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IDENTIFIKASI PERILAKU DEFORMASI VERTIKAL BERDASARKAN HASIL PEMANTAUAN MULTILAYER SETTLEMENT SAAT PELAKSANAAN TIMBUNAN BENDUNGAN AMERORO Alfian Arbie Simbolon; Sri Prabandiyani Retno Wardani; Suharyanto Suharyanto
Racic : Rab Construction Research Vol. 9 No. 1 (2024): JUNI
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v9i1.4615

Abstract

The Ameroro Dam, located in Southeast Sulawesi, was built by the Ministry of Public Works and Public Housing and is currently still in the process of filling. Dam deformation actually started to occur during the dam construction process and then continued during the dam's operational period after construction was completed. Therefore, it is very important to observe and analyze the deformation of the dam body since the construction period to avoid dam failure in the future. This research aims to identify the vertical internal deformation behavior of the Ameroro Dam based on data from Multilayer Settlement monitoring results. The identification is intended to assess the normal or abnormal behavior of the core zone of the dam embankment using reading data from the Multilayer Settlement instrument installed at the Ameroro Dam to determine its deformation behavior based on empirical references. The reading graph of the Multilayer Settlement monitoring results shows that the bottom magnetic plate of IMS 1-8 has experienced a stagnant decline at the embankment elevation of +88.50 m so that it is predicted that at the next embankment increase the deformation will be stable. The normal limit referred to is when the height of the embankment is less than 50 m, the total settlement is generally in the order of less than 1% to 2.5%. From the results of the analysis, the settlement value at the core of the Ameroro Dam that occurred was still within normal limits.
KAJIAN STABILITAS BENDUNGAN JLANTAH KONDISI SURUT CEPAT DENGAN METODE ELEMEN HINGGA Agung Ariyan Putra; Sri Prabandiyani Retno Wardani; Kresno Wikan Sadono
Racic : Rab Construction Research Vol. 10 No. 2 (2025): DESEMBER
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v10i2.5857

Abstract

The Jlantah Dam is a random fill dam with a vertical core zone. One of the potential hazards of the Jlantah Dam is slope failure caused by the rapid drawdown of the reservoir water level. During a rapid drawdown event, the pore water pressure does not decrease in tandem with the rapid drop in water level. This condition can be a critical factor in slope stability due to the pore water pressure within the dam body. This study aims to analyze the stability of the Jlantah Dam under rapid drawdown conditions using three daily water level reduction scenarios: 2.3 m/day (10 days), 1 m/day (23 days), and 0.75 m/day (31 days). The rapid drawdown is conducted from the normal water level (+685) to the minimum water level (+662), with a total elevation drop of 23 meters. The analysis results show that the percentage reduction in pore water pressure under rapid drawdown conditions is 48.673% for the 2.3 m/day (10 days) scenario, 57.979% for the 1 m/day (23 days) scenario, and 60.309% for the 0.75 m/day (31 days) scenario. The minimum safety factors obtained for each scenario are 1.74023, 1.67292, and 1.6783, respectively. These values remain above the acceptance criteria for stability during rapid drawdown from normal to minimum water levels.
Slope Stability Analysis of High-Plasticity Overconsolidated Clay Using PLAXIS LE Burhan Priyambodo; Sri Prabandiyani Retno Wardani; Kresno Wikan Sadono
JOURNAL OF CIVIL ENGINEERING BUILDING AND TRANSPORTATION Vol. 10 No. 2 (2026): JCEBT SEPTEMBER
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jcebt.v10i2.18290

Abstract

Slope instability in high-plasticity overconsolidated clay presents a significant challenge for infrastructure development due to the progressive reduction of soil shear strength caused by weathering and environmental changes. This study aims to evaluate the stability of a landslide slope located in Watujagir, Purworejo Regency, Central Java Province, Indonesia, using PLAXIS LE based on fully softened and residual shear strength parameters. Surface soil samples were collected from the landslide area and tested to determine the Atterberg limits. The liquid limit values were subsequently correlated with fully softened and residual friction angles using the empirical relationships proposed by Stark and Hussain. The slope geometry was reconstructed from field measurements and analyzed using the Limit Equilibrium Method implemented in PLAXIS LE. The laboratory results indicated liquid limit values ranging from 121.15% to 130.58%, representing highly plastic overconsolidated clay. The analysis produced a factor of safety of 0.990, indicating that the existing slope is in a critical unstable condition. The calculated failure mechanism corresponded to approximately 76% residual shear strength and 24% fully softened shear strength mobilization. These findings demonstrate that long-term shear strength degradation plays a dominant role in slope failure and should be incorporated into stability assessments of highly plastic overconsolidated clay slopes.
A Study of the Relationship Between the Liquid Limit and the Shear Angle of Fully Softened Clay with Residual Clay in Problematic Clay Formation in Tulungagung Regency Kukuh Mahi Sudrajat; Sri Prabandiyani Retno Wardani; Kresno Wikan Sadono
Eduvest - Journal of Universal Studies Vol. 6 No. 8 (2026): Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/eduvest.v6i8.53350

Abstract

The distribution of problematic clay rocks, or called clay shale or stiff oc (overconsolidated clay), in Indonesia is not widely known or understood by the public or construction actors regarding the potential of the nature of these rocks. Problematic clay stone is a type of clay rock that has significant shrinkage properties, especially if exposed to water and cut loss of overburden pressure. These properties can cause geotechnical problems such as soil shifts and damage to the building structures that are on them. The target of the study was to identify the values of fully softened and residual shear strength, the researcher also examined the correlation of the liquid limit in these soil types. Testing is carried out by consolidation normally. The data taken by the researcher is problematic clay soils in Tulungagung Regency, which shows a pattern of shear stress curve to normal stress similar to that of Bearpaw Shale soil, which is nonlinear in fully softened conditions and more linear in residual conditions. The results of the study show that the characteristics of problematic clay are included in the category of high plasticity clay and have high sensitivity to changes in moisture content. The relatively high development potential results of the Free Swell Index (FSI) test showed 65% and based on the classification of development potential, this value was included in the medium to high category.