CONVERGENCE MONITORING UNTUK PREVENTIVE SUPPORT MAINTENANCE BERDASARKAN NILAI POTENTIAL DISPLACEMENT PADA AREA CONVEYOR DEEP MILL LEVEL ZONE, PT FREEPORT INDONESIA

Margaret Aubrey Larasingati, Bagus Wiyono, Singgih Saptono, Shenny Linggasari, Doli Jumat Rianto

Abstract


Area conveyor drift tambang bawah tanah DMLZ sangatlah penting dan kritis untuk kegiatan transportasi bijih, sehingga diperlukan pemantauan dan perawatan drift. Tambang bawah tanah yang semakin dalam dapat mengakibatkan penggalian bawah tanah menjadi lebih rentan terhadap kerusakan dan desain tambang menjadi lebih rapuh. Pendekatan desain ground support berdasarkan potensi deformasi ketika terjadi displacement akibat adanya tekanan perlu dilakukan karena saat ground support mengalami deformasi, masing-masing kapasitas ground support berkurang secara bertahap menjadi nol. Pendekatan tersebut dapat dikembangkan dengan implementasi Preventive Support Maintenance (PSM), dimana pemasangan tambahan ground support dilakukan sebelum area tersebut membutuhkan rehabilitasi. Penelitian dilakukan dengan pengambilan data displacement yang terjadi di tiap stasiun sepanjang area drift conveyor DMLZ menggunakan alat ukur konvergen. Data displacement kemudian diolah dan dianalisis untuk mendapatkan nilai cumulative displacement dan incremental velocity, sehingga dapat membuat klasifikasi PSM berdasarkan nilai potensi displacement dan kapasitas ground support yang telah terpasang di area tersebut. Hasil penelitian menunjukkan bahwa data pengukuran dari bulan Mei 2022 sampai dengan April 2023 tidak terjadi displacement yang signifikan. Pengaruh displacement yang terjadi sepanjang area drift conveyor DMLZ sampai saat ini belum menimbulkan kerusakan yang tampak secara visual, namun kegiatan pemantauan tetap perlu dilakukan secara berkala. Klasifikasi PSM telah dibuat berdasarkan potensi displacement, dimana action plan yang disarankan untuk PSM yaitu pemasangan ground support berupa MDX bolt sepanjang 3 m dengan spasi 1,1 m.


Keywords


ground support, displacement, preventive support maintenance

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DOI: https://doi.org/10.31315/jtp.v9i2.11877

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