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All Journal Bulletin of Scientific Contribution : Geology Buletin Sumber Daya Geologi Journal of Geosciences and Applied Geology
Irvan Sophian, Irvan
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science

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Desain Lereng Final Dengan Metode Rmr, Smr Dan Analisis Kestabilan Lereng: Pada Tambang Batubara Terbuka, Di Kabupaten Tanah Laut, Provinsi Kalimantan Selatan Swana, Galih W.; Muslim, Dicky; Sophian, Irvan
Buletin Sumber Daya Geologi Vol 7, No 2 (2012): Buletin Sumber Daya Geologi
Publisher : Buletin Sumber Daya Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (8865.776 KB)

Abstract

Dalam menentukan kemiringan desain final lereng yang dibentuk, salah satu caranya ialah dengan menggunakan metode geomekanik melalui penentuan nilai Rock Mass Rating(RMR) dan nilai Slope Mass Rating (SMR). Namun, dari nilai SMR tidak diketahui faktor keamanan dari lereng tersebut sehingga diperlukan analisis kestabilan lereng. Nilai kemiringan lereng dan faktor keamanannya dapat menjadi acuan untuk membuat desain lereng final yang representatif. Penelitian dilakukan di tambang terbuka yang terdapat di Kecamatan Jorong Kabupaten Tanah Laut, Provinsi Kalimantan Selatan. Daerah penelitian terletak pada Formasi Warukin dengan unit stratigrafinya yaitu batupasir (pasir kasar - halus), mudstone dan carbonaceous mudstone, serta batubara dengan jurus N 80°– 90° E dan kemiringan 29°-35°. RMR pada section Sidewall berkisar antara 25- 59, dan SMR berkisar antara 30,1°– 59°; pada section Western Lowwall atau data bor AGT-02 dan AGT-03 berkisar antara 20 - 55 dan SMR berkisar antara 20°– 55°. Pada section Western Highwall RMR berkisar antara 34 -71 dan SMR berkisar antara 33,06° – 71°. Pada section Eastern Lowwall RMR berkisar antara 20-55 dan SMR berkisar antara 20° – 54,96°. Pada section Eastern Highwall RMR berkisar antara 29-79 dan SMR berkisar antara 29°–52°. Dari hasil analisis kestabilan lereng, pada umumnya nilai kemiringan lereng hasil dari nilai SMR berada pada kondisi labil sampai stabil sehingga perlu dilakukan penurunan muka air tanah pada beberapa bagian agar dihasilkan desain final lereng yang stabil.
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 : Buletin Sumber Daya Geologi

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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 
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.
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.
Morphometry And Morphotectonic Characteristics Of The Cisokan Watershed Segments Cilengkong And Cisukarama, West Java, Indonesia Saprana, Rifqi Dwi; Sophian, Irvan; Khoirullah, Nur; Ismawan, Ismawan
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.v5i1.34667

Abstract

West Java has a complex geological structure characteristic due to subduction events in the south of Java Island. The control of the geological structure affects the formation of the surrounding landscape, so analysis is needed to assess its activities. The research was conducted in the Cisokan sub-watershed in the Cilengkong and Cisukarama segments in Cianjur and West Bandung districts, West Java. The purpose of this study was to determine the morphometric and morphotectonic characteristics of the Cisokan watershed in the Cilengkong and Cisukarama segments. The method used is studio analysis using applications to process digital image data into morphometric and morphotectonic analysis parameters. The parameters analyzed were the bifurcation ratio, drainage density, basin shape index, drainage basin asymmetry, and mountain front sinuosity. The results obtained are that the Cilengkong segment has an Rb value of 4 - 4.5 with a medium flow density, a BS value of 1.80, an AF value of 25.8, and an SMF value of 1.19 - 2.78. The Cisukarama 1 segment has an Rb value of 4 - 4.25, a BS value of 1.62, an AF value of 57.14, and an SMF value of 1.66 - 3.41. The Cisukarama 2 segment has a value of Rb 3 - 4.25, a BS value of 1.59, an AF value of 42.5, and an SMF value of 1.34 and 2.13. The conclusion obtained is that tectonic activity as a landscape-forming factor in the study area decreases or even stops.
Determination of Maximum Unsupported Span and Stand Up Time Value using Q-System Method (Case Study: Pongkor Area, Nanggung Subdistrict, Bogor District, West Java Province) Alisah, Alisah; Sophian, Irvan; Zakaria, Zufialdy; Pratama, Ryan; Firmansyah, Yusi
Journal of Geological Sciences and Applied Geology Vol 2, No 4 (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.v4i2.18235

