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All Journal Bulletin of Scientific Contribution : Geology IJOG : Indonesian Journal on Geoscience Jurnal RISET Geologi dan Pertambangan Journal of Engineering and Technological Sciences Jurnal Teknologi Mineral dan Batubara BULLETIN OF THE MARINE GEOLOGY JKTP: Jurnal Kajian Teknologi Pendidikan Indonesian Mining Journal JURNAL METEOROLOGI DAN GEOFISIKA Indonesian Journal on Geoscience Indonesian Journal on Geoscience Devotion: Journal of Research and Community Service Jurnal Pengabdian Masyarakat Bhinneka Jurnal Teknologi Mineral dan Batubara Journal of Geosciences and Applied Geology Jurnal Meteorologi dan Geofisika Indonesian Mining Journal
Abdurrokhim ⠀
Departemen Geologi Sains, Fakultas Teknik Geologi, Universitas Padjadjaran
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Materials Science & Nanotechnology Physics Public Health Other

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Journal : Indonesian Mining Journal

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PRELIMINARY GEOMECHANICAL ANALYSIS ON LIMESTONES IN PPSDM GEOMINERBA CAMPUS, PADALARANG, WEST JAVA Irvan Sophian; Herlinawati H; Nur Khairullah; Abdurrokhim A; Iyan Haryanto; Hendarmawan H
Indonesian Mining Journal Vol 22, No 1 (2019): INDONESIAN MINING JOURNAL, Vol. 22 No. 1, April 2019
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1123.8 KB) | DOI: 10.30556/imj.Vol22.No1.2019.985

Abstract

The research location is in the PPSDM Geominerba field campus. The campus is located in Padalarang, West Java that is surrounded by the open-pit mining of limestone and marble. This limestone was formed in Oligo-Miocene of Rajamandala Formation. The research objective was to determine the condition of the slopes around the campus based on geomechanical characteristics. Based on field observations, the slope angle in the area is dominated by steep slopes. The rock hardness level is dominated by hard rock with a hardness ranging from 50-100 MPa. Rock Mass Rating shows that the area is dominated by good rocks. While the Slope Mass Rating calculation show that the maximum slope angle is between 52-75°. Level of deformation and intensive weathering process will reduce the strength of the rock in the future. Several rock fall occurrences on this research area support this assumption. Yet, some local open pit mining area activity near the toe hill of the area need to be concerned regarding the effect of the local rock fall occurrences.
SUBSIDENCE AND HEAT PROPAGATION MODELING ON THE UNDERGROUND COAL GASIFICATION (CASE STUDY AT MUARA ENIM FORMATION, SOUTH SUMATERA) Zulfahmi Zulfahmi; Ildrem Syafri; Abdurrokhim Abdurrokhim; Ridho Kresna Wattimena
Indonesian Mining Journal Vol 23, No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol23.No2.2020.1132

Abstract

One of the important issues to study underground coal gasification (UCG) is the prediction of surface subsidence. Several parameters that influence these conditions are the thickness of cap rock, the physical and mechanical characteristics, the structure condition, the minerals composition of the rock, and external conditions. This study had been carried out simulation and modeling to determine the level of surface subsidence risk and the effect of high temperatures due to the activities. The modeling results show that the thickness of the rock above the UCG coal seam greatly affects the surface subsidence. The depth is more than 200 m and found that the SF value is 1.59 which indicates UCG reactor depth of ≥ 200 m is safe from the risk of subsidence. From the characteristic aspect of the cap rock, the claystone types which not contain kaolinite minerals are more prone to collapse than those of contain kaolinite minerals. From this models, the gasifier at 150 m depth was estimated that there will be a decline of -7.23 m, and the minimum subsidence is at 275 m about 0.1 m. The heat propagation modeling results show that at 50 m the temperature is estimated to be 213- 289°C, but if the thickness of the cap rock is > 200 m depth, the temperature is around 29-28°C.
Co-Authors Adhiperdhana, Billy Gumelar Adjat Sudradjat Adjat Sudradjat Adriano Mazzini Agus Nur, Andi Agustya Agustya Ajat Sudrajat Akbar, Muhammad Miftahul Andi Agus Nur Asep Mohamad Ishaq Shiddiq Atmadibrata, Riza Atmadibrata, Riza Bernadeta Subandini Astuti Bonar Tua Halomoan Marbun Brian Christiantoro Budi Muljana Budiana, Rahmat Christiantoro, Brian Dedi Kuswandi Dicky Muslim Dwandari Ralanarko Edy Sunardi Faisal Helmi Fatmayanti, Fera Febriwan Mohamad, Febriwan Febriwan Mohammad Febriwan Mohammad, Febriwan Fercanza, Frisdio Firman Herdiansyah, Firman Firstikara, Ghania Callysta Hardjowikarto, Dharliana Ayu Hastowo Resesiyanto Hendarmawan H Hendarmawan Hendarmawan Herlinawati H Hirnawan, R. Febri Hirnawan, R. Febri Ildrem Sjafri Ildrem Syafri Ildrem Syafri Ildrem Syafri Ildrem Syafri Irvan Sophian Ismawan Ismawan, Ismawan Iyan Haryanto Iyan Haryanto, Iyan Januar Arifin Johanes Hutabarat Karyono Karyono Lia Jurnaliah Marbun, Bonar Tua Halomoan Masturyono Masturyono Mohamad Solihin, Mohamad Morang, Febrika Situ Muhammad Kurniawan Alfadli mutiara mutiara Nisa Nurul Ilmi Nugroho, Dimas Andhi Nur Khairullah Nuraeni, Tia Nursasono, Danny Panji Ridwan Petra Wattimury Popi, Popi Prasetyo, Anggit Chandra R. Febri Hirnawan Rachma, Nabila Fathiyah Resesiyanto, Hastowo Reza Muhammad Ganjar Gani, Reza Muhammad Ganjar Ridho Kresna Wattimena Ridho Kresna Wattimena Riza Atmadibrata Rohimah, Sania Saida Ulfa Saputra, Akbar Wahyudi Adi Sari Widyastuti, Sari Savitri, Cindy Dhevayani Shiddiq, Asep Mohamad Ishaq Soffian Hadi Sudarsana, Muhammad Rizki Supriyanto Rohadi Syafi'i, Abdullah Vijaya Isnaniawardhani Wahyuningsih, Amelya Andini Wattimury, Petra Yoga Adriana Sendjaja, Yoga Adriana Yuyun Yuniardi Zahran, Raihan Zaki ZULFAHMI ZULFAHMI Zulfahmi Zulfahmi