STUDI STABILITAS BENDUNGAN URUGAN BATU PADA TIGA KONDISI OPERASI WADUK DAN PERUBAHAN MUKA AIR CEPAT
DOI:
https://doi.org/10.35194/jmts.v8i02.5887Abstract
Bendungan urugan batu sangat dipengaruhi oleh fluktuasi muka air waduk, yang berdampak pada tekanan air pori, tegangan efektif, dan stabilitas lereng. Studi ini mengevaluasi stabilitas lereng pada tiga kondisi operasi utama: Muka Air Minimum (MAM), Muka Air Normal (MAN), dan Muka Air Banjir (MAB), serta kondisi transien berupa kenaikan muka air cepat (rapid rising) dan penurunan muka air cepat (rapid drawdown). Analisis rembesan dilakukan dengan pendekatan steady-state untuk kondisi MWL, NWL, dan FWL, serta pendekatan transien untuk rapid rising dan rapid drawdown menggunakan metode elemen hingga. Faktor keamanan dihitung menggunakan metode Morgenstern–Price. Hasil analisis menunjukkan bahwa pada kondisi steady-state, faktor keamanan lereng hulu masing-masing adalah 1,95 (MWL), 2,35 (NWL), dan 2,39 (FWL), sedangkan lereng hilir tetap stabil dalam kisaran 1,99–2,00 karena aliran rembesan tidak menembus inti kedap air. Pada kondisi rapid drawdown, faktor keamanan menurun akibat ketidakseimbangan antara tekanan hidrostatik dan tekanan air pori internal, sedangkan selama rapid rising faktor keamanan meningkat karena adanya tambahan tahanan dari tekanan hidrostatik. Seluruh nilai faktor keamanan memenuhi standar minimum yang dipersyaratkan, sehingga struktur dinyatakan stabil pada semua skenario operasi.References
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[4] F. L. Jiang, Z. G. Yang, G. H. Li, S. Y. Feng, and B. Lei, “The Influencing Factors’ Identification and Analysis of Rockfill Dam Slope’s Stability in Tailing Pond Based on RS and PCA,” Appl. Mech. Mater., vol. 724, pp. 144–147, 2015, doi: 10.4028/www.scientific.net/amm.724.144.
[5] S. Yu, L. H. Chen, Z. P. Xu, and N. Chen, “Analysis of Earth-Rockfill Dam Slope Stability by Strength Reduction Method Based on Nonlinear Strength,” Adv. Mater. Res., vol. 243–249, pp. 2271–2275, 2011, doi: 10.4028/www.scientific.net/amr.243-249.2271.
[6] Y. Qi, X. Cao, R. Cao, J. Huang, A. Yan, and D. Xu, “The Critical Role of <i>c</I> and <i>?</I> in Ensuring Stability: A Study on Rockfill Dams,” Open Geosci., vol. 16, no. 1, 2024, doi: 10.1515/geo-2022-0712.
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[8] R. Pang and L. Song, “Stochastic Dynamic Response Analysis of the 3D Slopes of Rockfill Dams Based on the Coupling Randomness of Strength Parameters and Seismic Ground Motion,” Mathematics, vol. 9, no. 24, p. 3256, 2021, doi: 10.3390/math9243256.
[9] Z. Kahot, R. Dkiouak, and A. Khamlichi, “Reliability Analysis of Slope Stability in Earthen Dams Following Rapid Drawdown,” Int. Rev. Appl. Sci. Eng., vol. 10, no. 1, pp. 101–112, 2019, doi: 10.1556/1848.2018.0011.
[10] M. K. Malik and I. R. Karim, “Seepage and Slope Stability Analysis of Haditha Dam Using Geo-Studio Software,” Iop Conf. Ser. Mater. Sci. Eng., vol. 928, no. 2, p. 22074, 2020, doi: 10.1088/1757-899x/928/2/022074.
[11] H. Zhang, Q. Li, J. Wang, and B. Fu, “The Impact of Lenses on the Seepage Failure of Tailings Dam,” PLoS One, vol. 19, no. 8, p. e0305425, 2024, doi: 10.1371/journal.pone.0305425.
[12] S. Athani, Shivamanth, C. H. Solanki, and G. R. Dodagoudar, “Seepage and Stability Analyses of Earth Dam Using Finite Element Method,” Aquat. Procedia, vol. 4, pp. 876–883, 2015, doi: 10.1016/j.aqpro.2015.02.110.
[13] L. Ormann, M. A. Zardari, H. Mattsson, A. Bjelkevik, and S. Knutsson, “Numerical Analysis of Strengthening by Rockfill Embankments on an Upstream Tailings Dam,” Can. Geotech. J., vol. 50, no. 4, pp. 391–399, 2013, doi: 10.1139/cgj-2012-0255.
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[17] N. R. Morgenstern and V. E. Price, “The Analysis of the Stability of General Slip Surfaces,” Géotechnique, vol. 15, pp. 79–93, 1965.
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2025-12-13
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