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All Journal SIKLUS: Jurnal Teknik Sipil Journal of the Civil Engineering Forum Makara Journal of Technology Indonesian Geotechnical Journal Jurnal Teknik Sipil
Wijaya, Martin
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Analysis of Chloride Contaminant Transport in Tailings Storage Facility Dam (Case Study: Gold Mine in Sumatra) Pascayulinda, Devina; Widjaja, Budijanto; Wijaya, Martin
Journal of the Civil Engineering Forum Vol. 10 No. 2 (May 2024)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.9520

Abstract

In the practice of gold mining industry, hazardous waste known as tailings is produced during the ore extraction process. These tailings are typically stored in a dam structure called a Tailings Storage Facility (TSF). The planning and construction of a TSF are critical considerations, as the failure of a TSF can have substantial environmental impacts, pose risks to human safety, and result in industrial losses. Therefore, strict control is necessary in the development of TSFs to minimize the potential negative consequences. This research focuses on the transport of contaminants within a TSF, specifically examining the concentration of chloride contaminants and conducting particle movement analysis. The study utilizes modeling through the GeoStudio SEEP/W program to simulate groundwater flow profiles and the GeoStudio CTRAN/W program to understand contaminant movement over a 100-year period. GeoStudio modeling employs 10 materials: impermeable clay soil, filter sandy soil, transition gravel rock, three mine waste types (Fine, Rockfill, and Rockfill with fine), hard rock bedrock layer, in-situ soil representing the original layer, landslide with colluvial soil, and the tailings itself. Back analysis is employed to iterate model parameters and ensure modeling accuracy against field data, including comparisons with water quality test results and readings from vibrating wire piezometer (VWP) instrumentation. The contaminant transport is influenced by advection-dispersion processes and tends to concentrate within the TSF boundary toward the dam toe over a 100-year timeframe. The analysis emphasizes the influence of advection in contaminant transport and underscores the importance of particle position relative to the groundwater level, with Particle Tracking Analysis shows significant movement within the groundwater flow area. This research provides crucial insights into the dynamics of contaminant concentration, informing better decision-making in TSF planning and management. The findings underscore the imperative of strict control measures to minimize environmental impacts and human safety risks associated with TSFs, thereby advancing knowledge in gold mining waste management.
Excess Pore Pressure Migration Analysis Due to High Embankment Construction – Case Study East Kalimantan Lie, Edwin; Rahardjo, Paulus Pramono; Wijaya, Martin
Journal of the Civil Engineering Forum Vol. 10 No. 2 (May 2024)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.9713

Abstract

A 42-inch pipeline traverses a predominantly flat right-of-way (ROW), running from south to north in East Kalimantan. Adjacent to the ROW, a coal mine concession was located on the western side, while the Mahakam River lies a further 3 km to the east. A mining waste dump has been constructed since 2010, situated in an area underlain by soft alluvium soil (Qa). The waste was stacked, reaching heights of up to 75 meters, with its toe approximately 200 m from the edge of the ROW. In 2016, a failure occurred in the ROW, causing the 42-inch pipeline to shift a maximum of 6.8 m horizontally, and rise by 2.0 m within a 300 m span. A geotechnical investigation was then conducted, consisting of 7 CPTu with dissipation testing. The CPTu results indicated high pore pressure, with a layer of soft clay ranging from 15 to 32 m thickness found in the ROW area. A hypothesis was formulated suggesting that the soft clay was not fully consolidated. Hence, the failure of the pipeline was possibly caused by the migration of excess pore water pressure accumulated during the construction of the waste dump. Results of the investigation indicated that the permeability coefficient was 2.5 times greater in the horizontal direction compared to the vertical ones (kh/kv = 2.5), allowing the pore water pressure to migrate more easily in the horizontal direction. This study aims to elucidate how the migration of excess pore water pressure in the horizontal direction influences ground stability. The analysis was conducted using finite element software MIDAS GTS NX, with the kh/kv varying from 2.5 to 100 times to explore excess pore pressure movement behaviors. The results of this study confirm that excess pore pressure migration can occur horizontally if the horizontal permeability coefficient is larger than its vertical counterpart. Thus, this study highlights that the greater the permeability coefficient and the larger the ratio, the further the excess pore pressure travels. Moreover, the horizontal displacement increases with the permeability coefficient ratio.
Dampak Model Tanah Pada Analisis Metode Elemen Hingga 2 Dimensi Terowongan NATM : Studi Kasus Terowongan Manikin Hanif, Muhammad; Lim, Aswin; Wijaya, Martin; Prassetyo, Simon Heru
Siklus : Jurnal Teknik Sipil Vol. 9 No. 2 (2023): Siklus: Jurnal Teknik Sipil
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Lancang Kuning

