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All Journal Bulletin of Scientific Contribution : Geology Jurnal Teknologi Mineral dan Batubara Journal of Geoscience, Engineering, Environment, and Technology Indonesian Mining Journal Prosiding Temu Profesi Tahunan PERHAPI Jurnal Geosains West Science Jurnal Teknologi Mineral dan Batubara Journal of Geosciences and Applied Geology
Raden Irvan Sophian
Fakultas Teknik Geologi, Universitas Padjajaran
Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology Physics

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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.
BIO-ENGINEERING, MELALUI PEMANFAATAN TANAMAN KALIANDRA (CALIANDRA CALOTHYRSUS) DI WILAYAH ZONA RAWAN LONGSOR JAWA BARAT -, Zufialdi Zakaria; -, Dicky Muslim; -, Raden Irvan Sophian; -, Sondi Kuswaryan; -, Ujang Hidayat Tanuwiria
Bulletin of Scientific Contribution Vol 11, No 3 (2013): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (433.022 KB) | DOI: 10.24198/bsc.v11i3.8297

Abstract

Landslides prone areas can be occur due to a large slope, open slopes, large erosion rate, or a large infiltration. Landslide prone areas can be prevented by a stable slope engineering. Engineering of stable slopes can be integrated through a variety of methods with preliminary procedure : 1) Mapping of landslides prone areas, 2) Slope stability analysis through the study of Safety Factor, 3) Engineering of slope stabilization and integrated through the simulation stable slope, slope design and other engineering, 4) Environmental management and environmental monitoring, 5) Bio-engineering by utilizing plants as part of a stable slope engineering systems, namely as a preventive agent of erosion, reduction of infiltration and runoff flow, landslide prevention as well as strengthening the slopes . Engineering can use the model of Starlet (Stabilisati dan Rancangbangun Lereng Terpadu, or Engineering of Slope Stabilization and Integrated) involving the role of government officials, industrial and businessmen , residents / communities , and scientists . Kaliandra chosen to be a plant that is part of a stable slope engineering . Kaliandra plants have a good root, the tree canopy is not heavy, high-protein leaves for fodder, stems and twigs are dried for energy (fuelwood ) . These plants, in addition to prevention of landslides, will be useful for people and industry. 
Pemetaan Digital Perbukitan Sukalilah: Teknologi Drone, Fotogrametri, dan (Ground Control Point ) GCP untuk Kebun Buah & Drainase Mata Air Sukaresmi Hadian, Mohamad Sapari Dwi; Sophian, Raden Irvan; Rustikadara, Taufik; Sunarie, Cecep Yandri
Jurnal Geosains West Science Vol 3 No 02 (2025): Jurnal Geosains West Science
Publisher : Westscience Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58812/jgws.v3i02.2108

Abstract

Penggunaan teknologi drone dan fotogrametri semakin populer dalam berbagai aplikasi pemetaan dan survei, terutama di daerah yang memiliki topografi kompleks seperti perbukitan. Teknologi ini menawarkan solusi yang efisien dan akurat untuk menghasilkan peta digital dengan resolusi tinggi, yang sangat diperlukan dalam berbagai proyek pembangunan dan pengelolaan lahan.  Pemanfaatan teknologi drone dan fotogrametri dengan kerangka Ground Control Point (GCP) untuk menghasilkan pemetaan digital yang akurat dan detail di daerah perbukitan Sukalilah, Kabupaten Garut. Studi kasus ini berfokus pada pengembangan kebun buah dan persiapan sistem drainase dari Mata Air Sukaresmi, Metode yang di gunakan dalam penelitian ini adalah mencoba mengembangkan data dari hasil foto udara dengan memanfaatkan data Digital Surface Model (DSM) yang di olah menjadi Digital Terrain Model (DTM), dimana data DSM masih berupa data ketinggian bangunan, pohon dan lain-lain, sehinggga untuk menghasilkan Digital Terrain Model (DTM) diperlukan proses filtering menggunakan software Saga Gis untuk menghilangkan ketinggian pohon, bangunan, dan menganalisa jalur drainase air untuk  meyiraman kebun, Data DTM tersebut dijadikan dasar untuk pemodelan 3D piping air, hasil yang diharapkan dapat meningkatkan efektivitas dan efisiensi dalam pengembangan kebun buah serta pengelolaan sumber daya air dan memberikan kontribusi pada peningkatan kesejahteraan masyarakat setempat sehingga penelitian ini memberikan kontribusi yang signifikan terhadap pengelolaan lahan dan sumber daya air di daerah perbukitan Sukalilah, meningkatkan efisiensi dan produktivitas pertanian, serta menyediakan model penerapan teknologi yang dapat direplikasi di wilayah lain.  
Influence of weathering on the mechanical strength and factor of safety of andesitic rocks in the Gunung Geulis area, Jatinangor, West Java, Indonesia Shah, Bilal; Muslim, Dicky; Sophian, Raden Irvan
Journal of Geoscience, Engineering, Environment, and Technology Vol. 11 No. 02 (2026): JGEET Vol 11 No 02 : June (2026)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2026.11.02.25868

