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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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ANALYSIS OF GEOMORPHOLOGICAL ASPECTS OF SURADE SUB-DISTRICT, SUKABUMI DISTRICT, WEST JAVA Firmansyah, Yusi; Khoirullah, Nur; Fahrul Yahya, Moh
Journal of Geological Sciences and Applied Geology Vol 7, No 1 (2023): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v7i1.49334

Abstract

The current form of the earth's surface romance is the result of geological processes that have taken place during the geological period which can show how the characteristics and distribution of the constituent rocks. This research was conducted to find out how the geomorphological conditions by analyzing the aspects of morphography, morphometry, and morphogenetics as a form of geomorphology in an area. The research location is in Mekarjaya Village, Ciemas Sub-district, Sukabumi Regency, West Java, which has geomorphological conditions influenced by the activity of an old submarine volcano which was then uplifted and experienced an intensive tectonic process. The method used in this study combines qualitative and quantitative aspects supported by satellite imagery, data processing applications, and references from previous research results. The results of this study show that there are 2 geomorphological units, namely the Slightly Steep Volcanic Hills Unit and the Steep Volcanic Hills Unit with the distribution of andesitic lava and volcanic breccia rocks. The drainage pattern that develops is rectangular.
AKTIVITAS TEKTONIK BERDASARKAN KARAKTERISTIK MORFOMETRI DI DAS CIBANTEN, PROVINSI BANTEN MATUZA, MUHAMMAD HERYOGA; Sophian, Raden Irvan; Khoirullah, Nur
Bulletin of Scientific Contribution Vol 19, No 3 (2021): Bulletins of Scientific Contribution : Geology
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v19i3.35942

Abstract

Daerah penelitian secara geografi berada di DAS Cibanten, Serang, provinsi Banten. Daerah ini terdiri dari batuan vulkanik kwarter, memiliki kenampakan alam yang bervariasi dan juga terdapat sesar di sekitar daerah penelitian. Penelitian dilakukan dengan menggunakan data sekunder.  Daerah penelitian dipelajari untuk mengetahui kondisi geologi, identifikasi aktivitas tektonik dengan analisis kuantitatif pada parameter morfometri berupa rasio percabangan sungai (Rb), indeks gradien sungai (SL), asimetri pengaliran (AF) bentuk sungai (Bs), serta sinusitas muka gunung (Smf). Pola kelurusan sungai dominan berorientasi barat laut-tenggara Dari keenam parameter diperoleh nilai yang menunjukkan daerah penelitian memiliki tingkat aktivitas tektonik yang bervariasi, dari aktif hingga tidak aktif, dan dominan pada tingkat aktivitas tektonik rendah hingga tidak aktif.
PENENTUAN KESTABILAN LERENG MENGGUNAKAN KUALITAS MASSA BATUAN PADA AREA LOWWALL PIT X PT. BUKIT ASAM TBK SUMATRA SELATAN Khodijah, Siti; Monica, Utari Sonya; Ersyari, Jordistriawan; Khoirullah, Nur; Sophian, Raden Irvan
Bulletin of Scientific Contribution Vol 20, No 3 (2022): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v20i3.42691

Abstract

Daerah penelitian memiliki kondisi geologi yang cuku kompleks yaitu termasuk ke cekungan Sumatra Selatan. Formasi Muara Enim merupakan formasi penghasil batubara ekonomis pada daerah penelitian. Proses penambangan pada PT. Bukit Asam Tbk yaitu metode tambang terbuka sehingga proses penggaliannya berhubungan dengan kestabilan lereng dan sifat keteknikannya. Pit X diiterpretasikan sebagai sayap antiklin utara Muara Tiga Besar dengan jurus perlapisan batuan relatif ke arah barat laut sehingga memiliki bentuk pit relatif searah jurus perlapisan batuan. Area lowwall sebagai lereng yang didesain mengikuti kemiringan perlapisan batuan menjadi ketertarikan dalam melakukan penelitian dikarenakan berpotensi tinggi terjadi longsoran bidang sehingga perlu dilakukan analisis kualitas massa batuannya. Metode Rock Mass Rating merupakan pembobotan bersistem dalam menentukan kualitas massa batuan dan dapat digunakan untuk menilai stabilitas lereng dan rekomendasi sudut aman maksimal yang dapat diterapkan melalui Slope Mass Rating. Kaitannya dengan kualitas massa batuan, dilakukan pengamatan pada 8 titik massa batuan selain batubara pada area lowwall Pit X menggunakan metode scanline. Berdasarkan pembobotan rock mass rating, daerah penelitian terdiri dari 2 (dua) kelas massa batuan yaitu kelas III (fair rock) dan IV (weak rock). Berdasarkan slope mass rating, daerah penelitian terdiri dari lereng bad dengan stabilitas tidak stabil dan lereng normal dengan stabilitas stabil sebagian. Adapun sudut lereng yang direkomendasikan pada area lowwall berkisar antara 30°-34°. Kata kunci: area lowwall, massa batuan, RMR, SMR, sudut aman lereng
STATIC AND PESUDOSTATIC SLOPE ANALYSIS USING MORGENSTER-PRICE METHOD (Study case Embung Unpad, Jatinangor, West Java, Indonesia) Khoirullah, Nur; Mahayana, Ringkang Gumiwang; Sugiawati, Gisa Nurputri; Sophian, R. Irvan
Bulletin of Scientific Contribution Vol 23, No 1 (2025): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v23i1.60252

