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All Journal Jurnal Ilmiah MTG Jurnal RISET Geologi dan Pertambangan Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir Journal of Geoscience, Engineering, Environment, and Technology JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Eksakta : Berkala Ilmiah Bidang MIPA JURNAL TEKNIK HIDRAULIK KURVATEK Ophiolite : Jurnal Geologi Terapan Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil JURNAL TEKNIK GEOLOGI : Jurnal Ilmu Pengetahuan dan Teknologi Indonesian Geotechnical Journal Jurnal Ilmiah Geologi pangea Bulletin of Geology Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Imam Achmad Sadisun
Fakultas Ilmu Dan Teknologi Kebumian, Institut Teknologi Bandung
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation

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KLASIFIKASI MASSA BATUAN RMI (ROCK MASS INDEX) UNTUK ANALISIS KESTABILAN LERENG DENGAN METODE ELEMEN HINGGA Hasan Tri Atmojo, S.T., M.T.; Imam Achmad Sadisun
Jurnal Ilmiah MTG Vol 13, No 2 (2022): Jurnal Ilmiah MTG Volume 13 No. 2, Desember 2022
Publisher : Jurusan Teknik Geologi Fakultas Teknologi Mineral UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmtg.v13i3.9397

Abstract

ABSTRAK - Pada penelitian ini akan digunakan studi klasifikasi massa batuan terhadap lereng alami, yaitu klasifikasi RMi dengan objek penelitian pada lokasi lereng batuan yang berada di Cipatat, Kabupaten Bandung Barat, Provinsi Jawa Barat. Lokasi penelitian memiliki morfologi bentuk lereng terjal dengan litologi dominan berupa batugamping. Klasifikasi RMi ini jarang digunakan karena memiliki beberapa parameter yang cukup rumit untuk dilakukan pembobotan. Untuk mendapatkan nilai bobot dari klasifikasi massa batuan dilakukan pengamatan lapangan dengan scanline dan pengambilan sampel batuan utuh. Hasil properti keteknikan dari klasifikasi massa batuan RMi dianalisis menggunakan metode elemen hingga (finite element method). Massa batuan di lokasi penelitian memiliki litologi dominan berupa batugamping kalkarenit, kalsirudit, dan kalsilutit dengan tingkat pelapukan rendah hingga sedang. Bobot massa batuan berdasarkan klasifikasi RMi berkisar 2,09 – 6,228 (high). Properti keteknikan dari massa batuan dari lima lokasi memiliki modulus deformasi (Em) berkisar 3.068 – 11.550 MPa, kohesi (c) berkisar 0.236 – 2.334 MPa, sudut geser dalam (ɸ) 37o – 57o, dan kuat tarik (σt) berkisar 0,04 – 0.80 MPa. Dari hasil analisis tersebut, properti keteknikan dari klasifikasi massa batuan RMi dapat diterapkan untuk analisis kestabilan lereng menggunakan metode elemen hingga. Rekomendasi penyangga dari klasifikasi RMi cukup signifikan berpengaruh pada faktor keamanan dan perpindahan kestabilan lereng. Kata kunci: Klasifikasi massa batuan RMi, kestabilan lereng, volume blok, metode elemen hingga ABSTRACT - In this research, a rock mass classification study on rock slopes will be used, the RMi classification with the research object on rock slope locations in Cipatat, West Bandung Regency, West Java Province. The research location has a steep slope morphology with dominant lithology in the form of limestone. The RMi classification is rarely used because it has several parameters that are quite complicated to weight. To obtain weight values from rock mass classification, field observations were carried out with a scanline and intact rock samples were taken. The results of the engineering properties of the RMi rock mass classification were analyzed using the finite element method. The rock mass at the study site has dominant lithology in the form of calcarenite, calcirudite, and calcilutite limestones with low to moderate weathering levels. The rock mass weight based on the RMi classification ranges from 2.09 to 6.228 (high). The engineering properties of the rock masses from five locations have a deformation modulus (Em) ranging from 3,068 – 11,550 MPa, cohesion (c) ranging from 0,236 – 2,334 MPa, internal friction angle (ɸ) 37o – 57o, and tensile strength (σt) ranging from 0,04 – 0.80 MPa. From the results of this analysis, the engineering properties of the RMi rock mass classification can be applied to slope stability analysis using the finite element method. Support recommendations from RMi classifications have quite an effect on the safety factor and slope stability, while another recommendation to make the slope more stable is to make a cut-off slope for each slope so that the slope is more stable.
Laboratory Study of Grouting Method to Improve Loose Sand Against Liquefaction Cindarto; Paulus Pramono Rahardjo; Imam Achmad Sadisun
Indonesian Geotechnical Journal Vol. 2 No. 2 (2023): Vol.2 , No.2, Agustus 2023
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v2i2.68

