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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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PETA RAWAN LONGSOR DESA NANGGERANG, KECAMATAN SUKASARI, KABUPATEN SUMEDANG, JAWA BARAT MENGGUNAKAN ANALISIS KESTABILAN LERENG TIGA DIMENSI Aruan, Immanuel Hareanto; Yuniardi, Yuyun; Khoirullah, Nur; Sophian, Raden Irvan
Bulletin of Scientific Contribution Vol 22, No 2 (2024): 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.v22i2.55505

Abstract

Pada tanggal 3 Februari 2024, terjadi longsor di Desa Nanggerang, Kecamatan Sukasari, Kabupaten Sumedang, Provinsi Jawa Barat. Longsor ini terjadi di lereng persawahan masyarakat setempat. Berangkat dari hal ini, dilakukan penelitian mengenai peta kerawanan longsor lereng lokal di Desa Nanggerang untuk memberikan informasi kepada masyarakat setempat mengenai potensi longsor yang ada. Penelitian dilakukan menggunakan analisis kestabilan lereng tiga dimensi (3D) dengan perangkat Rocscience Slide 3. Geometri lereng diidentifikasi menggunakan proses fotogrametri yang diakuisisi oleh pesawat nirawak. Sedangkan lapisan yang dibagi, yaitu top soil OH, tanah MH, dan batuan andesit terlapukkan, diidentifikasi melalui observasi lapangan dan uji laboratorium mengenai sifat fisik dan mekaniknya. Dengan memasukkan index properties ke dalam model 3D lereng hasil proses fotogrametri, perhitungan kestabilan lereng menggunakan metode Janbu dilakukan untuk mendapatkan peta rawan longsor di daerah penelitian. Hasil komputasi menunjukkan, lereng di Desa Nanggerang berada pada kondisi stabil pada kondisi kering (FK = 1,5). Sedangkan pada kondisi jenuh dan pseudo-statis lereng mengalami keruntuhan (FK <1). Oleh karena itu, disarankan untuk mengefisiensikan penggunaan lahan dan aliran pada persawahan guna mengurangi risiko terjadinya longsor.
PENGARUH BIDANG DISKONTINUITAS TERHADAP KESTABILAN LERENG TAMBANG STUDI KASUS : LERENG HIGHWALL PIT’X’ PT. BERAU COAL Al Kautsar, Muhammad Ilham; Khoirullah, Nur; Hendarmawan, Hendarmawan; Umboro, Sindhu
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 8 No 2 (2023): Jurnal Geominerba - 2023
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v8i2.135

Abstract

Berau Coal is a company that currently manages open-pit coal mines, requiring geotechnical analysis. The purpose of this research is to determine the stability of slopes with and without discontinuities to understand the influence of discontinuity planes on the slopes. The method used involves classifying rock strength based on the Geological Strength Index (Marinos, 2007). In the research area, the GSI classification for sandstone and claystone ranges from <42 to >42, including classes III, IV, V, and X. Kinematic analysis, limit equilibrium analysis, and stereogram analysis are also conducted to determine the factor of safety.Based on kinematic analysis to determine the type of landslide (Wyllie & Mah, 2004), there can be a wedge failure in the highwall area. Limit equilibrium analysis is performed under two conditions: with the presence of discontinuity planes, yielding a factor of safety (FS) value of 1.636, and without the presence of discontinuity planes, yielding an FS value of 1.365. Meanwhile, the stereogram analysis yields an FS value of 3.4. In this case study, the FS value is higher when there are discontinuity planes compared to the condition without discontinuity planes. This is because the existing discontinuity planes intersect the critical slope, causing a change in the sliding plane direction towards the discontinuity plane.
NILAI KUALITAS MASSA BATUAN DENGAN METODE ROCK MASS RATING PADA AREA LOWWALL PIT X, PT. BUKIT ASAM TBK. SUMATERA SELATAN Dandy, Leonardus; Khoirullah, Nur; Hamdani, Ahmad Helman
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 8 No 2 (2023): Jurnal Geominerba - 2023
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v8i2.139

