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All Journal Bulletin of Scientific Contribution : Geology Dharmakarya : Jurnal Aplikasi Ipteks Untuk Masyarakat Jurnal Ilmiah Dinamika Rekayasa (DINAREK) Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Buletin Sumber Daya Geologi Kumawula: Jurnal Pengabdian Kepada Masyarakat Journal of Geosciences and Applied Geology BACA: Jurnal Dokumentasi dan Informasi Jurnal Geosaintek
Zufialdi Zakaria, Zufialdi
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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.
Erosion Potential Based on Erodibility Factors In Cimanggung And Surrounding Region, Sumedang Regency, West Java, Indonesia Rahmi, Nisa Shafira Muthia; Sophian, Raden Irvan; Khoirullah, Nur; Zakaria, Zufialdi
Journal of Geological Sciences and Applied Geology Vol 5, No 2 (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.v5i2.34661

Abstract

The research area around Gunung Geulis has been shifted from agricultural land into residential areas. This transformation eventually will affect the water infiltration process especially throughout the rainy season and can cause the intensity of the erosion rate to go higher. Soil erodibility is defined as the susceptibility of the soil to erosion, as the degree to which a soil is easily eroded or not. This research was conducted to determine the erodibility value in an area of ± 25 km2 which administratively belongs to the Districts of Cimanggung and Jatinangor, Sumedang Regency, West Java Province. The erodibility value can be calculated by the method introduced by Wischmeier and Smith (1978) and it is determined based on several parameters, namely texture of the soil, soil structure, permeability value, and organic (%C) content in a soil sample. The research data was obtained by engineering geological mapping of the distribution of surface soil, taking undisturbed soil samples using the hand auger method, and laboratory tests in the form of testing the physical properties of the soil. Then several laboratory tests are conducted to identify the physical properties of soil such as organic (%C) content analysis using Walkley and Black method, grain size analysis, hydrometer analysis, and permeability analysis using the falling head method. In the research area, the soil type is divided into two units, namely the Low Plasticity Silt Unit and the High Plasticity Silt Unit. Soil erodibility values around Gunung Geulis ranged from 0.118 to 0.514 0,1-ton acre hour/acre foot-ton inch which was included in the classification of a low, medium, moderately high, and high erodibility levels according to US customary dimensions.
Slope Stability Analysis on Muaraenim Formation, South Sumatera, Indonesia Ulhaque, Thaha Rizal; Khoirullah, Nur; Sophian, Raden Irvan; Zakaria, Zufialdi
Journal of Geological Sciences and Applied Geology Vol 3, No 2 (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.v3i2.23206

Abstract

Slope stability analysis is a necessary aspect in open mining operations. The research location is in the Muaraenim Formation, South Sumatra, Indonesia. In this study, the level of slope stability is determined by the value of the Safety Factor (FS). The method used is limit equilibrium, the Spencer method. The results of this study indicate that FS values are influenced by the angle of the slope, where with decreasing degree of slope, the FS value will increase. In addition, the FS value is also directly proportional to the cohesion value of the slope materials.
Geotechnical Evaluation of Landslide in Nanggerang Village Tan, Yohanes; Zakaria, Zufialdi; Ismawan, Ismawan; Sophian, Irvan; khoirullah, Nur
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.v8i1.56822

Abstract

Landslides are significant geological events that can cause extensive damage to infrastructure, disrupt communities, and pose serious safety hazards. Understanding the mechanisms behind slope failures is crucial for effective risk mitigation and the development of engineering solutions to improve slope stability. According to data from the National Disaster Management Agency (BNPB), Indonesia experienced 83 landslide events from January to February 2024. A notable landslide occurred in Nanggerang Village, Sukasari Sub-district, Sumedang Regency, West Java Province, on February 3, 2024. This landslide happened in a terraced rice field area following heavy rainfall earlier in the day. This study focuses on evaluating the failed slope to understand its condition just before failure and the material properties that influence the landslide event. The research methodology includes field data collection, soil testing, and slope stability analysis using the Limit Equilibrium Method (LEM) with a probabilistic approach via Slide 2 software. The analysis revealed that the failed slope had an average safety factor (FS) of 0.968 and a landslide probability of 58.897%. Sensitivity analysis showed that the cohesion parameter in the soil layer (CWZ) significantly impacts the safety factor of the slope. The study concludes that the reduction in soil cohesion and internal friction angle due to excessive moisture was the primary cause of the landslide, and the cohesion parameter of the soil layer is the most sensitive factor affecting slope stability.
CORRELATION BETWEEN OVERALL SLOPE AND SLOPE STABILITY OF HIGHWALL IN PIT TUNGGAL, BORNEO MANIK, VITO ARISTO; NINGRUM, WIWIN JUNITA; KHOIRULLAH, NUR; SOPHIAN, RADEN IRVAN; ZAKARIA, ZUFIALDI
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.v3i1.22030