Abstract

Weathering gradually alters the physical character and engineering performance of volcanic rocks, including andesite, which is commonly found and frequently used for construction and slope-related works within the Gunung Geulis region of Sumedang Regency, Indonesia. To examine how these changes affect mechanical behavior, this study compared the estimated uniaxial compressive strength (UCS) and the resulting factor of safety (FOS) of andesite across different weathering grades. Seventy-eight samples were collected from three geological segments, representing slightly to moderately weathered (Grade II–III) and highly weathered (Grade IV). Point Load Tests (PLT) were performed on all samples, and the resulting indices were converted to estimated UCS values using an empirical correlation. Statistical analyses, including descriptive analysis, the Mann–Whitney test, and two-factor analysis, were performed to assess strength differences between weathering grades and geological segments. These estimated UCS values were then converted into shear-strength parameters through the Generalized Hoek–Brown approach, and the corresponding cohesion and internal friction angle were obtained using RocLab 1.0 software for slope-stability modelling in Slide2. The results show a consistent and marked decline in strength as weathering progresses; overall, the estimated UCS decreases by 59.22% across all investigated segments, demonstrating that increasing weathering reduces the rock strength by more than half. This reduction in rock-mass strength is reflected in the slope-stability analyses, where slopes composed of SW–MW andesite produced FOS values ranging from 3.518 to 4.271, indicating relatively stable slope conditions, whereas HW andesite yielded lower FOS values ranging from 1.191 to 1.307, representing comparatively lower and marginally stable conditions. These findings demonstrate that progressive weathering significantly reduces the mechanical performance and slope stability of andesitic rock in the Gunung Geulis area.
Bahasa Inggris EVALUASI GEOTEKNIK KELONGSORAN DENGAN PENDEKATAN ANALISIS BALIK PADA LERENG AREA DISPOSAL PIT 'X', TANJUNG ENIM, SUMATRA SELATAN Gisa Nurputri Sugiawati; Raden Irvan Sophian; Muhammad Kurniawan Alfadli; Nur Khoirullah; Meilan Aditya Putra
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 Abdurrokhim, . Adi Hardiyono Alifahmi Alifahmi, Alifahmi Alpionisa, Salsabila Nur Aruan, Immanuel Hareanto Asykarulloh, Abdul Wahid Audrey, Lizzy Evsa Bakhtiar, Taufiq Basuki, Jodi Prakoso Boy Yoseph Cahya Sunan Sakti Syah Alam Budipraja, Muhammad Ariq Cecep Yandri Sunarie Damanhuri, Hilman Dicky Muslim Emi Sukiyah Ersyari, Jordistriawan Faisal Akbar Nasution Faisal Helmi Gilang Perwira Adi Gisa Nurputri Sugiawati Hendarmawan, . Iskandar . Iyan Haryanto Jamil, Aliyuddin Jodistriawan Ersyari Jodistriawan Ersyari Khoirullah, Nur Madani, Ghoffar Cahya Malik Muhammad, Kemal MANIK, VITO ARISTO Manullang, Sahala MATUZA, MUHAMMAD HERYOGA Meilan Aditya Putra Mohamad Sapari Hadian Monica, Utari Sonya Mubarak, Aziez Muhammad Kurniawan Alfadli NINGRUM, WIWIN JUNITA Nur Khoirullah Nur Khoirullah Pajrin, Ulfia Sari Pradnya Paramarta Raditya Rendra Prasetio, Rio Akmal Rizky Prasetyo, Rahmat Dwi Putra, Rafino Kurnia Putri, Revena Denia Rahmi, Nisa Shafira Muthia Reynara Davin Chen Rizki, Afdal Rustikadara, Taufik Sapari Dwi Hadian, Sapari Dwi Shafira, Nisa Shah, Bilal Sholtan, Devanya Anantasya Sihotang, Josua Washington Siti Khodijah Siti Khodijah Sondi Kuswaryan Taufiq, Mochamad Muslim Ujang Hidayat Tanuwiria Ulhaque, Thaha Rizal Utari Sonya Monica Wahyuzi, Radhi Yusi Firmansyah, Yusi Yuyun Yuniardi Zakaria, Zulfiadi Zufialdi Zakaria Zulfialdi Zakaria, Zulfialdi