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Journal : Rekayasa Sipil

ANALISIS PERKUATAN LERENG AKIBAT LONGSOR DI DESA DOMPYONG Endah Nurhidayah; Paksitya Purnama Putra; Indra Nurtjahjaningtyas
Rekayasa Sipil Vol. 16 No. 1 (2022): Rekayasa Sipil Vol.16. No.1
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2022.016.01.2

Abstract

An unstable slope is identical to the low value of their factor of safety (FS). Slope with low FS are in critical condition, which can cause landslides. On the other hand, the presence of triggering factor such as rain and human activities will increase the percentage of landslide. It has happened in Dompyong village. The Rocscience Slide Program, used to analyze slope stability in Dompyong village based on the simplified – bishop method. Based on the analysis, the FS value of the initial condition of slope is 0,85. Therefore, the slope is in critical condition because the FS value is less than 1,07. A combination method of retaining wall and micropiles is used to strengthen slope stability. This method can increase the FS value to 1,370. The slope is in a stable condition relatively because the FS value is more than 1,25.
Pemetaan Kerawanan Tanah Longsor di Hulu DAS Tanggul Indra Nurtjahjaningtyas; Gatrawan Muchammad Albirru; Entin Hidayah
Rekayasa Sipil Vol. 17 No. 2 (2023): Rekayasa Sipil Vol. 17 No. 2
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2023.017.02.12

Abstract

Landslides are one of the natural disasters that often occur in the Upper Tanggul Watershed. This study aims to produce a landslide susceptibility map based on the Geographic Information System (GIS). Seven landslides conditioning factors used, namely land cover, river density, slope, aspect, elevation, curvature and Normalized Difference Vegetation Index (NDVI). Landslide susceptibility areas were mapped using the frequency ratio and weights-of-evidence methods. The accuracy of the landslide susceptibility maps generated from both methods is validated using the Area Under Curve (AUC). The estimation results of the AUC plot show that the susceptibility map using the frequency ratio model has an accuracy of 92,6% and the weights-of-evidence method has an accuracy of 90,1%.
Stability Analysis of Replacement Material in Dam Body at Meninting Dam Wildan Faris Alamudi; Indra Nurtjahjaningtyas; Luthfi Amri Wicaksono
Rekayasa Sipil Vol. 19 No. 1 (2025): Rekayasa Sipil Vol. 19 No. 1
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2024.019.01.6

Abstract

Embankment material in dam construction is an important aspect that needs to be considered. The lack of embankment material around the dam is a problem in the Meninting Dam construction project, so it uses materials outside the dam area. With the change in the embankment material used, research is needed on the stability of the dam body. This study aims to determine the characteristics of the replacement material, seepage capacity, uplift force, and slope stability safety factor at the dam. Physical tests are used to determine the physical characteristics of the soil (moisture content, soil specific gravity, rock specific gravity, soil plasticity index filter analysis), while the mechanical test is performed to determine the soil's movement, strength, stiffness, and deformation. This study also uses software assistance, such as Geostudio from Rockscience slide, to calculate a slope's stability level. The results showed that the value of the safety factor obtained on the upstream slope without earthquake is 3.463, the upstream slope with OBE earthquake is 2.057, the upstream slope with MDE earthquake is1.588, the downstream slope without earthquake is 3.117, the downstream slope with OBE earthquake is 2.288, downstream slope with MDE earthquake is 1.898. The value of the safety factor is declared safe because the value obtained is >1.5 conditions without an earthquake and >1.2 conditions with an earthquake. The uplift value on every equipotential is 10.58 t/m2. The value of seepage capacity that comes out downstream of the dam is 4,529 x 10-5 m3- seconds. Seepage capacity is said to be safe because < 0.0127 m3- seconds. The lack of stone material as the main constituent of dam deposits in the research area is the main factor in this study, which focuses on finding the value of the safety factor, lifting force, and seepage capacity of the replacement material for dam deposits. This research will use soil-filling material as a substitute for the Constituent stones, which are very limited in number at the research site.