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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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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.
Brief Communication: Rapid Assessment of landslide events based on UAV photogrametry: The 9 January 2021 Cimanggung Landslide, Sumedang, Indonesia Abdurrahman, Ali; Budipraja, Muhammad Ariq; Khoirullah, Nur; Helmi, Faisal; Sophian, Raden Irvan
Journal of Geological Sciences and Applied Geology Vol 4, 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.v4i2.32063

Abstract

The landslide incident in Cisarua Village, Cimanggung District on January 9, 2021, is one of the natural disasters which is quite concerning to see the victims. This short mapping is focused on seeing changes in the shape of the affected area and slope faces before the landslide and after the incident. The brief mapping uses the DJI Mavic Pro model UAV that flies at an altitude of 50 meters and 150 meters above the ground with an overlap of 80% and covers an area of 3 ha. Aerial photo processing will produce output in the form of orthophoto images and digital elevation models (DEM) of landslide affected areas. The result of geometric observation showed that the land surface was covered with an area of 3,789 m2. The measured flat length ranges from 120 meters and 32 meters wide. There is also a slope angle after and before the landslide of 2.8 degrees. Analysis of the causes of landslides in terms of geomorphological aspects shows the landslide affected areas that are right in the hilly valleys coupled with buildings that cover the surface water flow from high rainfall. In addition, the analysis of the causes of technical geological analysis shows that landslides can occur due to differences in soil types with different physical properties so that the two soils are not bound by cohesion forces between soils.
SETTLEMENT IN THE NOTHERN PART OF BEKASI REGENCY, WEST JAVA PROVINCE, BASED ON CONE PENETRATION TEST DATA Jatsiah, Siti Nadia; Ismawan, Ismawan; Khoirullah, Nur; Pramudyo, Tulus
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.v7i2.49996

Abstract

In the nothern part of Bekasi Regency, the soil layers are dominated with alluvial deposit, especially clay and silt deposit. It makes the potential of the settlement in this area is getting higher. In this research, Cone Penetration Test (CPT) have been done to determine the soil layers from the surface till the 20 meters depth and to identify other soil properties, such as unit weight, compression index, swelling index, void ratio, etc. This research aims to analyze the total settlement in the northern part of Bekasi Regency based on CPT data. The total settlement is calculated by using the theory of One-Dimensional Primary Consolidation based on CPT data. The research area shows that the highest result of total settlement calculation is in the northern part of research area which directly adjacent to the Java Sea. It can be happened because the clay layers in northern part is way thicker than the other area.
GEOPLANOLOGY MODELING IN THE PLANNING AREA OF MAJALENGKA, WEST JAVA Nurohim, Dede; Princessca, Channia; Khoirullah, Nur; Sulaksana, Nana; Waliana, Teuku Yan
Journal of Geological Sciences and Applied Geology Vol 2, No 6 (2018): 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.v2i6.20871

Abstract

Based on the geological condition, the study area consisted of carbonate sandstone units (Tmbp), claystone units (Tml), non-carbonate sandstone units (Tpbp), andesitic intrusions (Ia), volcanic breccia units (Qbv), and alluvium (Qal) units. The different types of constituent rocks will affect the innate characteristics or properties of the rock. The regional genetic units explain kinship relations between lithology, morphology, and tectonics. It is used to determine the genetic processes that occur in an area which will later be developed into the smallest units in the geological analysis. In terms of spatial planning, the geological analysis is needed to produce an ideal area in terms of water adequacy, environmental carrying capacity, and disaster. In accordance with Law No. 11 of 2011 concerning the district development plan of Majalengka, then a layout plan emerged that would be applied to the area. Especially in the research area, land suitability covers a possible area that has a value of> 131, spread in the north to the west of the research area, with high to the very high land capability to be developed. The constrained area which has a value of 121-131 is spread in the north to south of the research area, with the ability of the land to be developed. And the limitation area has a value of <121 dominating in the northwest to the southeast of the research area, with low land capacity - very low to be developed. Based on the analysis, there are still some areas that are not in accordance with the pattern of development which should be mainly the development of protected areas.
SOIL SLOPE REINFORCEMENT USING CANTILEVER RETAINING WALL ON THE WEST RING ROAD OF SADAWARNA DAM, SUBANG DISTRICT Rizki, Afdal; Alam, Boy Yoseph Cahya Sunan Sakti Syah; Khoirullah, Nur; Sophian, Raden Irvan; 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.v7i3.50433

