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All Journal JOURNAL ONLINE OF PHYSICS Petro : Jurnal Ilmiah Teknik Perminyakan Bulletin of Geology
Muhammad Zelandi
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Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Physics

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The Evaluation of Prefabricated Vertical Drain as the increasing of Consolidation Process in Residual Soil of Talanggulo Sanitary Landfill, Jambi Zelandi, Muhammad
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.2022.6.2.9

Abstract

Proses konsolidasi pada lapisan tanah residu yang belum terkonsolidasi primer dengan baik (tekanan pori 1 kN/m2) dapat meningkatkan potensi terjadinya penurunan tanah. Untuk mengatasi masalah tersebut perlu dilakukan percepatan proses konsolidasi primer lapisan sedimen, sehingga tanah dapat menahan beban yang ada di atasnya. Lahan urug saniter di Talanggulo, Jambi, berada pada tanah residu dengan kondisi litologi yang didominasi oleh lempung yang proses konsolidasinya berlangsung lebih lama. Oleh karena itu, perlu dilakukan percepatan penurunan tanah yang dapat dijadikan sebagai dasar penimbunan. Metode yang digunakan dalam penelitian ini adalah metode analitik dan metode elemen hingga, yaitu melihat penurunan vertikal tanah dan penurunan tekanan air pori (PWP) pada kondisi lahan urug saniter tanpa prefabricated vertical drain (PVD), dan dengan PVD pada jarak 2 m dan 3 m pada lapisan tanah residu. Berdasarkan hasil pengukuran pada saat tebal timbunan 15 m, terlihat bahwa pada kondisi tanpa PVD terjadi perubahan vertikal sebesar 1,75 m, sedangkan pada kondisi lahan urug saniter dengan PVD interval 3 m tercatat penurunan sebesar 2,02 m, TPA dengan PVD interval 2 m terdapat perubahan vertikal sebesar 2,12 m. Sedangkan proses PWP pada tanah tanpa PVD menunjukkan bahwa kecepatan agar mencapai tekanan pori minimum lebih cepat dibandingkan dengan kondisi tanpa PVD, dengan PVD interval 2 m lebih besar pengaruhnya dibandingkan PVD dengan jarak 3 m. Dapat diketahui penggunaan PVD di lahan urug saniter Talanggulo dapat efektif untuk mempercepat proses konsolidasi. Kata kunci: lahan urug saniter, prefabricated vertical drain, sedimen lempung, konsolidasi
EVALUASI BATUAN INDUK FORMASI TALANG AKAR ATAS BERDASARKAN DATA GEOKIMIA DI DESA BUKIT SUBAN, KABUPATEN SAROLANGUN, SUB-CEKUNGAN JAMBI Alfayed, Muhammad Rus Dody; Riyadi, Hasan; Zelandi, Muhammad; Siregar, Yusmansyah; Syaifudin, M.
Petro : Jurnal Ilmiah Teknik Perminyakan Vol. 14 No. 4 (2025): Desember 2025
Publisher : Jurusan Teknik Perminyakan Fakultas Teknologi Kebumian dan Energi Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/petro.v14i4.24537

Abstract

Our oil and gas exploration must be able to understand the concept of the petroleum system. Source rock is one of the most important parameters in the petroleum system that functions as a hydrocarbon producer or source rock, even placing the bedrock as the number one priority that must be present in the petroleum system (Magoon and Dow, 1994). This study aims to determine the potential of parent rocks in the Upper Talang Akar Formation in the research area to produce hydrocarbons. The research method was carried out using surface samples, geochemical analysis of Total Organic Carbon, Rock-Eval Pyrolysis and Vitrinite Reflektance. Based on the results of geochemical analysis research that has been carried out on the source rock of the Upper Talang Akar Formation, the characteristics of the potential of the source rock in producing hydrocarbons have a rich organic material range (1.38 – 4.06), based on TOC data, the sample of the source rock of the Upper Talang Akar Formation has quite good potential. Analysis of organic material types in the study area's source rock samples yielded kerogen types II and III that have the potential to produce oil and gas hydrocarbons. The maturity level analysis is based on Tmax data of the Upper Talang Akar Formation source rock has an immature maturity level and based on Ro data, the upper Talang Akar of the source rock has an immature maturity level. Therefore, it can be concluded that the shale source rock of the Upper Talang Akar Formation in the research area has the potential to produce good to very good hydrocarbons and produce oil and natural gas in the immature phase.
ELECTRICAL RESISTIVITY-BASED SUBSURFACE CHARACTERIZATION AND GEOTECHNICAL CORRELATION FOR LANDFILL SITE INVESTIGATION IN BULAKAN, CILEGON, BANTEN Zelandi, Muhammad; Tadersi, Risnaliyah Nuriil; Kirana, Febiyora Chandra; Siregar, Anggi Deliana; Ritonga, D.M. Magdalena
JOURNAL ONLINE OF PHYSICS Vol. 11 No. 3 (2026): JOP (Journal Online of Physics) Vol 11 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v11i3.55250

