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All Journal Journal of Geoscience, Engineering, Environment, and Technology Jurnal Teknik Sipil dan Perencanaan
Ritnawati
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Environmental Science Physics

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Impact of River Infrastructure on Sediment Distribution to Maintain Reservoir Lifespan: A Case of the Bili-Bili Reservoir, Jeneberang Basin, Indonesia Hasnawi, Mursyid Hasnawi; Ritnawati; Mahyuddin; La Ode Agisaqma; Muhammad Subri
Jurnal Teknik Sipil dan Perencanaan Vol. 27 No. 2 (2025): Jurnal Teknik Sipil dan Perencanaan
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v27i2.23178

Abstract

This study investigates the impact of river infrastructure on sediment distribution in the Bili-Bili Reservoir. Bathymetric data obtained using an echo-sounding sonar system were processed with Surfer 14 to analyze reservoir bottom morphology, storage capacity, and sediment accumulation. Hydrological modeling with NRECA calibration was combined with field measurements to estimate sediment inflow and storage loss. Results show cumulative sedimentation increased by 42% (1997–2005), 33% (2005–2011), and 25% (2011–2017), with a peak deposition of 21.74 × 10⁶ m³ in 2005. Following the construction of sabo dams, consolidation dams, and check dams in 2011, sedimentation rates decreased by 57% relative to 2005. Reservoir capacity declined from 365 × 10⁶ m³ in 1997 to 264 × 10⁶ m³ in 2017, reducing the effective service life by approximately 6.5 years. The remaining lifespan of the reservoir in 2017 was 24 years and 4 months, compared to the original design life. These findings emphasize that periodic dredging (every four years), monthly sediment removal at the consolidation dam, and sediment trapping in the Jeneberang watershed are essential to sustain reservoir performance.
A Study On Soil Bearing Capacity Strengthening Using Soil Cement On Jagebob Road With Unconfined Compression Test Erdawaty; Ritnawati; Fitriana, Tati; Adriati, Yolly; Tondok, Sapri Sampe
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 4 (2025): JGEET Vol 10 No 04 : December (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.4.24848

Abstract

This study investigates the improvement of soil bearing capacity through the application of soil–cement stabilization on Jagebob Road using the Unconfined Compression Test (UCT). The research aims to evaluate how curing duration affects the compressive strength development of soil cement mixtures. Laboratory experiments were conducted on cohesive soil samples with curing periods of 0, 3, and 7 days to observe the changes in both physical and mechanical properties. The results show that at 0 days of curing, the compressive strength remained low (0.103–0.114 kg/cm²) due to incomplete hydration. After 3 days, a significant increase in strength was observed, reaching up to 0.295–0.305 kg/cm², indicating the beginning of cement hydration and improved particle bonding. At 7 days, the soil achieved even higher compressive strength as the hydration process produced more calcium silicate hydrate (C-S-H) and calcium hydroxide (Ca(OH)₂), which enhanced the density and bonding of the soil matrix. These findings confirm that the curing period plays a crucial role in strengthening soil cement. Therefore, a curing duration of at least seven days is recommended to achieve optimal mechanical performance and ensure improved bearing capacity of stabilized soils for road infrastructure such as Jagebob Road.
Co-Authors Adriati, Yolly Erdawaty Fitriana, Tati Hasnawi, Mursyid Hasnawi La Ode Agisaqma Mahyuddin Muhammad Subri Tondok, Sapri Sampe