Abstract

This research is located in the Muara Enim Formation which is included in the South Sumatera Basin and this formation is a coal-bearing formation in the study area. Rock Mass Rating classification is a rock mass classification method which can be used as an initial reference for engineering geology because it describes the rock mass characteristics which assosiated with slope stability. Mining at PT Bukit Asam, Tbk. using the open pit mining method so the control process is related to slope stability. The research was conducted on lowwall slope area which was designed to follow the slope of the rock layers that have the potential for plane slides so it is important to know the characteristics of the rock mass as an initial reference for the stability of a slope. The quality of the rock mass rating is determined by the rating of each parameter which is carried out by using the scanline method as a field calculation. Based on the rating of rock mass rating, the study area is divided into three rock mass classes, rock mass class II (good rock), rock mass class III (fair rock), and rock mass class IV (poor rock).
PENGARUH ELEVASI PERMUKAAN AIR TERHADAP PROBABILITAS KELONGSORAN DAN STABILITAS LERENG TIMBUNAN DI OPEN PIT "X" PT BERAU COAL, KALIMANTAN TIMUR Maulana, Muhamad Arief; Khoirullah, Nur; Ka'bah, Hanifan Cipta Muamar; Dwi Hadian, Mohamad Sapari
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 8 No 2 (2023): Jurnal Geominerba - 2023
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

At the open pit mining, a place is needed for storing overburden material which is commonly referred as a disposal. In some cases, overburden material is stockpiled in void. Overburden material stockpiling activities require good planning. This research was conducted in the open pit "X" Site Sambarata PT. Berau Coal, East Kalimantan. The purpose of this study is to calculate the value of the safety factor of the slope, calculate the probability of failure and to analyze the effect of the water level on the slope stability. This study used the Bishop method with pseudostatic conditions and fully saturated groundwater conditions. From the results of this study it was found that the value of the slope safety factor in the study area ranged from 0.993 to 1.33 and the value of the probability of failure is 17.1 to 35.6%. The value of the factor of safety and the probability of failure is influenced by the geometry of the slope, distributed load, seismic load, and the height of the water level where the higher the water level in the pit, the value of the slope safety factor is higher and the value of the probability of failure is lower.
SLOPE STABILITY ANALYSIS USING FINITE ELEMENT METHOD (FEM) IN WARA OPEN PIT COAL MINE, PT ADARO INDONESIA, TABALONG, SOUTH KALIMANTAN Sihotang, Josua Washington; Bakhtiar, Taufiq; Khoirullah, Nur; Sophian, Raden Irvan; Zakaria, Zufialdi
Journal of Geological Sciences and Applied Geology Vol 3, No 3 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i3.25667

Abstract

The stability of slope is impacted by Rock Mass Rating, material properties, and slope geometry. Furthermore, the slope stability analysis was needed to know the slope stability condition. This research aims to know the Strength Reduction Factor (SRF) value by using Finite Element Method (FEM) using Hu=1 and Hu=Auto. The geotechnical mapping that is Rock Mass Rating (RMR) and Measured Section were done to get the Geological Strength Index (GSI) and profile of layer rocks in highwall slope SCT_J1 and SCT_J2. From the FEM analysis, actual slope SCT_J1 has the SRF=1.25 with Hu=1 and SRF=1.4 with Hu=Auto. SCT_J2 has SRF=1.21 with Hu=1 and SRF=1.3 with Hu=Auto. From the slope stability analysis, SCT_J1 and SCT_J2 were classified into stable slope due to the SRF value higher than 1.2.
ANALYSIS OF LANDSLIDE CAUSES IN NANGGERANG VILLAGE, SUKASARI SUB DISTRICT, SUMEDANG REGENCY THROUGH IDENTIFICATION LANDSLIDE SLOPE MATERIAL CHARACTERISTICS Aruan, Immanuel Hareanto; Yuniardi, Yuyun; Khoirullah, Nur; Sophian, Raden Irvan
Journal of Geological Sciences and Applied Geology Vol 8, No 1 (2024): Journal of Geological sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v8i1.56627

