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All Journal Spektrum Sipil Jurnal Teknika : Jurnal Teoritis dan Terapan Bidang Keteknikan
Hendri, Okrobianus
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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PENGARUH CAMPURAN BELERANG DAN SEMEN PORTLAND TERHADAP UJI GESER LANGSUNG DAN KUAT TEKAN BEBAS TANAH GAMBUT: Effect of Sulfur and Portland Cement Mix on Direct Shear and Unconfined Compression Strength of Peat Soil Triutami, Nova; Gandi, Suradji; Hendri, Okrobianus
Spektrum Sipil Vol 8 No 2 (2021): SPEKTRUM SIPIL
Publisher : Jurusan Teknik Sipil Fakultas Teknik Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/spektrum.v8i2.210

Abstract

Tanah gambut merupakan tipe tanah yang kurang baik sebagai tanah dasar konstruksi, dan memiliki karakteristik yang sangat lunak. Untuk memperbaiki sifat tanah gambut tersebut, maka dilakukan dengan cara stabilisasi tanah. Metode stabilisasi tanah yang digunakan yaitu menggunakan belerang dan semen portland sebagai bahan campurannya. Pengujian dilakukan dengan metode observari lapangan dan eksperimental, yang diawali pada pengambilan sampel tanah (hand boring) dan dilakukan pemeriksaan di Laboratorium yaitu sifat fisik tanah asli, pengujian geser langsung dan kuat tekan bebas. Hasil pengujian sifat fisik tanah diperoleh kadar air (w) 244,74 % , menurut ASTM D 2980 termasuk kategori slightly absorbent, diperoleh berat jenis (Gs) sebesar 1,28. Jumlah kadar serat yang diperoleh 76,74 %, menurut ASTM D 4427 tanah gambut termasuk dalam kategori gambut fibric dengan kadar serat antara > 67 %. Hasil pengujian kuat geser langsung nilai kohesi (c) meningkat sebesar 9 % dari kadar optimum belerang 5 % dan semen portland 10 % pada pemeraman 14 hari, dan sudut geser (φ) meningkat sebesar 7 % dari kadar optimum belerang 2,5 % dan semen portland 10 % pada 14 hari pemeraman. Untuk pengujian kuat tekan bebas terjadi peningkatan kuat tekan bebas (qu) sebesar 20,9 % diperoleh dari kadar optimum belerang 5 % dan semen portland 10 % dengan waktu pemeraman 14 hari sedangkan pada kohesi (c) terjadi kenaikan sebesar 10,4 % pada kadar optimum belerang 5 % dan semen portland 10 % pada pemeraman 7 hari.
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 Alexsander, Stephanus Gandi, Suradji Jarkani, Jarkani Sarie, Fatma Triutami, Nova Yani, Mohammad Ikhwan