Abstract

Liquefaction is a phenomenon when soil behaves like liquid during earthquake, and only occurs in saturated loose fine sand with grain size ranging from 0.2 to 0.02 mm. Liquefaction can be devastating, causing failure and deformation to buildings, roads, and bridges. Thus, research study on the application of grouting method for improving liquefiable fine sand in the laboratory is carried out. Grouting is a soil improvement method that injects cementing agent into a soil mass. After the grout has solidified, the soil density and consistency of the soil will improve. This research proves, mathematically and experimentally, that grouting can improve the density and consistency of liquefiable sand, thus reducing the liquefaction potential. Grouting liquefiable saturated sand basically compacts the soil, leading to consolidation as soil pore-water is dissipated during the grouting process. It is found that the volume of grout per unit volume of soil mass treated is directly proportional with the reduction of void ratio and increase in soil density.
The Safety Assessment of Chemical Grouting “Sodium Silicate-based” in Indonesian Soils Rizky Satria Putranto; Hideki Shimada; Imam Achmad Sadisun; Masyhur Irsyam; Sugeng Wahyudi; Tomohiko Abe
Indonesian Geotechnical Journal Vol. 2 No. 3 (2023): Vol. 2, No. 3, December 2023
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v2i3.66

Abstract

Chemical grouting is a method to improve or accelerate the solidification process on a loose soil. The implementation of improper chemical grouting may lead to affect the safety level of groundwater; thus, the technical ability and safety should be analyzed comprehensively to prevent degenerative effect on environment. Volcanic soil is targeted on this research coherent to the abundancy in Indonesia. In this study, a field scale test was conducted to validate leaching test results that were obtained in the lab and to confirm the safety of sodium silicate-based chemical grouting. In addition, the geoelectric survey was conducted to ensure the flowing of groundwater by observing resistivity of soil layer. On laboratory test result, the significance basic pH was observed, in consequence some test revealed an increase in concentration of heavy metals. The bench test was conducted in Jatinangor area’s soil as a representative of Indonesian soil to validate the laboratory result. During the bench test, the pH of ground water was monitored continuously for 5 months, where a slight increase in the pH values of ground water was observed. In addition to that, water samples were collected and analyzed in the laboratory to examine heavy metal contamination in ground water on the 18th day after the chemical grouting injection was started. However, the increased concentration was not found which indicates the pH control shall be the main control of metal leaching. As the conclusion, pH monitoring as early measurement for chemical grouting effect on groundwater is proposed to be set as standard for chemical grouting work.
KARAKTERISTIK GEOTEKNIK MINERAL LEMPUNG PADA TEROWONGAN TAMBANG BAWAH TANAH CIURUG LEVEL 600, PONGKOR, JAWA BARAT Robby Ginanjar; Imam Achmad Sadisun
Bulletin of Geology Vol 3 No 1 (2019): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2019.3.1.6

Abstract

Zona argilik pada terowongan tambang bawah tanah Ciurug level 600 memerlukan penanganan dan perhatian khusus pada perkuatan terowongan. Hal ini perlu dilakukan karena zona argilik tersebut secara umum membuat massa batuan disekitar penambangan menjadi lemah. Zona argilik tersebut dapat diidentifikasi secara langsung pada bukaan terowongan atau dari hasil inti pemboran bawah permukaan. Argilitisasi yang terjadi pada bukaan XC 662 dan XC 6-1a memiliki karakteristik yang berbeda, baik secara persebarannya maupun jenis kehadiran mineral lempungnya. Zona argilik yang hadir pada bukaan XC 662 menunjukan distribusi yang terkonsentrasi di sekitar urat kuarsa, sedangkan pada bukaan XC 6-1a distribusinya lebih merata, sehingga melemahkan hampir di seluruh bagian bukaan terowongan. Karakteristik mineral lempung pada zona argilik di kedua bukaan terowongan diuji menggunakan beberapa pengujian salah satunya adalah uji batas Atterberg. Hasil uji batas Atterberg menunjukan bahwa Indeks Plastisitas (IP) dari mineral lempung pada zona argilik berkisar antara 17,64 – 33,33 dan nilai aktivitas yang berkisar antara 1,1 – 1,6. Nilai tersebut dipengaruhi oleh mineral lempung berupa kaolinit, vermiculite, smektit, dan halloysite. Kata kunci: Zona argilik, karakteristik, batas Atterberg, nilai aktivitas
ANALISIS KETAHANAN (DURABILITY) BATULEMPUNG FORMASI SUBANG DI DAERAH UJUNGJAYA DAN SEKITARNYA, KABUPATEN SUMEDANG, JAWA BARAT Misbahudin Misbahudin; Imam Achmad Sadisun
Bulletin of Geology Vol 2 No 1 (2018): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2018.2.1.3

