Perencanaan Counterweight untuk Meningkatkan Kestabilan Lereng dan Kapasitas Disposal pada Area Disposal T4 PT Unggul Dinamika Utama Provinsi Kalimantan Timur
DOI:
https://doi.org/10.61132/globe.v4i1.1318Keywords:
Counterweight, Disposal, Geotechnical engineering, Limit Equalibrium Method, Mine disposal areaAbstract
The stability of disposal slopes is a critical aspect of open-pit mining operations because it directly affects operational safety and the continuity of overburden dumping activities. Disposal areas composed of overburden materials generally exhibit heterogeneous characteristics, particularly when soft materials such as mud are present, which can significantly reduce slope stability. Therefore, a comprehensive slope stability evaluation is required prior to further disposal development. This study aims to assess the stability condition of a disposal slope under initial conditions, evaluate the influence of material conditions, and analyze the effectiveness of counterweight application in improving both the safety factor and disposal capacity. The research methodology involved the collection of primary and secondary data, including slope geometry, lithological conditions, and the physical and mechanical properties of disposal materials obtained from laboratory testing and company technical data. Slope stability analysis was performed using the limit equilibrium method with the assistance of geotechnical software, taking into account groundwater conditions and operational loading.
The analysis results indicate that the initial disposal condition yielded a safety factor of 0.718, indicating an unstable slope condition. After simulating the removal of mud material, the safety factor increased to 0.907 but remained below acceptable stability criteria. The application of a counterweight significantly improved slope stability, resulting in a safety factor of 1.498. Further optimization through slope geometry redesign produced a final safety factor of 1.101, which satisfies the requirements stipulated in KEPMEN ESDM No. 1827 K/30/MEM/2018. Additionally, the redesign increased the disposal capacity from 119,507,864.23 LCM to 119,682,378.22 LCM, representing an increase of 174,513.99 LCM. These results demonstrate that counterweight application combined with geometric optimization is effective in enhancing both slope stability and disposal capacity.
References
Ababil, Y. N. (2025). Analisis kestabilan lereng disposal ex void pit XX di PT Bina Sarana Sukses jobsite PT Batu Rona Adimulya Kecamatan Babat Supat, Kabupaten Musi Banyuasin, Provinsi Sumatera Selatan (Skripsi). Universitas Jambi.
Arif, I. (2016). Geoteknik tambang. PT Gramedia Pustaka Utama.
Arirupa, G. (2021). Analisis kestabilan lereng dengan permodelan numerik menggunakan metode elemen hingga (Skripsi). Universitas Hasanuddin.
Das, B. M. (1995). Mekanika tanah: Prinsip-prinsip rekayasa geoteknis. The University of Texas at El Paso.
Das, B. M. (2006). Principles of geotechnical engineering (5th ed.). Cengage Learning.
Garini, A. D. W., Trides, T., Hasan, H., Oktaviani, R., & Pontus, A. J. (2024). Studi kestabilan lereng highwall berdasarkan metode kesetimbangan batas di CV Gudang Hitam Prima Kecamatan Sanga Sanga Kabupaten Kutai Kartanegara. Jurnal Inovasi Global, 2(2). https://doi.org/10.58344/jig.v2i2.63
Kementerian Energi dan Sumber Daya Mineral Republik Indonesia. (2018). Keputusan Menteri ESDM Nomor 1827 K/30/MEM/2018 tentang pedoman pelaksanaan kaidah teknik pertambangan yang baik: Lampiran II pedoman pengelolaan teknis pertambangan.
Morgenstern, N. R., & Price, V. E. (1965). The analysis of the stability of general slip surfaces. Géotechnique, 15(1), 79–93.
Pradana, T. A., Trides, T., Nugroho, W., Oktaviani, R., Pontus, A. J., Ismail, A., & Winonazada, R. (2025). Studi penggunaan counterweight sebagai perkuatan pada lereng disposal IPD di Pit 302 PT Jembayan Muarabara Kecamatan Marangkayu Kabupaten Kutai Kartanegara Provinsi Kalimantan Timur.
Rai, M. A., Kramadibrata, S., & Wattimena, R. K. (2014). Mekanika batuan. Institut Teknologi Bandung.
Saputra, A. (2022). Perencanaan penimbunan disposal penambangan batubara Pit Ulakpandan Utara di PT Bumi Merapi Energi, Lahat, Sumatera Selatan. Indonesian Mining and Energy Journal, 5(2), 60–64. https://doi.org/10.25105/imej.v5i2.15937
Standar Nasional Indonesia. (1994). SNI 03-3637-1994: Metode pengujian berat isi tanah dengan cetakan benda uji.
Standar Nasional Indonesia. (2008a). SNI 1964:2008: Cara uji berat jenis tanah.
Standar Nasional Indonesia. (2008b). SNI 1965:2008: Metode pengujian kadar air tanah.
Standar Nasional Indonesia. (2016). SNI 3420:2016: Metode kuat geser langsung tanah tidak terkonsolidasi dan tidak terdrainase.
Standar Nasional Indonesia. (2019). SNI 1727:2019: Tata cara perencanaan ketahanan gempa untuk struktur bangunan gedung dan nongedung.
Subianto, S., Triantoro, A., & Riswan. (2018). Analisis kestabilan lereng dan plan disposal pada Pit Mulia PT Arutmin Indonesia Kecamatan Kintap Kabupaten Tanah Laut Kalimantan Selatan. Jurnal Pertambangan, 75–83. https://doi.org/10.20527/jg.v4i2.5162
Takwin, G. A., Turangan, A. E., & Rondonuwu, S. G. (2017). Analisis kestabilan lereng metode Morgenstern–Price studi kasus Diamond Hill Citraland. Jurnal Tekno, 15(67).
Terzaghi, K., & Peck, R. B. (1967). Soil mechanics in engineering practice (2nd ed.). Wiley
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