Abstract

Epithermal deposit might be a potential economic mining source. One kind of this deposit is the low-sulphidation epithermal with the quartz vein which can be found in the study area. However, the high intensity number of the alteration process will affect the rock mass quality in the area of interest which also will influence the safety of underground mining process, ecspecially while the tunnel reinforcement is being set. Therefore, maximum unsupported span and stand up time value need to be determined.Study area is Nanggung Subdistrict, Bogor District, West Java Province. This study is conducted at some fronts in Ciguha tunnel, using the Q system methode. After the rock mass has been classified, the maximum unsupported span and stand up time value can be calculated.The result shows that maximum unsupported span value has a variety number from 8 hours to 1 year extend. At the other side, stand up time value also has a variety number from 1 to 4 meters span. Both shows a value depends on their own rock mass quality. Keyword: Q- System, Stand up time, Maximum unsupported span
KERAPATAN KELURUSAN SUNGAI DI WILAYAH MAJALENGKA DAN HUBUNGANNYA DENGAN VARIABEL MEKANIKA TANAH: SUDUT GESER-DALAM Zakaria, Zufialdi; Sophian, Irvan
Bulletin of Scientific Contribution Vol 13, No 2 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (434.029 KB) | DOI: 10.24198/bsc.v13i2.8394

Abstract

Areas of the research include the role in The Eastern Zone of Bogor Basin. In this research are Research areas included in the Eastern zone Bogor Basin. In this research are discussed: 1) The role of tectonic and drainage lineament on Tertiary and Quaternary rocks in the study area; 2) The role of soil variables that are part of the parent rock material. The method used is a probabilistic analysis involving friction angle and lineament densty. The results showed: 1) The absence of differences in the direction of linemament drainage patterns on Tertiary and Quaternary rocks, indicating the influence of the deformation of the same, namely the upligt, the two rocks together to experience the rapture; 2) The density llinemanet associated with one variable, namely internal friction angle (phi). Internal friction angle (phi) decreases with increasing density lineament.
PERBANDINGAN SOIL IMPROVEMENT PADA TANAH LAPUKAN BATUAN VULKANIK DI JATINANGOR, KABUPATEN SUMEDANG, DAN TANAH LAPUKAN BATUAN VULKANIK DI CIGINTUNG, MALAUSMA, KABUPATEN MAJALENGKA Zakaria, Zufialdi; Sophian, Irvan; Chaniago, Aulia Eka P S
Bulletin of Scientific Contribution Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (342.966 KB) | DOI: 10.24198/bsc.v15i3.15097

Abstract

ABSTRACTSoil improvement is one of the methods of soil reinforcement. One method of soil improvement is the addition of soil with lime (CaO). The swelling soil (expanding when wet conditions, and shrinking when dry conditions) is identified from the value of soil activity. The behavior of soil activity decreases with increasing CaO, but for soils in weathered volcanic areas (volcanic breccia and lava) as in Jatinangor, with the value of high soil activity, the optimum addition of CaO to the soil is 15% and not more than 20%. Excessive addition of CaO tends to change the behavior of soil activity and increase the rate of activity. In the soil from weathered volcanic rock (tuff) as in Cigintung Village, District Malausma, in Majalengka, with the value of moderate to high soil activity, the addition of CaO is 15% to 20%. More than 20% CaO, activity number (A) decreases, but cohesion (c, Kg/M2) will decrease too, so the strength of soil will decrease.  Keywords: swelling, activity number, soil improvement,  ABSTRAKPerbaikan tanah (soil improvement) adalah salah satu metode perkuatan tanah. Salah satu metode soil improvement adalah penambahan tanah dengan kapur (CaO). Tanah yang bersifat swelling (mengembang bila basah dan mengerut bila kering) diidentifikasi dari nilai aktivitas tanahnya. Perilaku aktivitas tanah berkurang dengan bertambahnya  CaO. Untuk tanah di daerah lapukan vulkanik (breksi vulkanik dan lava) seperti di Jatinangor, dengan nilai aktivitas tinggi, penambahan CaO yang optimum pada tanah mengembang adalah 15 % dan tidak lebih dari 20 %. Penambahan CaO yang berlebihan cenderung mengubah perilaku aktivitas tanah dan meningkatkan kembali angka aktivitas. Pada tanah lapukan batuan vulkanik (tuff) seperti di desa Cigintung, Kecamatan Malausma, di Kabupaten Majalengka, dengan aktivitas tanah sedang sampai tinggi, penambahan CaO cukup 15% sampai 20%. Lebih dari 20% CaO, maka angka aktivitas turun, namun kohesi akan turun pula sehingga kekuatan tanah justru akan berkurang. Kata kunci: swelling, angka aktivitas, perbaikan tanah
GEOLOGI TEKNIK JATINANGOR: STUDI DAYADUKUNG TANAH BERDASARKAN PREDIKSI KADAR AIRTANAH UNTUK MENUNJANG ECO-CAMPUSS DI JATINANGOR Sophian, Irvan; Zakaria, Zufialdi; Prianda, Yogi; Utomo, Rizky Narendra
Bulletin of Scientific Contribution Vol 12, No 1 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v12i1.8360