Abstract

Saat ini pembangunan skala besar sedang direncanakan di sekitar wilayah Sumedang, Jawa Barat yang meliputi pembangunan Bandara Internasional Kertajati, Jalan Tol Cisumdawu, Sentra Industri Ujungjaya, dan Bendungan Cipanas. Aktivitas pembangunan tersebut dapat terkendala permasalahan geologi teknik karena berada di atas batulempung Formasi Subang. Batulempung jenis ini diketahui memiliki pengaruh signifikan dalam aktivitas rekayasa karena sifatnya yang mudah hancur (slaking) ketika mengalami kontak dengan udara dan/ atau air. Tujuan dari penelitian ini adalah untuk mengetahui karakteristik ketahanan (durability) batulempung Formasi Subang di Daerah Ujungjaya, Kabupaten Sumedang. Penelitian dilakukan melalui observasi lapangan dan pengambilan sampel batulempung segar dalam bentuk sampel tak terganggu. Selanjutnya sampel dibawa ke laboratorium dan dilakukan pengujian slake durability serta analisis mineral lempung melalui uji difraksi sinar X. Dari hasil pengujian tersebut, batulempung Formasi Subang di daerah penelitian memiliki ketahanan rendah. Kandungan mineral monmorilonit dan pirit yang ditemukan pada sampel batulempung Formasi Subang menjadi faktor penyebab rendahnya nilai ketahanan batuan tersebut.
Karakterisasi Tanah Vulkanik di Kabupaten Kediri, Jawa Timur, Indonesia Berdasarkan Uji CPT, SPT, dan PMT: Site Characterization of Volcanic Soil in Kediri Regency, East Java, Indonesia Based On CPT, SPT, and PMT Wiwarsono, Fransisko; Rahardjo, Paulus Pramono; Sadisun, Imam Achmad
Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil Vol. 12 No. 2 (2023): Cantilever
Publisher : Department of Civil Engineering and Planning, Faculty of Engineering, Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35139/cantilever.v12i2.205

Abstract

Indonesia is a country surrounded by the Pacific Ring of Fire so that various areas are dominated by volcanic soil. Volcanic soils have unique and unusual characteristics, different structures and properties from soil in general, and are strongly influenced by geological processes. Volcanic soils were also found to be problematic and caused a lot of geotechnical damage. Research on volcanic soils from a geotechnical perspective in Indonesia is still very limited. This study aims to characterize volcanic materials in Kediri Regency, East Java, Indonesia, based on in situ testing using CPT (Cone Penetration Test), Standard Penetration Test (SPT), and Pressuremeter Test (PMT). CPT and SPT are the most common and frequently used field tests, while PMT is used to obtain horizontal stresses. Some data from the X-Ray Diffraction Analysis (XRD) test and corebox drilling results will also be used in this study. Field test results will display soil classification and parameters, which will then be combined, and empirical correlations will be obtained for site characterization as well as comparisons with other volcanic soil literature studies. The results showed that the volcanic soil in Kediri Regency consists of non-lateritic to lateritic soil. Based on the CPT and SPT correlations, it was found that the qc/N value was greater than in general soils for both cohesive and non-cohesive soils. The authors also found a relationship between parameters and interpretation of PMT data against NSPT for cohesive volcanic soils in the study area.
Simulasi Respon Airtanah terhadap Kegiatan Dewatering pada Lokasi Penggalian Stasiun Bawah Tanah MRT A dan B di Kota Jakarta Pusat Absari, Hirundini Rustica; Widodo, Lilik Eko; Sadisun, Imam Achmad
Jurnal Ilmiah Geologi PANGEA Vol 11, No 1 (2024): Jurnal Ilmiah Geologi Pangea
Publisher : PROGRAM STUDI TEKNIK GEOLOGI FAKULTAS TEKNOLOGI MINERAL UPN VETERAN YOGYAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jigp.v11i1.12703