Abstract

On February 3, 2024, a landslide occurred in Nanggerang Village, Sukasari District, Sumedang Regency, West Java Province. The landslide took place on the slopes of local farmland. This event was investigated through an analysis of the characteristics of the landslide material collected immediately after the landslide to determine its cause and mechanism. The landslide slope was divided into three units based on the type and degree of weathering: topsoil (OH), silt soil (MH), and weathered tuff rock. Three undisturbed samples were used in laboratory experiment to determine the materials’ physical characteristics. The physical characteristics of the two soil units, which included silt-sized grains, a specific gravity of roughly 2.6, a unit weight ranging from 21 to 45 kN/m3, and a plasticity index of 16 to 20, were not substantially different, according to the results of the laboratory tests. For the tuff rock, the unit weight was 17.31, water content 48.8, and specific gravity 22.7. The laboratory test results, and studio analysis found that the high water content in the soil due to rainfall caused the two soil units to exceed their liquid limit, resulting in a translational (arc) landslide. The presence of clay minerals due to weathering acted as a catalyst for the landslide. The addition of water from heavy rainfall made the material more fluid, changing the type of landslide to an earth flow.
Analysis of Physical and Mechanical Properties of Andesite Lava Geulis Mountain Area, Jatinangor, West Java Abdullah, Fajar; Sophian, Raden Irvan; Khoirullah, Nur; Zakaria, Zufialdi; Asykarulloh, Abdul Wahid; Taufiq, Mochamad Muslim; Shafira, Nisa; Putri, Revena Denia
Journal of Geological Sciences and Applied Geology Vol 5, No 1 (2021): 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.v5i1.34851

Abstract

Jatinangor is an area composed of material from volcanic activity, one of the results of volcanic activity is andesite rock. The purpose of this research is to provide information related to the physical and mechanical properties of the lava rock in the Gunung Geulis area so that if there is construction work or rock utilization there is already information about the characteristics of the rock. The method used in this study is a laboratory experiment by conducting tests on 9 selected rock samples. The results of laboratory testing can be concluded the rock in the research area is andesite rocks and have rock physical properties namely Natural density (1.5 – 1.6 gr/cc), Saturated density (1.6 – 1.7 g/cc), Dry Density (1.5 – 1.6 g/cc), Bulk Saturated Surface Dry (SSD) Specific Gravity (2.3 – 2.4), Apparent Specific Gravity (2.5 – 2.7), absorption (3 – 5.9%), Natural moisture content (0.6 – 2.3%),  Porosity (4.9 – 9.4%) and the mechanical properties of the rock, namely the compressive strength of the rock, ranged from 33,099 – 85,096 Mpa. Based on the results and analysis, the mechanical properties of rocks, namely the compressive strength of rocks in the study area, have varying values and varied physical properties of rocks. Physical and mechanical properties of rocks that are correlated based on linear correlation are the compressive strength of rocks with absorption, Natural moisture content, and porosity. These parameters will show the relationship that can affect the compressive strength of rocks. So that when using rock in construction work, mining, the use of rock needs to pay attention to the compressive strength or mechanical properties and physical properties of the rock.
Liquefaction Potential based on Earthquake History in Sanana Region, Sula Island Regency, North Maluku, Indonesia Pajrin, Ulfia Sari; Zakaria, Zufialdi; Sophian, Raden Irvan; Khoirullah, Nur; Mubarak, Aziez; Basuki, Jodi Prakoso
Journal of Geological Sciences and Applied Geology Vol 3, No 1 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i1.21947

