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All Journal REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development
Ramadhani, S.
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Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Engineering Environmental Science Transportation

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Kajian Penerapan Fondasi Sumuran Pada Jembatan Pombeve di Kabupaten Sigi Sulawesi Tengah Padondan, G.J.; Ramadhani, S.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 1 Issue 2 (September 2020)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v1i2.31

Abstract

Analisis Stabilitas Lereng Tambang Nikel Kabupaten Morowali Ramadhani, S.; Minmahddun, A.; Patuti, I.M.; Widiastuti, M.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 5 Issue 1 (March 2024)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v5i1.654

Abstract

Central Sulawesi Province is a province that has quite high mining activities, so an evaluation of the stability of open pit slope excavations needs to be carried out to prevent collapses during the exploration process which could result in loss of life. Analysis using the finite element method is one method that can be used to analyze slope deformation and stability during the excavation process. This research simulates excavation of a mine slope in 4 stages with a height of 5 m and a slope of 500. The analysis was carried out based on the results of the N-SPT test at three locations (GT-15617, GT-19125 and GT-19841) which are the slopes with the most extreme slopes. The analysis results show that at GT-15617 the maximum deformation occurred at stage 4 of the excavation at 0.18 m with a safety factor of 1.43, the maximum deformation at the GT-19125 location occurred at stage 4 at 0.21 m with a safety factor of 1.26 and at location GT-19841 maximum deformation occurred at stage 4 of 0.21 with a safety factor of 1.21. The overall safety factor analysis results do not meet the required minimum safety factor criteria.
Karakteristik Kuat Geser Tanah Dengan Tanpa Akar Vegetasi Pada Lereng Ruas Tawaeli -Toboli Martini, M.; Sutapa, I.W.; Ramadhani, S.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 6 Issue 1 (March 2025)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v6i1.715

Abstract

The contribution of vegetation to slope stability is based on hydrological and mechanical aspects. The effect of vegetation on the hydrological aspect is to reduce soil water content through transpiration, interception and evapotranspiration. And the mechanical influence of vegetation is through strengthening the roots in the soil. Water absorption by vegetation varies depending on age and density, rainfall factors and soil type. Cohesion (c) and friction angle () are soil shear strength parameters. In soil that has vegetation roots, it will form a composite material, namely the root-soil model, there is an increase in cohesion value with the presence of roots, this is what is called apparent cohesion (c'R). Several parameters that are believed to influence the shear strength of the soil and roots will also be studied, namely the physical properties of the roots, namely diameter, type of root/vegetation, and water content. For mechanical properties, namely the tensile strength of the roots, the shear strength parameters of the soil both without and with roots, namely cohesion, apparent cohesion and internal friction angle. The type of vegetation reviewed in this research is elephant grass with fibrous roots. The results obtained indirectly by increasing the value of cohesion and angle of friction in the soil due to the presence of roots influence/increase the shear strength of the soil. The volume of roots in the soil greatly influences changes in the cohesion value or angle of friction of the soil. As the root volume decreases, the shear strength value decreases, the shear strength parameter also decreases. In this study, the change in soil shear strength values in sandy soil conditions, the increase in cohesion value was not as significant compared to the change in friction angle values.
Co-Authors Anafi Minmahddun I.M. Patuti Martini, M. Padondan, G.J. Sutapa, I.W. Widiastuti, M.