Abstract

Kegiatan penggalian dan dewatering yang dilakukan di kawasan perkotaan menghadapi tantangan akibat keberadaan airtanah. Airtanah yang tidak dikontrol dapat mengganggu kestabilan bangunan-bangunan bersejarah dan penting yang berada di sekitar lokasi penggalian. Lokasi kegiatan penggalian dan dewatering berada di Kota Jakarta Pusat, Provinsi DKI Jakarta, yang dilakukan untuk konstruksi dua stasiun bawah tanah MRT yang berjarak 800 m. Lokasi ini berada di Cekungan Airtanah Jakarta dengan litologi penyusun berupa endapan kipas aluvium dengan material butir berukuran lempung hingga pasir sendang berumur Kuarter. Kegiatan dewatering dilakukan dengan menggunakan sumur pelepasan tekanan (pressure relief well) sebanyak 46 sumur di Stasiun Bawah Tanah A dan 29 sumur di Stasiun Bawah Tanah B dengan kapasitas 4,15 m³/s per sumur . Simulasi airtanah dilakukan menggunakan Softwater Visual Modflow dengan metode numerik beda hingga berdasarkan beberapa asumsi untuk menyederhanakan pembuatan model airtanah. Pemantauan respon airtanah dilakukan dengan pengamatan terhadap perubahan head dan drawdown selama 1186 hari. Pada lokasi Stasiun Bawah Tanah A, terjadi penurunan head (drawdown) sebesar 3,1 m, sedangkan pada Stasiun Bawah Tanah B terjadi drawdown sebesar 5,5 m. Pengaruh dewatering dapat terlihat hingga jarak 550 m dengan drawdown sebesar 1- 8 cm.
Segmentation of the Active Fault on the Cirebon-Semarang Segments as Revealed by DEM-Derived Geomorphic Indices Jannah, Miftahul; Pamumpuni, Astyka; Sadisun, Imam Achmad
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 04 (2024): JGEET Vol 09 No 04 : December (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.04.15572

Abstract

This research focuses on the segmentation and tectonic activity of the Baribis-Kendeng Fault across the Cirebon to Semarang segments, revealed through the analysis of geomorphic indices derived from Digital Elevation Models (DEM). Utilizing geomorphic indices such as the Hypsometric Integral (HI), Stream Length-Gradient Index (SL), and SL/K ratio, the analysis was conducted on 33 streams crossing ten segments. The results indicate that the landscape in the research area is predominantly in the youthful stage, with HI values ranging from 0.459 to 0.492, indicating active tectonic uplift. Segments such as Ungaran and Pemalang exhibit significant tectonic activity, with high SL/K values, particularly in the Ungaran segment, where the SL/K value reaches 344.872. These findings suggest that fault activity in the region is ongoing, with stronger uplift patterns observed at the western and eastern ends of the fault, while relatively lower activity is found in the central area. This research highlights the ongoin tectonic processes shaping the region’s geomorphology and contributes to a better understanding of the active fault system in Java Island.
GEOMORFOLOGI SESAR AKTIF DI PULAU RUMBERPON, PAPUA Pamumpuni, Astyka; Sapiie, Benyamin; Ipranta, Ipranta; Sadisun, Imam Achmad
Bulletin of Geology Vol 6 No 1 (2022): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2022.6.1.4