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31849/siklus.v9i2.15936

Abstract

Konstruksi terowongan melalui tanah lempung sensitif terhadap air dapat menyebabkan deformasi berlebihan pada dinding terowongan. Untuk dapat memprediksi deformasi yang terjadi pada terowongan melalui tanah lempung ekspansif, model konstitutif tanah yang sesuai dibutuhkan agar pemodelan memberikan hasil analisis yang memuaskan. Makalah ini berisi mengenai fenomena swelling tanah pada Terowongan Manikin di Kupang. Analisis deformasi terowongan menggunakan metode elemen hingga 2D dengan bantuan program Plaxis2D dilakukan untuk memberi prediksi terhadap deformasi yang terjadi pada terowongan Manikin. Analisis dilakukan menggunakan dua model konstitutif tanah, model keruntuhan Mohr-Coulomb dan Hardening Soil. Penggunaan kedua model tersebut dilakukan untuk mengetahui dampak serta pengaruh dari kedua model konstitutif tanah terhadap nilai deformasi pada terowongan melalui tanah ekspansif. Untuk dapat memodelkan fenomena swelling pada tanah, dikerahkan beban tambahan pada dinding terowongan yang berperan sebagai tekanan swelling pressure. Dengan metode ini, analisis menggunakan simulasi numerik dapat menyerupai deformasi dari hasil pengawasan di lapangan. Hasil simulasi numerik menunjukan bahwa desain sistem penyangga asli menggunakan model MC dan HS memberikan deformasi sebesar 921,5 mm (11,8%) dan 900 mm (11,5%). Dua alternatif sistem penyangga awal diusulkan, menggunakan steel ribs dengan profil lebih besar dan Umbrella Arch Method (UAM). Kedua alternatif secara signifikan memberikan hasil deformasi yang lebih kecil dari desain awal. Steel ribs yang lebih besar memberikan deformasi terkecil menggunakan model MC sebesar 412 mm (5,2%), sedangkan UAM memberikan deformasi terkecil pada model HS dengan deformasi sebesar 247 mm (3,1%).
Spatial Variability of Sliding Plane on Volcanic Region. Case Study of Sta 21+200 Cisumdawu Toll Road Arsyad, Ahmad Kemal; Wijaya, Martin; Johan, Albert; Pramono Rahardjo, Paulus
Indonesian Geotechnical Journal Vol. 3 No. 2 (2024): Vol. 3, No. 2, August 2024
Publisher : Himpunan Ahli Teknik Tanah Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56144/igj.v3i2.69

Abstract

Landslide can be caused either by natural phenomenon or due to human intervention. Regardless of the triggering factor, once landslide occurs, sliding plane in the form of discontinuity or sometimes referred as sliding plane is formed. Identifying the location and geometry of the sliding plane is important in determining the location of the reinforcement to rehabilitate slope failure. However, it is often difficult to locate the location and geometry of the sliding plane as the sliding direction is also difficult to ascertain. In this paper, slope failure which occurred in STA 21+200 of Cisumdawu toll road is used as case study. Variability of the sliding planes are investigated based on the location of the concrete overbreak that occurred during the bored pile construction on Tuff (volcanic soils) in Sumedang Region. Sliding planes are also estimated based on the soil investigation and pile boring records. The proposed solution is to reinforce the bored piles that did not penetrate into the hard layer with ground anchors installed at the pile cap.
Perbandingan Profil Penurunan Muka Air untuk Akuifer Tidak Terkekang Menggunakan 3D Modflow Studi Kasus Pantai Indah Kapuk Susanto, Amalia; Widjaja, Budijanto; Wijaya, Martin
Jurnal Teknik Sipil Vol 21 No 2 (2025): Jurnal Teknik Sipil
Publisher : Universitas Kristen Maranatha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28932/jts.v21i2.9647

Abstract

Dewatering is required to control the flow of groundwater and to lower the position of the groundwater table during excavation. In planning the dewatering system, parameters related to the flow of water in the soil are required. One of these is the conductivity value, which can be obtained from pumping tests. The sand layer found on the ground surface, which is saturated of water, is referred to as an unconfined aquifer. In this study, conductivity analysis of unconfined aquifer was conducted in PIK2 area using 3 conventional methods which are, Thiem (1906) method and curve matching method of Boulton (1963) and Neuman (1972). Conductivity values obtained from conventional calculations are then analyzed using the help of a program based on the 3D finite difference method Modflow to obtain a pattern of groundwater level decline or can also be called a depression cone. In sandy soil in the PIK2 reclamation area, conductivity values of 5.90×10-5 m/s to 8.08×10-5 m/s were obtained Neuman's method can produce better conductivity values in unconfined aquifers, as shown by the results of the water table profile from the 3D Modflow analysis.
Determination of Excess Pore Pressure in Under Consolidating Soil by using CPTu Ihut, Karolina Villa Delfia; Wijaya, Martin; Lim, Aswin; Satyanaga, Alfrendo; Aglia, Grisella; Syifanaya, Sharfina Faradiba; Sugianto, Andy
Makara Journal of Technology Vol. 29, No. 2
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

North Jakarta is predominantly composed of soft soil that is still undergoing consolidation. According to research by Raharjo et al. (2022), excess pore pressure is still present in the soils of Jakarta. The degree of consolidation and excess pore pressure values indicate that consolidation is not yet complete (Raharjo et al., 2022). In this study, the researchers developed two methods to determine excess pore pressure using field testing. The Stress History and Normalized Soil Engineering Properties (SHANSEP) model equation from Ladd and Foot (1974), as well as Finite Element Method (FEM) modeling using the PLAXIS program, were utilized to estimate the excess pore pressure in the soil. The results from the SHANSEP-based analysis were then compared with those from the FEM analysis using PLAXIS. The comparison showed that the excess pore pressure estimated using PLAXIS closely matched the values obtained from CPTu tests based on the SHANSEP model. Interpretation of parameters from the Cone Penetration Test with pore pressure measurement (CPTu) indicates that the soil at the project site is still consolidating and undergoing settlement. Similarly, the settlement results from the PLAXIS analysis support this conclusion.
Co-Authors Aglia, Grisella Alfrendo Satyanaga Andy Sugianto Arsyad, Ahmad Kemal Aswin Lim Budijanto Widjaja Ihut, Karolina Villa Delfia Johan, Albert Lie, Edwin Muhammad Hanif Pascayulinda, Devina Paulus Pramono Rahardjo Pramono Rahardjo, Paulus Prassetyo, Simon Heru Susanto, Amalia Syifanaya, Sharfina Faradiba