Analisis Penanganan Longsoran Pada Bangunan Pelimpah Bendungan Ciawi
Analysis of Landslide Handling in the Ciawi Dam Spillway Building
Abstract
The shallow landslide on the left slope of the Ciawi Dam spillway occurred in June 2020. The landslide occurred gradually and disrupted the progress of the dam construction. Therefore, this study aims to analyze the stability of the slope and determine the safe number of the slope then providing recommendations for proper handling. The method used in this study is the limit equilibrium method with the SLOPE/W geostudio program which is run in two methods of determining safety factor, Bishop and Fellenius/Ordinary. Based on the results of the stability analysis, the safety factor is 0.915 for Bishop method and 0.852 for Ordinary method. The first attempt at handling the slopes was to reduce the slope, but this effort did not provide a significant increase in the number of safety factor. The next handling is to use the reinforcement of 3 borepiles with a depth of 35 m, 40 m, and 45 m with a distance between the piles of 40 mm with a shear strength of 150 kN. This effort provides a safety factor number of 1.754 Bishop's method and 1.546 Ordinary’s method with the result that it meets the safety requirements of slope reinforcement.
Downloads
References
Ashari, I., Sulistyowati, T., & Prabowo, A. (2018). Analisis Pengaruh Metode Terasering Pada Stabilitas Lereng Menggunakan Geoslope/W6. Spektrum Sipil, 5(2), 108–116.
Badan Meteorologi Klimatologi dan Geofisika (BMKG). (2021). Informasi Meteorologi Khusus Periode Januari-Oktober 2021. Stasiun Klimatologi Bogor.
Badan Standarisasi Nasional. (2017). SNI 8460:2017 Persyaratan Perancangan Geoteknik.
BBWS Ciliwung-Cisada. (2021). Justifikasi Teknis Penanganan Lereng Kiri dan Penyelesaian Konstruksi Pelimpah.
BBWS Ciliwung-Cisadane. (2016a). Laporan Akhir Bendungan Ciawi.
BBWS Ciliwung-Cisadane. (2016b). Laporan Pendahuluan Sertifikasi Bendungan Ciawi.
Bowles, J. (1989). Sifat‐Sifat Fisis dan Geoteknis Tanah (2nd ed.). Erlangga.
Cornforth, D. (2005). Landslides in Practice.
Direktorat Jenderal Bina Marga. (2005). Manual Perencanaan Penanganan Lereng Jalan. No. 02-2/BM/2005.
Duncan, J. M., & Wright, S. G. (2005). Soil Strength and Slope Stability. Library of Congress Cataloging.
Hardiyatmo, H. (2012). Penanganan Tanah Longsor dan Erosi. Gajah Mada University Press.
Kim, J., Jeong, S., & Regueiro, R. (2012). Instability of Partially Saturated Soil Slopes Due to Alteration of Rainfall Pattern. Eng. Geol, 147, 23–36.
Kim, M. S., Onda, Y., Uchida, T., Kim, J. K., & Songa, Y. S. (2018). Effect of Seepage on Shallow Landslides in Consideration of Changes in Topography: Case Study Including an Experimental Sandy Slope with Artificial Rainfall. Catena, 161, 50–62. https://doi.org/10.1016/j.catena.2017.10.004
Kusuma, R., & Mina, E. (2015). Analisis Stabilitas Lereng dan Perencanaan Soilnailing Dengan Software Geostudio 2007. Jurnal Fondasi, 4(1).
Muntohar, A. (2008). Proposal Ambang Hujan untuk Peringatan Dini Tanah Longsor. Seminar/Workshop Application Research for Disaster and Humanitarian.
Pramita, G., & Sari, N. (2020). Studi Waktu Pelayanan Kapal di Dermaga I Pelabuhan Bakauheni. JICE (Journal of Infrastructural in Civil Engineering), 1(1), 14–18.
Pratama, R., Muhibbi, I., Indrastono, D., & Hardiyati, S. (2014). Analisis Stabilitas Lereng dan Alternatif Penanganannya (Studi Kasus : Longsoran Jalan Alternatif Tawangmangu Sta 3+150 –Sta 3+200, Karanganyar). Jurnal Karya Teknik Sipil, 3(3), 573 – 585.
Rajagukguk, O., Turangan, A., & Monintja, S. (2014). Analisis Stabilita Lereng Dengan Metode Bishop (Studi Kasus : Kawasan Citraland sta 1000m). Jurnal Sipil Statik, 2(3), 139–147.
Sianipar, B. (2016). Perencanaan Soldier Pile Untuk Pekuatan Lereng Jalan Tol Gempol-Pandaan Sta 6+518 s/d 6+575.
Soedibyo. (2003). Teknik Bendungan. Pradnya Paramita.
Widjaja, B. (2019). Landslide and Mudflow Behavior Case Study in Indonesia: Rheology Approach. IPTEK Journal of Proceedings Series No. (3), 93.