Abstract

Morfologi di bagian Leher Burung, Papua didominasi oleh bentuk morfologi sesar naik dan lipatan. Morfologi yang menunjukkan lipatan ideal yang masih muda, bentukan antiform merepresentasikan antiklin. Namun demikian, data kegempaan di daerah Leher Burung, Papua menunjukkan banyaknya gempa dengan mekanisme sesar normal dan sesar mendatar.Observasi geomorfologi di lokasi Leher Burung, di Pulau Rumberpon dilakukan pada studi ini dengan menggunakan data DEM (digital elevation model) dengan resolusi 8m dari DEMNAS (digital elevation modelnasional). Analisis geomorfologi ditekankan pada identifikasi sesar aktif. Data kegempaan yang berupa lokasi gempa (epicenter dan hipocenter), magnitudo, dan waktu kejadian didapatkan dari katalog kegempaan yang telah direlokasi. Mekanisme fokal gempa didapatkan dari katalog CMT (centroid moment tensor). Data kegempaan digunakan untuk melihat hubungan data kegempaan dan hasil analisis geomorfologi.Hasil analisis geomorfologi menunjukkan adanya sesar normal yang aktif berkorelasi dengan arah jurus dari mekanisme fokal yang ada di area ini. Observasi menunjukkan adanya bukti-bukti sesar normal dengan arah jurus utara-selatan (N-S) dan timur laut-barat daya (NE-SW). Fitur-fitur geomorfologi yang terpetakan antara lain adalah laguna yang memanjang, lembah paralel, penampang topografi yang menunjukkan seri rangkaian sesar normal, gawir sesar, dan relay-ramp. Fitur geomorfologi yang ada menunjukkan adanya seri sesar normal aktif memiliki kemiringan ke barat dengan jurus ke utara-selatan sesuai dengan arah jurus dari mekanisme fokal kegempaan yang ada. Kesesuaian antara mekanisme fokal gempa dan bukti morfologi menunjukkan adanya sesar normal aktif di area Leher Burung, terutama di Pulau Rumberpon. Mekanisme pembentukan sesar di Pulau Rumberpon ini terkait erat dengan Sesar Yapen-Sorong dan adanya pembelokan ke kanan zona sesar tersebut. Kata kunci: geomorfologi, sesar normal, Papua, sesar aktif
LIQUEFACTION POTENTIAL ANALYSIS IN TRANS-SULAWESI RAILWAY, POLEWALI MANDAR-MAJENE SEGMENT USING CONE PENETRATION TEST METHOD Zhafira, Dzikra; Sadisun, Imam Achmad
Bulletin of Geology Vol 6 No 2 (2022): Bulletin of Geology Special Issue: International Seminar on Earth Sciences and Te
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2022.6.2.8

Abstract

Trans-Sulawesi Railway is the first railway in Sulawesi. One of the segments that is passed by this railway is Polewali Mandar-Majene segment, West Sulawesi. The research focused on this segment and mostly contains of Quaternary sediments such as alluvial. Liquefaction may occur because of earthquake that causes loss of strength within soils. Most of the cases, liquefaction occur in Quaternary sediments that are decomposed, loose, and unconsolidated. So, liquefaction analysis is needed on the research area to determine the liquefaction potential that might happen there. Liquefaction potential analysis was carried out using Cone Penetration Test method (CPT). The analysis was carried out by calculating liquefaction safety factor (FSL) and liquefaction potential index (LPI) at 14 CPT sites with varying depth from 3.8 meters – 14 meters. Based on the analysis, the liquefaction safety factor (FSL) value shown that the 14 CPT sites has a potential for liquefaction with Mw 7.5 earthquake because the FSL values are less than 1. Based on the calculation of LPI, the research area is in the high – highest category. Keywords: Cone Penetration Test (CPT), Polewali Mandar, liquefaction, Liquefaction Potential Index (LPI)
Co-Authors Absari, Hirundini Rustica Adrin Tohari Atin Nur Aulia Benyamin Sapiie Cindarto Danang Setiya Raharja Dasapta Erwin Irawan, Dasapta Erwin Dwi Sarah Firdaus El Afghani Hasan Tri Atmojo, S.T., M.T. Heri Syaeful Heri Syaeful Herlambang Fredomeseliano, Bonanza Hideki Shimada I Wayan Sengara Indra Andra Dinata Ipranta Ipranta, Ipranta Kartiko, Rendy Dwi Kurniawan Lilik Eko Widodo Masri Masri Masyhur Irsyam Miftahul Jannah Misbahudin . Misbahudin Misbahudin Misbahudin Misbahudin Moch Hilmi Zaenal Putra Moch Hilmi Zaenal Putra Muhammad Iqbal Hamidi Muhammad Iqbal Hamidi Naufal, Muhammad Adi Nurwijayanti Pamumpuni, Astyka Paulus Pramono Rahardjo Prihadi Soemantidiredja Rendi Dwi Kartiko Rifki Asrul Sani Rizky Satria Putranto Robby Ginanjar Salim, Muhammad Abdul Rahman Septiandi, Muhammad Iqbal Sucipta Sucipta Sucipta Sucipta Sugeng Wahyudi Sukristiyanti Sukristiyanti Tedy Cahya Nusantara Tomohiko Abe Wiwarsono, Fransisko Zhafira, Dzikra