Abstract

The research was conducted in the West Ring Road of Sadawarna Dam, Subang Regency. This research aims to provide recommendations for the design of cantilever retaining wall to increase the value of the slope safety factor in the research area. Calculation of the value of the slope safety factor uses the limit equilibrium method with the Janbu calculation method. In actual conditions, the value of the slope safety factor shows an unstable value referring to SNI 8460:2017, namely in static conditions with a vehicle load is 1.31 and in pseudostatic conditions with a vehicle load is 1.083. Slope strengthening was carried out using cantilever retaining wall. The retaining wall design that has been made meets the criteria for stability against overturning, stability against sliding, and stability for the bearing capacity of the soil. The safety factor value for slope with retaining wall shows a stable FS value referring to SNI 8460:2017, namely 1.53 in static conditions with vehicle loads and 1.11 in pseudostatic conditions with vehicle loads. Keyword: slope, safety factor, retaining wall, cantilever
The Effect of Surface Water On The Slope Of “X” Housing Gunung Geulis, Cimanggung District, Sumedang Regency Putri, Revena Denia; Sophian, Raden Irvan; Zakaria, Zufialdi; Khoirullah, Nur
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.v5i2.34638

Abstract

Rainfall intensity can affect water infiltration to the ground. The increase in groundwater level will increase pore pressure (μ) that minimizes shear resistance of the slope mass, especially on the ground material (soil). The increase in surface water levels also increases surface water discharge and increases erosion below the surface (piping or subaqueous erosion). As a result of more subtle friction (silt) from the time that washed away soil, the soil will decrease future resilience. This happened in Subdistrict Cimanggung, Sumedang, West Java. This area is composed of weathered soil of volcanic products such as tuff, volcanic breccia, and andesitic lava. The parameters of this research contain basic properties and mechanical properties of soil, slope profile in MH soil, and water surface level. This research aims to determine basic properties and mechanical properties of soil, as well as the effects of groundwater level, that can give recommendations for groundwater level to get a stable condition of the slope. The basic properties and mechanical properties of soil are known based on laboratory tests from a disturbed and undisturbed soil sample were obtained by surface sampling and geotechnical hand drilling. Slopes were analyzed by the Bishop method using Rockscience Slide software. The result is there’s an increase in the value of safety factors when the level of surface water level decrease. From the value of the safety factor that varies between slope sections, that slope can be stable if water surface level -7,5 meters beneath the surface.
SOIL BEARING CAPACITY OF SHALLOW FOUNDATION BASED ON TERZAGHI METHOD IN CIPATAT, WEST BANDUNG, WEST JAVA Wicaksana, Kintan Adelia Arum; Zakaria, Zufialdi; Muslim, Dicky; Khoirullah, Nur
Journal of Geological Sciences and Applied Geology Vol 4, No 1 (2020): 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.v4i1.28998

Abstract

Infrastructure development is a common thing that happened in Indonesia, especially house construction that happened in Cipatat, West Bandung, West Java. One of the important things in construction is a foundation and one of the foundation’s types is a shallow foundation. Soil bearing capacity is one of several things that used to calculate foundation planning. This research is using the Terzaghi method for soil bearing capacity. The data was obtained by taking the disturbed sample from three different locations. Those samples were tested in a laboratory, the test is a direct shear test to know about soil bearing capacity's value. The result is soil bearing capacity value range between 5.47 ton/m2 - 26.52 ton/m2. That value for soil bearing capacity is categorized as low.
Analysis of Tectonic Control Using Order and Bifurcation Ratio Madani, Ghoffar Cahya; Sophian, Raden Irvan; Khoirullah, Nur
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.v5i1.34639