Abstract

Sula Islands is a region in Maluku Province that is very vulnerable to earthquakes because it is located on an active seismic line. One of the disasters that often accompanies earthquakes is liquefaction. Sandy soil in a saturated condition will lose its strength when an earthquake occurs, thus endangering the building above it. The aim of the study was to determine seismicity and estimate the liquefaction potential of the earthquake history and CPT test in the Sanana region and its surroundings. The method in this study uses a "simplified procedure" method for evaluating liquefaction resistance of soils. 2 main parameters were sought in this study, CSR obtained based on tectonic conditions and a history of seismicity and CRR obtained from the results of CPT testing. The results showed that seismicity in the Sanana region was sourced from Sula-Sorong active fault activity with a history of the greatest magnitude of 8.1 and 7.7. As for the calculation results from CPT data, the Sanana area has the potential for liquefaction of sand medium material at a depth of 5-12 m for earthquakes with magnitude 7.5 and 4 -12 m in magnitude 7.7 and 8.1. The potential for liquefaction in this area is caused by the type of saturated medium sand material and this location which is close to the active fault activity of Sula-Sorong. Therefore, it is necessary to evaluate the potential for liquefaction in planning, building and developing infrastructure in earthquake-prone areas so that disasters of liquefaction can be prevented.
Shallow Bearing Capacity in Cilengkrang, Bandung, West Java, Indonesia Khoirullah, Nur; Adiwijaya, Annisa Ayungingtyas Pratiwi; Sophian, Irvan; Mulyo, Agung; Muslim, Dicky; Zakaria, Zufialdi
Journal of Geological Sciences and Applied Geology Vol 3, No 3 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i3.26226

Abstract

Cilengkrang is located on the eastern side of Bandung City, West Java Indonesia. This area is surrounded by the district of Cimenyan, Cijambe, Cileunyi, and Ujung Berung. The population growth in Cilengkrang area has experienced 1.8% over the last six years as evidenced by the quantity of new housing complexes being built. Due the limitations on available land the development of housing complex is predicted settled in Cilengkrang District. This paper is aimed to determine the characteristic of shallow bearing capacity foundation, as an important factor on constructing a housing complex. To analyze shallow bearing capacity, the soil mechanics data is tested in the laboratory. These samples are taken in 14 sites distribute randomly.  Based on the field mapping, the soil that covers the research area is dominated by fine-grained soil as the residual and transported soil product of young and old volcanic products. Based on Universal Classification of Soil (USCS), the high plasticity silt (MH) is dominating this area than the low plasticity silt (ML) and high plasticity clay (CH). Based on shallow bearing capacity foundation data, the allowable bearing capacity in this area ranging from 19.42 to 70 Ton/m2 on square footing. The circular footing values ranging from 19.35 to 69.93 Ton/m2, and continuous footing values ranging from 15.47 to 52.77 Ton/m2.
DISPOSAL LIQUEFACTION POTENTIAL ANALYSIS BASED ON WASTE DUMP STABILITY RATING HAZARD CLASSIFICATION SYSTEM (WSRHC) METHOD AT DISPOSAL TAMBANG AIR LAYA, SOUTH SUMATRA Aprilian, Yoga; Zakaria, Zufialdi; Khoirullah, Nur; Ersyari, Jodistriawan; Chen, Reynara Davin
Journal of Geological Sciences and Applied Geology Vol 5, No 3 (2021): 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.v5i3.38039

Abstract

South Tambang Air Laya Disposal is an inpit disposal located in an active tectonic area adjacent to the active Sumatran Fault Zone. Area's support this with a peak acceleration value of 0.2 – 0.25. One of the causes of liquefaction is the presence of shocks or earthquakes. For this reason, it is necessary to analyze the liquefaction potential to determine the liquefaction potential, especially in the disposal material and the disposal foundation of the research area. The method used in this research is the Waste Dump Stability Rating Hazard Classification System; this method is used to assess the liquefaction potential at the disposal, divided into two parts, namely the liquefaction potential at the foundation and the liquefaction potential at the disposal material. The data used in this research include secondary data from seismic factor data, South Sumatra earthquake zone data, South Sumatra liquefaction zone data, and laboratory test results of disposal foundations. In addition, data on the results of physical and mechanical properties of the disposal material were used in the form of grain size gradation data and data from plasticity test results. All the data used shows that the liquefaction potential of the disposal foundation is included in a negligible category with a rating value of 0. Meanwhile, the potential for liquefaction of disposal material is included in the low category with a rating value of -2.5, which must still be considered to avoid unexpected things that can occur.
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