Abstract

Slope stability is an important aspect of the mining operation. Hence, an in-depth understanding of slope stability and variable that affect it is very crucial.  This research was conducted in pit tunggal, Borneo. The aim of this research is to identify the correlation between overall slope and slope stability in highwall slope at pit tunggal. Slope stability analysis was conducted with SLIDE V 6.00 software using Morgenstern-Price’s limit equilibrium method. The result of this research shows that, as the highwall slope gets steeper, the slope stability represented by a factor of safety (FS) may decrease. Otherwise, when the highwall slope gets declivous, the factor of safety may increase.
SOIL ERODIBILITY AND ITS EROSION POTENTIAL IN SADAWARNA DAN AND SURROUNDING AREA, CIBOGO DISTRICT, SUBANG REGENCY, WEST JAVA PROVINCE Alpionisa, Salsabila Nur; Zakaria, Zufialdi; Khoirullah, Nur; Sophian, Raden Irvan; Firmansyah, Yusi
Journal of Geological Sciences and Applied Geology Vol 7, No 2 (2023): 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.v7i2.49995

Abstract

The Sadawarna Dam and its surroundings, which are located in Subang Regency, are currently under construction. Change in land use caused by the construction occurred. Land management and soil conservation are needed to prevent uncontrolled erosion because it can caused slopes in critical condition, flood occurred in the downstream areas of river, and silting of dam. One of the information in land management and soil conservation is by identifying the soil erodibility which aims to find out the sensitivity of the soil to erosion in the research area. Soil erodibility affected by grain size distribution, soil structure, soil organic matter, and soil permeability. In this research area, the soil erodibility was calculated based on disturbed sample in the field which was then tested in the laboratory. The laboratory tests include sieve analysis, hydrometer analysis, and %c organic. Soil permeability obtained from previous studies. The research area is dominated by clay-sized soil which are the result of weathered claystone in Subang Formation. Soil erodibility value in the research area ranged from 1,100 – 0,448 t ha h/ha MJ cm with dominance of low soil erodibility classes. The dominance of clay-sized soil causes low soil erodibility value because clay sized soil has cohesive properties so it tends to be difficult to erode.
Slope Stability Analysis of East Ring Road Construction at Sadawarna Dam With Shear Strength Reduction Method Putra, Rafino Kurnia; Zakaria, Zufialdi; Alfadli, Muhammad Kurniawan; Sophian, Raden Irvan; Khoirullah, Nur; Firmansyah, Yusi
Journal of Geological Sciences and Applied Geology Vol 7, No 3 (2023): 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.v7i3.50589

Abstract

Slope stability has been a problem that studied on geotechnical works for the uncertainties such as varieties of soil behaviours to unpredicted failure of measurements and samplings. The Limit Equilibrium Method (LEM) has been popular for decades for its convenience but cannot determine displacement thus the result could be uncertain. As computational calculations have been developed, the Finite Element Method (FEM) began to use as a tool to not only determine factor of safety, but also determine displacement and forces that affect slope’s stability. This research was done to analysed slope stability using Shear Strength Reduction (SSR) and compared it to general method such as Limit Equilibrium Method (LEM). The research was conducted on a section in Sadawarna DAM ring road area, Subang, West Java. Slope on research area was divided into two layers with the bottom layer relatively non-cohesive compared to the top of layer. Both soil however dominantly consist with fine grain soil such as silt and clay. The upper layer of slope can contain more water with liquid limit of 73,46% compared to the lower layer with 68,27% liquid limit.  Simulation result showed slope that analysed using SSR method has Factor of Safety (FoS) 0,12 lower than LEM method. SSR method could be used to analysed pessimistic value at worst scenario and could predicted deformation of slope.
Determining of Coefficient Correlation between UCS and PLI data for Various Rock Types at Batu Hijau Mine PT Amman Mineral Nusa Tenggara Adriansyah, Yan; Zakaria, Zufialdi; Muslim, Dicky; Hutabarat, Johanes
Journal of Geological Sciences and Applied Geology Vol 2, No 1 (2017): 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.v2i1.13418

