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All Journal IJOG : Indonesian Journal on Geoscience Journal of Engineering and Technological Sciences Jurnal Teknik Sipil Journal of Science and Applicative Technology Jurnal GEOSAPTA Jurnal Ilmiah Geologi pangea Journal of Engineering and Technological Sciences
Lilik Eko Widodo
Earth Resources Exploration Research Group, Faculty Of Mining And Petroleum Eng., Bandung Institute Of Technology, Jalan Ganesha 10, Bandung 40132,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering

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Estimating Groundwater Inflow to The Underground Mine Works using a 3D Groundwater Model at Vein Kubang Cicau, UBPE Pongkor Naiborhu, Kory Yohana Adinda; Anggayana, Komang; Widodo, Lilik Eko; Wibowo, Aryo Prawoto
Indonesian Journal on Geoscience Vol. 11 No. 3 (2024)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.11.3.423-435

Abstract

Estimating groundwater inflow to underground mines is essential for ensuring that mining activities can be conducted safely and continuously. Research conducted at UBPE Pongkor indicates that the veins have the fault connectivity with the Kubang Cicau vein showing potential for deeper mining, while other veins are expected to become exhausted. As the result, the Kubang Cicau vein will likely be at a lower elevation in the future. Planning decisions regarding groundwater control measures, such as dewatering, can be made in advance, contributing to a more efficient assessment of the economic feasibility of mining development. Groundwater modeling using MODFLOW software predicted a maximum groundwater discharge of 55 L/s. To address the model uncertainty, a sensitivity analysis was performed by increasing the hydraulic conductivity parameter by two order of magnitude, as this value significantly affects groundwater inflow. Conversely, decreasing the hydraulic conductivity by two order resulted in a new discharge estimate of 87 L/s. In the worst-case scenario, with the highest specific storage values, the inflow increased to 76 L/s. This demonstrates that although changes in specific storage have a notable effect on groundwater inflows, the impact is less pronounced compared to the changes in hydraulic conductivity. Nonetheless, Ss remains a key parameter, particularly in transient simulations where storage plays a more significant role in the system response to changes in water levels.
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.
Fault Surface Rupture Modeling Using Particle Image Velocimetry Analysis of Analog Sandbox Model Furqan, Terry Alfa; Sapiie, Benyamin; Natawidjaja, Danny Hilman; Widodo, Lilik Eko; Rudyawan, Alfend; Hadiana, Meli
Journal of Engineering and Technological Sciences Vol. 56 No. 1 (2024)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2024.56.1.10

Abstract

This study investigated the correlation between fault kinematics, surficial displacement, and surface rupture geometry patterns between earthquake cycles using particle image velocimetry (PIV) analysis of an analogue sandbox modeling that mimics InSAR observations. The research explored various fault systems, including reverse, normal, and strike-slip faults, through controlled sandbox experiments. The fault surface rupture zone manifests itself due to strain accumulation between two mobile blocks. The displacement magnitude is most pronounced on the surface and is absorbed by the section above the hanging wall or moving block. During fault surface rupture formation, the leading edge of the surface movement consistently extends beyond the anticipated fault surface rupture zone and retreats upon full fault surface rupture development. Subsequently, the distribution of the surface movement is sharply confined by the established fault surface rupture. The key findings of this study underscore the potential of PIV of sandbox modeling for studying fault surface rupture geometry and its development, providing insight into seismic processes. Overall, this work contributes to advancing our knowledge of seismic phenomena and improving strategies for earthquake prediction and mitigation.
Co-Authors Absari, Hirundini Rustica Annisa Annisa Benyamin Sapiie Cahyadi, Tedy Agung Danny Hilman Natawidjaja Eman Widijanto Eman Widijanto Faadhilah, Iftikhor Furqan, Terry Alfa Gunawan Handayani Handayani, Gunawan Iftikhor Faadhilah Imam Achmad Sadisun Irwan Iskandar Komang Anggayana Lambok M. Hutasoit Lambok M. Hutasoit Meli Hadiana Mudrik R. Daryono Mudrik R. Daryono, Mudrik R. Mulyono Dwiantoro Naiborhu, Kory Yohana Adinda Notosiswoyo, Sudarto Pamungkas, Tri Chandra Rahmat Fadhilah Reza Adhi Fajar Rudyawan, Alfend Sudarto Notosiswoyo Sudarto Notosiswoyo Sunyoto, Wahyu Toddy Syaifullah Toddy Syaifullah, Toddy Tri Chandra Pamungkas Wahyu Sunyoto Wibowo, Aryo Prawoto Widijanto, Eman Zuher Syihab