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All Journal Bulletin of Scientific Contribution : Geology Indonesian Mining Journal Buletin Sumber Daya Geologi Jurnal Geominerba Journal of Geosciences and Applied Geology Indonesian Mining Journal
Khoirullah, Nur
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Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science Materials Science & Nanotechnology Other

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Journal : Indonesian Mining Journal

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PROBABILITAS LONGSOR TIMBUNAN DI AREA IN PIT DUMP ASAM TIMUR DAERAH KONSESI PT ARUTMIN INDONESIA TAMBANG ASAMASAM, KALIMANTAN SELATAN Fahrezi, Muhammad Akmal; Zakaria, Zulfiadi; Khoirullah, Nur; Laksana, Prima
Indonesian Mining Journal Vol 28 No 1 (2025): Indoneisan Mining Journal, April 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No1.2025.1628

Abstract

Open pit mining involves excavation of soil and overburden, which requires a well-planned disposal area to maintain stockpile stability. This is achieved through an analysis of soil bearing capacity and slope stability. The research was conducted at the ASTIM In Pit Dump (IPD) using actual materials. Data were obtained from direct shear tests and physical properties tests, then statistically analyzed to determine the average value, standard deviation, and minimum and maximum relative values. These data were subsquetly input into geotechnical software to perform a slope stability analysis under pessimistic conditions, including water-saturated slopes with a horizontal seismicity coefficient of 0.045. The simulation results did not meet the stability criteria, yielding a safety factor of 0.647. Therefore, engineering design modifications were necessary, including widening the slope angle to 7.61°, consisting of six steps with a level height of 5 meters, a width of 30 meters, and a slope angle of 25°. This redesign resulted in a safety factor (SF) of 1.254 which meets slope stability criteria based on Bowles (1989) and a probability of failure (PoF) of 4.1%, in accordance with the Decree of the Minister of Energy and Mineral Resources No. 1827 K/30/MEM/2018.
Bahasa Inggris EVALUASI GEOTEKNIK KELONGSORAN DENGAN PENDEKATAN ANALISIS BALIK PADA LERENG AREA DISPOSAL PIT 'X', TANJUNG ENIM, SUMATRA SELATAN Sugiawati, Gisa Nurputri; Sophian, Raden Irvan; Alfadli, Muhammad Kurniawan; Khoirullah, Nur; Putra, Meilan Aditya
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No2.2025.1623

Abstract

In open pit mining, the main activities include excavating the material from its original state and transporting it to the disposal area or stockpile, which forms an embankment. Slope stability in the disposal area should be monitored regularly to prevent losses caused by landslides. If a landslide occurs, it is important to identify the cause as a basis for recommending new slope design and implementing appropriate engineering measures to prevent future landslide occurrences. This study was conducted on a slope that had experienced a landslide in the Pit 'X' disposal area, Tanjung Enim, South Sumatra. This study aims to analyze the cause of the landslide by using a back analysis approach. Slope stability analysis was conducted using the Morgenstern-Price boundary equilibrium method, with failure probabilities calculated using Slide 2 software. Input data consisted of cohesion, internal friction angles, and unit weight of slope material. Based on the slope stability analysis, landslides occurred on slopes with a safety factor of 1 and a 40% probability of failure. This was caused by a 67.43% decrease in cohesion caused by the water-saturated condition of the clay material and the influence of the steep slope geometry. The proposed engineering solutions include slope grading, which increases the factor of safety by 30.31%, and the addition of counterweights, which further increases the factor of safety by 32.10%.
Co-Authors abdullah, Fajar Abdurrahman, Ali Adiwijaya, Annisa Ayungingtyas Pratiwi Agung Mulyo Ahmad Helman Hamdani Al Kautsar, Muhammad Ilham Alpionisa, Salsabila Nur APRILIAN, YOGA Arma, Yadvi Aruan, Immanuel Hareanto Asykarulloh, Abdul Wahid Bakhtiar, Taufiq Bambang Hermanto Basuki, Jodi Prakoso Boy Yoseph Cahya Sunan Sakti Syah Alam Budipraja, Muhammad Ariq Chen, Reynara Davin Dandy, Leonardus Dicky Muslim Emi Sukiyah Ersyari, Jodistriawan Ersyari, Jordistriawan Fahrezi, Muhammad Akmal Fahrul Yahya, Moh Faisal Helmi Hendarmawan Hendarmawan Irvan Sophian, Irvan Ismawan Ismawan, Ismawan Jatsiah, Siti Nadia Ka'bah, Hanifan Cipta Muamar Laksana, Prima Madani, Ghoffar Cahya Mahayana, Ringkang Gumiwang MANIK, VITO ARISTO MATUZA, MUHAMMAD HERYOGA Maulana, Muhamad Arief Mohamad Sapari Dwi Hadian Monica, Utari Sonya Mubarak, Aziez Muhammad Kurniawan Alfadli Nana Sulaksana NINGRUM, WIWIN JUNITA Nurohim, Dede Pajrin, Ulfia Sari Pramudyo, Tulus Prasetio, Rio Akmal Rizky Princessca, Channia Pringgo Kusuma Dwi Noor Yadi Putra Putra, Meilan Aditya Putra, Rafino Kurnia Putri, Revena Denia Raden Irvan Sophian Rahmi, Nisa Shafira Muthia Rizki, Afdal Rukmana, Yanwar Yusup Saprana, Rifqi Dwi Shafira, Nisa Sihotang, Josua Washington Siti Khodijah Sophian, R. Irvan Sugiawati, Gisa Nurputri Syaiful Alam Taufiq, Mochamad Muslim Ulhaque, Thaha Rizal Umboro, Sindhu Waliana, Teuku Yan Waromi, Doodle Dandy Wicaksana, Kintan Adelia Arum Yohanes Tan, Yohanes Yusi Firmansyah, Yusi Yuyun Yuniardi Zakaria, Zulfiadi Zufialdi Zakaria Zulfialdi Zakaria, Zulfialdi