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All Journal Inersia : Jurnal Teknik Sipil dan Arsitektur TEKNIK MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Teknik Sipil Rang Teknik Journal Politik Indonesia: Indonesian Political Science Review Journal La Multiapp Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil
Sriyana, Ignatius
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Social Sciences Transportation

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Geological Investigation and Treatment of the Cabean Dam Foundation Rachman, Muhammad Perwira; Sangkawati, Sri; Sriyana, Ignatius; Kurniawan, Yudi
Journal La Multiapp Vol. 7 No. 2 (2026): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v7i2.3077

Abstract

Embankment dams are critical infrastructure requiring comprehensive geological and geotechnical investigation to ensure long-term structural integrity and prevent catastrophic failure. This study presents the results of two-stage Multichannel Analysis of Surface Waves (MASW) investigations conducted at Cabean Dam core zone to characterize shear wave velocity (Vs) profiles and identify weak zones susceptible to seepage and slope instability. The first stage (2022) involved 17 survey lines while the second stage (2025) comprised 11 additional lines targeting critical areas. Shear wave velocity values ranged from 78–756 m/s, indicating significant material heterogeneity. Low Vs anomalies (78–200 m/s) were identified in the upper 0–7 meter depth at survey lines L-01, L-07, L-08, and L-09, correlating with residual soil having high permeability values up to 3.06×10⁻⁴ m/s and Lugeon values reaching 25.34 Lu. Integration of MASW data with borehole logs confirmed material classifications ranging from Site Class E (soft soil) at shallow depths to Site Class B (stiff soil) at greater depths. The identified weak zones pose significant risks for seepage, internal erosion (piping), and slope instability, requiring remedial measures including recompaction, optimized internal drainage design, and enhanced instrumentation monitoring. This research contributes methodological advancement in applying MASW as an integral component of staged investigation protocols for embankment dam projects, particularly for monitoring and refining geological-geotechnical conditions during construction phase. Results serve as a reference for practitioners and researchers in geotechnical dam engineering for improving safety and reliability of embankment dam infrastructure in Indonesia.
Limit Equilibrium Analysis of Slope Reinforcement Under Varying Pore Pressure: A Case Study of Cabean Dam Conduit Channel Rachman, Muhammad Perwira; Sangkawati, Sri; Sriyana, Ignatius
Jurnal Teknik Sipil Vol 26, No 1 (2026): Jurnal Teknik Sipil Universitas Tanjungpura
Publisher : Fakultas Teknik Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jts.v26i1.104448

Abstract

Slope instability induced by rainfall infiltration and increasing pore-water pressure is a common geotechnical problem in tropical regions. This study evaluates the effectiveness of slope-reinforcement methods applied to the conduit channel slope at Cabean Dam, Central Java, Indonesia. Stability analysis was conducted using three limit-equilibrium methods—Ordinary, Bishop Simplified, and Morgenstern–Price—implemented in SLOPE/W. Three slope conditions were analyzed: the original slope configuration, slope flattening combined with soil nail reinforcement, and slope flattening combined with shotcrete treatment. A sensitivity analysis was performed by varying the pore pressure ratio (Ru) from 0.0 to 0.7 to represent different rainfall infiltration conditions. The results indicate that the initial slope condition is unstable, with safety factors below acceptable engineering standards. Soil nail reinforcement significantly improves slope stability but remains sensitive to increasing pore pressure. The combination of slope flattening and shotcrete treatment provides the highest safety factors and the lowest sensitivity to pore-pressure variations, indicating better performance for slope stabilization in high-rainfall environments.
Co-Authors Dyah Ari Wulandari Febriani, Irawati Florentina Kusmiyati Hilmawan, Gilang Bobby Mufrodi, Syahrizal Pambudi, Yan Ahmad Christy Rachman, Muhammad Perwira Ramadan, Bimastyaji Surya Roselyn, Melfina Siwu, Wulandari Pingkan Sri Sangkawati Sachro Suharyanto Swastika, Dian Wahyudi, Andri Puji Yudi Kurniawan Yunianto, SR Eko