Abstract

Quantitative geomorphological can be analyzed using watersheds morphometric aspect. Morphometry can be interpreted as a quantitative aspect of watersheds or parameters of watershed characteristics that can be measured and calculated. This research was shown to determine the tectonic control of the research area with the approach of the morphometric aspect of watershed. Aspect of watershed morphometry used in this research consist of river order and bifurcation ratio (Rb), drainage density (Dd), asymmetry factor (Af), mountain front sinuosity (Smf) and watershed shape index (Bs). The method used in this research is the studio method by processing Digital Elevation Model data using Arcmap software. Based on the results obtained, there are 4 sub-watersheds in the research area that have different calculation values. Sub-Watershed 1 has an Af value is (66,025), Smf value is (1.43 – 4.56), and Bs value is (1,002). Sub-Watershed 2 has an Af value is (51,398), Smf value is (1.38 – 3), and Bs value is (0.907). Sub-Watershed 3 has an Af value is (49,536), Smf value is (1.17 – 2.91), and Bs value is (0.933). Sub-Watershed 4 has an Af value is (60,407), Smf value is (1.8 – 3), and Bs value is (1,486). Based on all the calculation results, the relative tectonic activity index (IATR) value is 3 which belongs to class 4 which indicates low tectonic activity in the research area. This is also supported by the calculation of the bifurcation ratio where only a small part of the river segment is affected tectonics, meaning most of the others are not active tectonically.
THE BANDUNG CITY SPATIAL PLANNING POLICIES IN GEOLOGICAL PERSPECTIVE Sukiyah, Emi; Khoirullah, Nur
Journal of Geological Sciences and Applied Geology Vol 4, No 1 (2020): 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.v4i1.29147

Abstract

The Bandung city has an advantageous position, both from geographical, geological, political, and strategic aspects. The location of Bandung city, which is in the highlands, is famous for its cool weather. Since the colonial era of the Dutch East Indies, Bandung City has been the center of government and research in the field of geology. One piece of evidence that is still well preserved is the Geology Museum. Even the impression of geology is still strong with the many government institutions in the field of geological development in this city. The aspect of natural resources, including geology, is also the main asset to organize the Bandung city. The volcanic products that underlie this city become a fertile land for agriculture and the mining industry for construction and industrial materials. Several rivers also flow in this area. The hilly panorama with the post-volcanism phenomenon is an attraction for developers in the tourism sector. The groundwater potential is also abundant. The development of Bandung City does not mean that there are no obstacles. The significant increase in population has earned this city the nickname of the most populous city in West Java. If the city government cannot control the increase in the population density, it is not impossible that this city will be a city that does not have the appeal again. In fact, now the impact is already being felt, traffic jams, floods, waste, etc. Bandung city spatial planning should be carried out in an integrated manner, involving historical, geological, geographic, socio-cultural, political, and strategic aspects.
Stratified Soil Characterization using 1D Resistivity Inversion along the Pasuruan Coastline, East Java Alam, Syaiful; Khoirullah, Nur; Rukmana, Yanwar Yusup
Journal of Geological Sciences and Applied Geology Vol 2, No 5 (2018): 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.v2i5.20248

Abstract

The inversion has been widely used in subsurface modeling of numerousdata. The number of stratified soil layer and thicknesswere driven by damped least-squares inversion method.This studyintegrated five borehole logs and six vertical electrical sounding measurements. The inversion result is able to predict an unsampled of borehole data. The resulting maximum rms error is 0.22 and minimum rms error is 0.011 from 1D inversion.The borehole datas indicatedgravelly soil layer, sandy soil layer,and clayey soil layer withthe resistivity values respectively range from 33.6-7.45 (Ohm.m), 7.45-3.98 (Ohm.m), and 3.98-0.016 (Ohm.m).Based on the studyresult there were possibilities of seawater intrusion indication according to the soil stratigraphic profile based on resistivity properties and borehole data. Keyword: Pasuruan coastline, stratified soil, 1D resistivity inversion.
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