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All Journal AGREGAT Jurnal Teknika : Jurnal Teoritis dan Terapan Bidang Keteknikan
Alexsander, Stephanus
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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Evaluasi Stabilitas Lereng dan Strategi Mitigasi Longsor dengan Metode Bored Pile di Ruas Jalan Muara Teweh–Benangin STA 51+950, Kalimantan Tengah Alexsander, Stephanus; Sarie, Fatma; Ikhwan Yani, Mohammad; Nomeritae; Agustinus
AGREGAT Vol 10 No 1 (2025)
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/ag.v10i1.26048

Abstract

Pembangunan infrastruktur di Indonesia menghadapi tantangan signifikan terkait stabilitas lereng, terutama di daerah dengan topografi curam. Penelitian ini bertujuan untuk menganalisis stabilitas lereng pada Ruas Jalan Muara Teweh–Benangin STA 51+950, Kecamatan Teweh Timur, Kabupaten Barito Utara, Kalimantan Tengah, serta mengevaluasi efektivitas perkuatan bored pile dalam meningkatkan faktor keamanan (SF). Analisis dilakukan menggunakan metode elemen hingga (Finite Element Method) dengan perangkat lunak Plaxis 2D, berdasarkan data sekunder dari hasil pengujian lapangan dan laboratorium. Hasil analisis awal menunjukkan bahwa nilai SF kondisi eksisting adalah 1,833, yang mencerminkan kondisi aman secara teoretis. Namun, observasi di lapangan menunjukkan adanya longsoran, sehingga dilakukan back analysis yang menghasilkan nilai SF sebesar 1,034, mendekati kondisi kritis. Untuk mitigasi, dilakukan pemodelan perkuatan bored pile dengan diameter 0,5 meter dan panjang 7 meter. Hasil pemodelan menunjukkan peningkatan nilai SF menjadi 1,540, yang memenuhi ambang batas minimum stabilitas lereng sebesar 1,25.
IDENTIFIKASI POSISI CRACKS DAN PENGARUHNYA TERHADAP PERUBAHAN STABILITAS LERENG Jarkani, Jarkani; Alexsander, Stephanus; Sarie, Fatma; Yani, Mohammad Ikhwan; Hendri, Okrobianus
Jurnal Teknika: Jurnal Teoritis dan Terapan Bidang Keteknikan Vol. 9 No. 1 (2025): Jurnal Teknika: Jurnal Teoritis dan Terapan Bidang Keteknikan, Oktober 2025
Publisher : Fakultas Teknik Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36873/jt.v9i1.11232

Abstract

Slope is the difference in elevation of a land surface with a varying angle of inclination. Disasters that commonly occur on slopes are landslides caused by the loss of stability on a slope. One of the determinants of slope stability is the strength of the material that makes up the slope to resist collapse. Generally, slope stability analysis only refers to the values of cohesion (c) and soil shear angle (ø), without taking into account the weak plane on the slope. Landslides that occur on slopes generally occur partially. Partial landslides are caused by the presence of weak areas on the slope. The process of identifying weak areas in the slope uses the geoelectric method. The use of geo-electrical methods through field surveys in the form of resistivity tomography aims to model 2D subsurface layers so that it is known which layers have the potential to become weak areas in the form of cracks in the slope. While the process of identifying changes in slope stability due to the presence of weak areas based on the position of cracks using the help of FEM (finite element method) software The purpose of this research is to identify the weak plane of the slope based on the position of cracks and their effect on slope stability. The results of geoelectric testing showed the presence of weak areas in the form of cracks formed in the slope based on the resistivity value of (731.28–1712.55) Ωm. The results of the analysis of changes in slope stability due to the presence of weak areas in the form of cracks in the slope show a decrease in the safety factor (SF) value, which previously had a safety factor (SF) value of 4.272 to 3.630.
Co-Authors Agustinus Hendri, Okrobianus Ikhwan Yani, Mohammad Jarkani, Jarkani Nomeritae Sarie, Fatma Yani, Mohammad Ikhwan