Abstract

AbstractThe Batu Hijau Mine is one of the biggest gold-copper producer in Indonesia which operated by PT Amman Mineral Nusa Tenggara (PTAMNT). The mine site is located in the southwest corner of Sumbawa Island in the Sunda-Banda Archipelago in Indonesia. Based on the tectonic plate perspective, the Sumbawa Island lies along the tectonically active rock sequences.Refers to the geological model from comprehensive study starting from the exploration up to exploitation stages, there are four rock types that formed the slope at Batu Hijau Mine, namely volcanic rock, diorite, tonalite and young tonalite. The volcanic rock as a host rock is the most dominant material among the other rocks type which expose on the north-west, west and south wall.This study was focused on determining of the index conversion factor of the relation between uniaxial compressive strength (UCS) and point load test (PLT) data which obtained from the laboratory test result. The correlation factor for predicting UCS value from the PLT data for each rock type has shown the good correlation with the average of regression value is 0.88.  Keywords : Batu Hijau, Uniaxial Compressive Strength, Point Load Test, Conversion Factor. 
Co-Authors abdullah, Fajar Abu Abdillah Ali, Abu Abdillah Adiwijaya, Annisa Ayungingtyas Pratiwi Adriansyah, Yan Agung Mulyo Alam, Boy Yoseph Cahya Sunan Sakti Syah Alpionisa, Salsabila Nur Andriani, Tati APRILIAN, YOGA Arie Afriadi Asykarulloh, Abdul Wahid Aton Patonah, Aton Bakhtiar, Taufiq Basuki, Jodi Prakoso Bustomi, Zhafran Muhammad Asyam Chaniago, Aulia Eka P S Chen, Reynara Davin Dicky Muslim Emi Sukiyah Ersyari, Jodistriawan Firmansyah, M. Nizar Hendarmawan Hendarmawan, Hendarmawan Heriwaseso, Anjar Irvan Sophian Irvan Sophian, Irvan Ismawan Ismawan, Ismawan Iyan Haryanto, Iyan Jakah, Jakah Johanes Hutabarat Khoirullah, Nur Kristiawan, Yohandi Luthfan H. Jihadi, Luthfan H. Luthfan Harisan Jihadi, Luthfan Harisan MANIK, VITO ARISTO Mubarak, Aziez Muhammad Bey Anural, Muhammad Bey Muhammad Kurniawan Alfadli Mursito, Anggoro Nana Sulaksana NINGRUM, WIWIN JUNITA Oscar, Agus Wiramsya Pajrin, Ulfia Sari Pradnya Paramarta Raditya Rendra Putra, Rafino Kurnia Putri, Revena Denia Raden Irvan Sophian, Raden Irvan Rahmi, Nisa Shafira Muthia Ramsof, Rani Amalia Retnoningtyas, Widya Ika Rizky Narendra Utomo, Rizky Narendra Rukmana, Yanwar Yusup Sabila, Zahra Syahida Seraphine, Nadhirah Seru, Imanuel Shafira, Nisa Siahaan, Yakub Sidarto Sidarto Sihotang, Josua Washington Sulastri, Murni Sumarnadi, Eko Sumaryono Sumaryono Taufiq, Mochamad Muslim Ulhaque, Thaha Rizal Wicaksana, Kintan Adelia Arum Wicaksono, Danny Wiguna, Purwa Yogi Prianda, Yogi Yohanes Tan, Yohanes Yuda, Himmes Fitra Yusi Firmansyah, Yusi Yusuf, Muhammad Farhan