Abstract

Infrastructure areas require preliminary geotechnical analysis, which includes slope design and periodical evaluation for assessing changes in geotechnical conditions due to the influence of earthquake loads, human activities, and environmental changes. Factors such as rainfall, groundwater level and earthquake vibrations play an important role in influencing slope stability, so slope stability analysis is an aspect that needs to be considered in geotechnical engineering, especially in areas prone to seismic activity. This research aims to evaluate slope stability using the Morgenstern-Price method, which combines static and pseudo-static conditions to assess the impact of seismic loads. This research focuses on analyzing slope stability in the Embung Unpad area, Jatinangor, which is located in a seismically active zone. The slope is characterized by volcanic soil derived from weathered young volcanic rocks, with slopes varying from moderate to steep. This research focuses on comparing 2D and 3D analysis approaches to determine their accuracy and reliability in capturing critical slope stability factors in seismic scenarios. In the analysis, the stability of the slope is calculated using the statistical-probabilistic method to determine the percentage of slope failure. The simulation results show that the stability analysis using the 3D approach produces a higher safety value than the 2D approach, namely FoS value of 0.955 in 3D analysis and FoS value of 0.913 in 2D analysis. 3D analysis is generally able to capture the complexity of slope geometry and parameters more thoroughly than 2D approach, one of which can evaluate the landslide mechanism in 3D characterized by the landslide volume that can occur. However, since the 3D model in this study is the result of 2D extrude model and consists of 1 material, the model in this study has lower complexity than if the constituent materials are heterogeneous. However, this study has the limitation that the 3D model is the result of extruded volume from 2D geometry with the result that the difference in FoS value is relatively similar between 3D and 2D models. This research highlights the importance of detailed analysis of slope safety risks in seismically active areas to ensure the sustainability and safety of surrounding infrastructure.
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.
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.
KARAKTERISTIK FISIK DAN MEKANIK TANAH MENGANDUNG MINERAL TIMAH DI DAERAH LAUT PAYAKUNDUR, PROVINSI KEPULAUAN RIAU Khoirullah, Nur; Sophian, Irvan; Muslim, Dicky; Arma, Yadvi
Buletin Sumber Daya Geologi Vol 10 No 1 (2015): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v10i1.137

Abstract

Sifat fisik dan mekanik material (batuan ataupun tanah) merupakan sifat penting dalam memahami kekuatan dan karakteristik material. Daerah penelitian terletak pada Laut Payakundur dikenal sebagai Tin Belt of Sumatera yang kaya akan kandungan timah. Penelitian ini bertujuan untuk mengetahuikarakteristik fisik dan mekanik tanah yang dapat menunjang data pemboran geologi. Metode yang digunakan dalam penelitian ini merupakan penelitian lapangan melalui uji penetrasi standar dan sampel yang terambil diuji di laboratorium guna mendapatkan nilai sifat fisiknya. Karakteristik tanah yang ditemukan diklasifikasikan ke dalam USCS menjadi tanah CL, CH, SC, danSW. Nilai kadar air berkisar dari 13-80%. Nilai berat jenis berkisar dari 2,53-2,74. Nilai berat isi berkisar dari 14,7 sampai 21,5 KN/m 3 . Nilai N-SPT lapangan dikoreksi menjadi 70 % energi standar. Karakteristik sifat fisik tanah lokasi penelitian banyak dipengaruhi oleh air, sehingga menyebabkannilai kadar air yang cukup tinggi terutama pada tanah lempung. Pada satuan SW terdapat mineral cassiterite dan didominasi oleh bentuk butiran yang subangular yang diinterpretasikan tertransportasi dekat dari sumbernya. Korelasi dari nilai N-SPT dapat mengetahui nilai mekanika tanahnya namun ujilaboratorium untuk mekanika tanah tetap diperlukan 
Co-Authors abdullah, Fajar Abdurrahman, Ali Adiwijaya, Annisa Ayungingtyas Pratiwi Agung Mulyo Ahmad Helman Hamdani, Ahmad Helman Al Kautsar, Muhammad Ilham Alam, Boy Yoseph Cahya Sunan Sakti Syah Alpionisa, Salsabila Nur APRILIAN, YOGA Arma, Yadvi Aruan, Immanuel Hareanto Asykarulloh, Abdul Wahid Bakhtiar, Taufiq Bambang Hermanto Basuki, Jodi Prakoso Budipraja, Muhammad Ariq Chen, Reynara Davin Dandy, Leonardus Dicky Muslim Dwi Hadian, Mohamad Sapari Emi Sukiyah Ersyari, Jodistriawan Ersyari, Jordistriawan Fahrezi, Muhammad Akmal Fahrul Yahya, Moh Faisal Helmi Hendarmawan 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 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, Rafino Kurnia Putri, Revena Denia Raden Irvan Sophian, Raden Irvan 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, Zufialdi Zulfialdi Zakaria, Zulfialdi