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Revia Oktaviani
Fakultas Teknik Universitas Mulawarman
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Finite Element Analysis of Strength Degradation and Interface Behavior Controlling Bund Wall Stability in an Ex-Mining Pit Oktaviani, Revia; Trides, Tommy; Pontus, Albertus Juvensius; Tanjung, Afdal Jamil; Haviluddin, Haviluddin
International Journal of Engineering, Science and Information Technology Vol 6, No 1 (2026)
Publisher : Malikussaleh University, Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52088/ijesty.v6i1.1786

Abstract

This study presents a finite element analysis of the stability and interface behavior of a bund wall constructed under tropical mining conditions at the Banda Mine, East Kalimantan, Indonesia. The research aims to evaluate the effects of strength degradation and geometric interfaces on the overall stability of the embankment system, which was designed to retain overburden material and mitigate slope failure under combined rainfall and seismic loading. The bund wall, with an overall height of 75 m and a base width of 130 m, was constructed using compacted sandy loam sourced from site overburden. Laboratory testing determined the geotechnical parameters of the materials, including soft clay, sandy loam, and siltstone foundation. Finite element modeling was performed on six critical cross sections to simulate progressive strength reduction representing 0%, 25%, and 50% cohesion loss. The calculated factors of safety ranged from 1.87 to 2.55 along the slope, 3.40 to 5.81 at the bund wall base, and 7.79 to 10.27 within the foundation, confirming overall structural stability under all modeled scenarios. However, local reductions in stability were observed near the interface zones and the central section of the wall at depths exceeding 25 m. These findings highlight the influence of interface geometry and strength degradation on stability performance and emphasize the need for improved compaction and continuous stress monitoring during operation
Penentuan kedalaman zona degradasi pada lereng highwall di PT putra karya borneo Natasya Amanda Putri; Tommy Trides; Revia Oktaviani; Albertus Juvensius Pontus; Rety Winonazada
Journal Transformation of Mandalika, e-ISSN: 2745-5882, p-ISSN: 2962-2956 Vol. 7 No. 5 (2026): Mei
Publisher : Institut Penelitian dan Pengembangan Mandalika Indonesia (IP2MI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/jtm.v7i5.6331

Abstract

lope stability in open-pit mining is a critical aspect influenced by the geotechnical conditions of slope-forming materials, particularly the presence of a degradation zone. This study aims to determine the depth of the degradation zone or Fully Disturbed Limit (FDL) and to analyze its role in the stability of the highwall slope at Pit North, PT Karya Putra Borneo. The research employs a quantitative approach using secondary data, including slope geometry and geotechnical parameters, combined with slope modeling using Slide 6.0 software. The depth of the degradation zone is determined based on a disturbance factor (D) value of 0.7, representing mechanical excavation methods. The results indicate that the degradation zone extends to a depth of approximately 3.9 meters from the slope surface, forming a relatively weaker layer compared to the underlying material. This zone has the potential to act as a weak plane that controls slope failure mechanisms. Therefore, the depth and position of the degradation zone are key factors that must be considered in slope stability analysis to support safer and more effective slope design in open-pit mining.
Permodelan hidrogeologi kondisi natural pada daerah luyo kabupaten polewali mandar provinsi sulawesi barat Nur Aqsa Syahban Irwan; Shalaho Dina Devy; Albertus Juvensius Pontus; Revia Oktaviani; Agus Winarno
Journal Scientific of Mandalika (JSM) e-ISSN 2745-5955 | p-ISSN 2809-0543 Vol. 7 No. 5 (2026)
Publisher : Institut Penelitian dan Pengembangan Mandalika Indonesia (IP2MI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/10.36312/vol7iss5pp741-752

Abstract

The Luyo area, Polewali Mandar Regency, West Sulawesi Province, has a high dependence on groundwater as the main source of water for domestic and community activities. Increasing groundwater utilization may potentially disturb the natural hydrogeological balance if it is not properly managed. Therefore, a comprehensive understanding of natural hydrogeological conditions is essential as a basis for sustainable groundwater management. This study aims to determine the hydrogeological conditions of the study area, the natural groundwater balance, and the groundwater flow pattern and hydraulic head distribution through natural-condition hydrogeological modeling. The research methods include hydrological analysis, groundwater level measurements, electrical resistivity surveys using the Schlumberger configuration, pumping tests, and steady-state numerical groundwater modeling based on conceptual and mathematical approaches. The results indicate that the hydrogeological system in the study area consists of unconfined and semi-confined aquifers controlled by local lithological and geomorphological conditions. The natural groundwater balance shows that the study area remains in a relatively balanced condition, with groundwater recharge primarily derived from rainfall infiltration. Groundwater flow generally follows the topography, moving from recharge areas toward discharge zones such as rivers and springs. Model calibration results show good agreement between simulated and observed hydraulic heads. The developed natural-condition hydrogeological model is expected to serve as a baseline reference for evaluating future changes in the groundwater system due to human activities and environmental changes
Rekomendasi perencanaan sistem penyaliran pada disposal selatan PT victor dua tiga mega Putri Lufian Tika; Agus Winarno; Ardhan Ismail; Shalaho Dina Devy; Revia Oktaviani
Journal Scientific of Mandalika (JSM) e-ISSN 2745-5955 | p-ISSN 2809-0543 Vol. 7 No. 6 (2026): (in progress)
Publisher : Institut Penelitian dan Pengembangan Mandalika Indonesia (IP2MI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/10.36312/vol7iss6pp827-836

