVINSI JAWA TIMUR

Muhammad Roisul Amin, Yudho Dwi Galih Cahyono

Abstract

ABSTRACT

The research location is located at IUP Madiun CV. Four Five Morang Villages, Kare District, Madiun Regency, East Java Province. At the research location, mining has been carried out using the open pit mining method, so it cannot be separated from problems related to geotechnical slope stability. The aim of the research is to determine the value of the safety factor using the Janbu simplified and Janbu corrected methods. Slope calculations are carried out in dry, semi-saturated and saturated conditions. The safety factor calculation was applied in Rockscience Slide v 6.0 software. The analysis results show that the value of the condition of the existing slope is in the safe category in dry, semi-saturated and saturated conditions with a safety factor value in dry conditions with a slope height of 10 meters, a slope angle of 85° and a bench width of 3 meters which has a safety factor value of more than 1.0, which is equal to 1,222 with the Janbu Simplified method, and a slope height of 10 meters, slope angle of 85° and bench width of 3 meters which has a safety factor value of more than 1.0, namely 1,281 with the Janbu corrected method. The value of the safety factor in a half-saturated state with a slope height of 10 meters, a slope angle of 85° and a bench width of 3 meters which has a safety factor value of more than 1.0 is 1.121 using the Janbu Simplifed method, and a slope height of 10 meters, a slope angle of 85° and a bench width 3 meters which has a safety factor value of more than 1.0, namely 1,178 using the Janbu corrected method. The saturated safety factor value with a slope height of 8 meters, a slope angle of 80° and a bench width of 3 meters which has a safety factor value of less than 1.0 is 0.984 with the Janbu Simplifed method, and a slope height of 8 meters, a slope angle of 80° and a bench width of 3 meters which has a safety factor value of more than 1.0, namely 1.038 with the Janbu corrected method.

Keywords: Slope stability, andesite stone, janbu method, safety factors.

 

ABSTRAK

Lokasi penelitian terletak pada IUP Madiun CV. Empat Lima Desa Morang Kecamatan Kare Kabupaten Madiun Provinsi Jawa Timur. Pada lokasi penelitian telah dilakukan penambangan dengan menggunakan metode penambangan tambang terbuka, dengan begitu tidak lepas dari permasalahan terkait geoteknik kestabilan lereng. Tujuan penelitian untuk mengetahui nilai faktor keamanan menggunakan metode janbu simplifid dan janbu corrected. Perhitungan lereng dilakukan dalam keadaan kering, setengah jenuh dan jenuh. Perhitungan faktor keamanan diaplikasikan dalam software rockscience slide v 6.0. Hasil analisis diperoleh nilai kondisi lereng eksisting dalam kategori aman pada kondisi kering, setengah jenuh dan jenuh dengan nilai faktor keamanan dalam keadaan kering dengan tinggi lereng 10 meter, sudut lereng 85° dan lebar bench 3 meter yang memiliki nilai faktor keamanan lebih dari 1.0 yaitu sebesar 1.222 dengan metode Janbu Simplifed, dan tinggi lereng 10 meter, sudut lereng 85° dan lebar bench 3 meter yang memiliki nilai faktor keamanan lebih dari 1.0 yaitu sebesar 1.281 dengan metode Janbu corrected. Nilai faktor keamanan keadaan setengah jenuh dengan tinggi lereng 10 meter, sudut lereng 85° dan lebar bench 3 meter yang memiliki nilai faktor keamanan lebih dari 1.0 yaitu sebesar 1.121 dengan metode Janbu Simplifed, dan tinggi lereng 10 meter, sudut lereng 85° dan lebar bench 3 meter yang memiliki nilai faktor keamanan lebih dari 1.0 yaitu sebesar 1.178 dengan metode Janbu corrected. Nilai faktor keamanan jenuh dengan tinggi lereng 8 meter, sudut lereng 80° dan lebar bench 3 meter yang memiliki nilai faktor keamanan kurang dari 1.0 yaitu sebesar 0.984 dengan metode Janbu Simplifed, dan tinggi lereng 8 meter, sudut lereng 80° dan lebar bench 3 meter yang memiliki nilai faktor keamanan lebih dari 1.0 yaitu sebesar 1.038 dengan metode Janbu corrected.

Kata kunci: Kestabilan lereng, batu andesit, metode janbu, faktor keamanan.

 

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