Abstract

Landfill infrastructure development requires comprehensive subsurface characterization to ensure foundation stability and long-term environmental safety. This study applies Electrical Resistivity Tomography (ERT) using the Wenner electrode configuration along five survey lines (400 m length, 10 m electrode spacing) as the primary characterization method, integrated with geotechnical borehole drilling, Standard Penetration Tests (SPT), and groundwater observations at four boreholes of 10–20 m depth, to evaluate the suitability of Bukit Bulakan, Cilegon, Banten Province for landfill development. Inversion of 2D resistivity sections identifies three principal lithological units: Clayey Sand (0–150 Ω·m, SPT-N 10–36), Silty Sand (150–200 Ω·m, SPT-N 22–50), and Sandstone (200–1,300 Ω·m, SPT-N >50). Resistivity-to-SPT-N correlation demonstrates a consistent positive relationship in which increasing resistivity corresponds to increasing lithological compaction. Weak zones (47–73 Ω·m) identified along three survey lines indicate fault or fracture features that represent potential leachate migration pathways. The Sandstone layer at depths exceeding 10–15 m constitutes the most suitable foundation for landfill construction, while weak zones require targeted mitigation, including geomembrane installation and periodic ERT monitoring. This study confirms that integrating ERT with conventional geotechnical investigation provides substantially more comprehensive spatial subsurface characterization than borehole-only approaches in heterogeneous volcanic geological environments.
COMPARATIVE EVALUATION OF LANDSAT 8 OLI AND SENTINEL-2A SPECTRAL RESPONSES AND THE APPLICATION OF SWIR BAND COMPOSITES FOR GEOLOGICAL LINEAMENT DELINEATION IN THE MOUNT LAWU VOLCANIC COMPLEX Riyadi, Hasan; Utama, Hari Wiki; Alfayed, Muhammad Rus Dody; Zelandi, Muhammad; Gingga, Flaminggo
JOURNAL ONLINE OF PHYSICS Vol. 11 No. 3 (2026): JOP (Journal Online of Physics) Vol 11 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v11i3.59266

Abstract

Geological mapping and structural lineament extraction in active volcanic terrains with rugged topography face major constraints due to dense vegetation cover and limited terrestrial accessibility. This study aims to evaluate and compare the spectral and spatial performance of multispectral remote sensing data for geological exploration through two main aspects comparative evaluation of the Normalized Difference Vegetation Index (NDVI) between Landsat 8 OLI (30 m) and Sentinel-2A (10 m), and application of Shortwave Infrared (SWIR) band composites of Landsat 8 OLI (Bands 5, 6, and 7) for automated structural lineament extraction. The methodology encompasses Top of Atmosphere (TOA) radiometric correction, NDVI transformation, RGB 5-6-7 composite processing, and automated lineament detection using the LINE algorithm in PCI Geomatica validated against DEM Hillshade. Results indicate that Sentinel-2A (10 m) excels in delineating micro-vegetation density and reducing mixed pixel effects in steep terrains. Conversely, Landsat 8 OLI is significantly superior and more efficient for regional geological exploration owing to its seamless single-scene coverage homogeneity and the heightened sensitivity of its SWIR channels (Bands 6 and 7) toward lithological texture variations beneath vegetation cover. The RGB 5-6-7 combination clearly highlights surface roughness contrasts (rough on structural hills and fine on alluvial plains) and successfully identifies 1,248 lineament segments with a dominant West–East (W – E) trend. This structural trend represents regional faulting and fracturing controlling the hydrothermal and hydrogeological systems of Mount Lawu.
Co-Authors Alfayed, Muhammad Rus Dody Gingga, Flaminggo Hari Wiki Utama Kirana, Febiyora Chandra M. Syaifudin Nuriil Tadersi, Risnaliyah Ritonga, Magdalena Riyadi, Hasan Siregar, Anggi Deliana Siregar, Yusmansyah