Abstract

This study aims to analyze the effectiveness of drainage in the southern disposal pit dump 4 area. It uses a descriptive quantitative method with primary data collection in the form of actual channel conditions and dimensions, as well as flow velocity measurements using the float method. Secondary data includes rainfall data, disposal design, topography, and mine progress maps. The analysis uses the Mononobe method to calculate rainfall intensity, the rational method based on a 10-year return period to calculate planned runoff discharge, and the Manning equation to determine channel capacity. The results of this study indicate that the actual open channel in the disposal area of pit dump 4 south has a discharge of 0.50 m3/s under light rain conditions and a discharge of 1.12 m3/s under heavy rain conditions, and experiences a decrease in hydraulic performance due to erosion on the channel walls and sediment deposition at the bottom of the channel. Therefore, the current channel cannot accommodate and drain the maximum discharge that may occur under extreme conditions. It is recommended that an open channel with a channel capacity of 8.45 m3/s can accommodate a planned runoff discharge of 7.68 m3/s, which indicates that the drainage system is capable of accommodating and draining water safely, efficiently, and sustainably
Co-Authors Abdul Malik Achmad Faisal Achmad Jefry Yandus Agus Winarno Agus Winarno Agus Winarno, Agus Ainayah Al Fatihah Albertus J Pontus Albertus Juvensius Pontus Albertus Juvensius Pontus Anakta Hartanta sebayang Ananda, Dea Mierela Ardhan Ismail Ardhan Ismail Arif Setiawan Ashabul Kahfi, Ashabul Azzahra, Siti Maghfirah Benny Christian BB Bryan Andreas Turnip Budi Utama, Yogi D. Devy, Shalaho Daruis, Rabin Deni Saldi Dina Devi, Shalaho Dina Devy, Shalaho Dionisyus Fransiskus Sinaga Fernando Lawangan Ginting, Emdananta Gunawan Manullang, Ronal Edi Harjuni Harjuni Hasan Harjuni Hasan Haviluddin Haviluddin Henny Magdalena Ilham, Akbar Irvan Erika Pangestu Irvantoni Simbolon, Desron Jaba, Yafet Joe Vandame Juvensius Pontus , Albertus Juvensius Pontus, Albert Juvensius Pontus, Albertus Juvensius Pontusi, Albertus Juvensius, Albertus Kasbillah, Kasbillah Ketut Swarningsih Kevin Elzar Rosera A Kresna Phadiakara Krisanto Yardin Panggeso L. Tobing, Ciko Gratio Parkletos Lifia Kemala Dewi Litha Respati, Lucia Lucia Litha Respati Lucia Litha Respati Lucia Litha Respati Lucia Litha Respati M. Rijal, M. Mardan Ali Masayu Widiastuti Milda Milda Muhammad Hamzah, Muhammad Muhammad Rayhan Fhadillah Mukmin, Abdul Rijal Musodiq Musodiq Natasya Amanda Putri Nimsi, Yekeskiel Nugroho, Windhu Nur Aqsa Syahban Irwan Nur Qorima Azis Nur, Al Maida Nurhidayat, Royan Pontus, Albertus Juvensius Putri Lufian Tika Rafael Bonardy Gultom Respati, Lucia Litha Rety Winonazada Ronald Alvin Ifnie, Jones S. Depari, Raja Kami Sandri Tandi Rapang Satria Bekti, Nanda sebayang, Anakta Hartanta Sembiring, Irianta Ibo Shalaho Dina Devy Shalizam, Shalizam Sharon Tria Kurniawati Silaban Silalahi, Abdi Brema Sitepu, Joe Vandame Situmorang, Ardo P Sokisha, Sokkia Suhaila Ridwan Suharni Suharni Tanjung, Afdal Jamil Tommy Trides Tommy Trides Tommy Trides Tommy Trides Tommy Trides Tommy Trides Tommy Trides Trides, Tommy Vandrianus Felix Feto Nuwa W. S. Gumilang, W. S. Gumilang Wahyu Garini, Andini Dwi Widiastuti, Masayu Widzar, Moh. Widzar Fahmi Windhu Nugrho windhu Nugroho Windhu Nugroho Windhu Nugroho windhu Winonazada, Rety Yekeskiel Nimsi Yufita, Zaenul