Abstract

Research location at Rector Building area, Unpad Campus, Jatinangor. The study is a part of research of Jatinangor engineering geology. Strength prediction of soil bearing capacity for shallow foundation is performed by measuring the water content of the soil at four locations sampled. Based on the formula of Hirnawan & Zakaria (1991), a variable value of unit weight (γ)  = 1.73 T/M3; cohesion (c ) = 7.80 T/M2; and angle of friction= 13.69 degrees. The soil variables based on the value of water content by 43.85%. The result of soil bearing capacity (in dry conditions) around the ground surface of the rector building area is as follows: Type of foundations Square = 17,732 T/M2; Circular foundation type = 17,708 T/M2; Continuous foundation type = 13.714 T/M2. In wet conditions, the value of carrying capacity must be calculated again.
Desain Lereng Final Dengan Metode Rmr, Smr Dan Analisis Kestabilan Lereng: Pada Tambang Batubara Terbuka, Di Kabupaten Tanah Laut, Provinsi Kalimantan Selatan Swana, Galih W.; Muslim, Dicky; Sophian, Irvan
Buletin Sumber Daya Geologi Vol 7 No 2 (2012): 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.v7i2.106

Abstract

Dalam menentukan kemiringan desain final lereng yang dibentuk, salah satu caranya ialah dengan menggunakan metode geomekanik melalui penentuan nilai Rock Mass Rating(RMR) dan nilai Slope Mass Rating (SMR). Namun, dari nilai SMR tidak diketahui faktor keamanan dari lereng tersebut sehingga diperlukan analisis kestabilan lereng. Nilai kemiringan lereng dan faktor keamanannya dapat menjadi acuan untuk membuat desain lereng final yang representatif. Penelitian dilakukan di tambang terbuka yang terdapat di Kecamatan Jorong Kabupaten Tanah Laut, Provinsi Kalimantan Selatan. Daerah penelitian terletak pada Formasi Warukin dengan unit stratigrafinya yaitu batupasir (pasir kasar - halus), mudstone dan carbonaceous mudstone, serta batubara dengan jurus N 80°– 90° E dan kemiringan 29°-35°. RMR pada section Sidewall berkisar antara 25- 59, dan SMR berkisar antara 30,1°– 59°; pada section Western Lowwall atau data bor AGT-02 dan AGT-03 berkisar antara 20 - 55 dan SMR berkisar antara 20°– 55°. Pada section Western Highwall RMR berkisar antara 34 -71 dan SMR berkisar antara 33,06° – 71°. Pada section Eastern Lowwall RMR berkisar antara 20-55 dan SMR berkisar antara 20° – 54,96°. Pada section Eastern Highwall RMR berkisar antara 29-79 dan SMR berkisar antara 29°–52°. Dari hasil analisis kestabilan lereng, pada umumnya nilai kemiringan lereng hasil dari nilai SMR berada pada kondisi labil sampai stabil sehingga perlu dilakukan penurunan muka air tanah pada beberapa bagian agar dihasilkan desain final lereng yang stabil.
Co-Authors Adiwijaya, Annisa Ayungingtyas Pratiwi Agung Mulyo Alisah, Alisah Arma, Yadvi Arma, Yadvi Chaniago, Aulia Eka P S Dicky Muslim Ismawan Ismawan, Ismawan Khoirullah, Nur Khoirullah, Nur Rizky Narendra Utomo, Rizky Narendra Ryan Pratama Saprana, Rifqi Dwi Swana, Galih W. Swana, Galih W. Yogi Prianda, Yogi Yohanes Tan, Yohanes Yusi Firmansyah, Yusi Zakaria, Zufialdy Zufialdi Zakaria, Zufialdi