Hubungan Antara Elevasi Muka Air Waduk Dan Panjang Lintasan Rembesan Terhadap Debit Rembesan Pada Bendungan Urugan Batu Inti Tegak (Studi Kasus Bendungan Jatibarang)

Abstract

Rockfill dams have better stability than homogeneous soil dams. It allows to design the dam more slim with a higher slope. The disadvantage of rockfill dam is in the core zone as an impermeable zone. Zoned vertical core rockfill dam is a combination of various material properties. Geometry and drainage design will affect the seepage and phreatic line properties that occur. Numerical modeling and calculations are used to calculate the seepage profile more accurately. The combination of the parameters of the permeability coefficient (K), reservoir water level (Δh) and the length of the seepage path (L) can be used to determine the relationship between parameters with the same unit. 2D modeling take into account saturated/unsaturated conditions with steady state on each parameter. This study uses the Jatibarang-Indonesia dam as a basic model. The seepage profile at condition K1 (k = 1x10-5cm/sec) is q/k = -0.0018 (h2/L)2 + 1.3496h2/L + 53.241 and the seepage profile K2 (k=1x10-7cm/s) is q/k = -0.1521 (h2/L)2 + 90.402h2/L + 5480.2. This equations can be used to estimate seepage that occurs in a dam of other rock fill zoned vertical core dam based on the permeability coefficient value (K) more practically for all values of Δh and L reviewed.Keywords: Seepage, Rockfill Dam, Permeability, FEM, Numerical Analysis

Simulasi Keruntuhan Bendungan Jatibarang Kota Semarang menggunakan Program HEC – RAS 2D

“…Keadaan semacam ini juga dapat berakibat terangkutnya butiran tanah halus, sehingga terjadi pipa-pipa didalam tanah. Berdasarkan Pedoman Perhitungan Rembesan oleh Kementrian PUPR, angka keamanan bendungan terhadap piping minimal sebesar empat [6]. Angka keamanan tersebut didapatkan dari pembagian antara gradien keluaran kritis dan gradien keluaran dari hasil analisis rembesan.…”

“…Gambaran dan nilai parameter pada zona material timbunan pada tubuh Bendungan Jatibarang dapat dilihat pada Gambar 4 dan Tabel 1. Nilai parameter timbunan yang digunakan untuk pemodelan rembesan merefer hasil penelitian Siswanto [6]. 4.…”

Seepage Modeling in Embankment Dams With Various Sub Soil Characteristics

“…Several previous studies that have discussed seepage and slope stability using GeoStudio Software are: determine the effect of reservoir water level fluctuations on seepage discharge and flow patterns that occur within the dam body; determine the profile, seepage discharge, and the value of the permeability coefficient; analyze leachate seepage in clay soils including discharge and seepage velocity; and determine the water discharge in the excavated area, the number of dewatering wells, the magnitude of the uplift force at the base of the excavation area, and the value of seepage at the base of the retaining wall [6][7][8][9].…”

Alternatif Perencanaan Inti Tubuh Bendungan Semantok Menggunakan Geomembran

“…Pada saat pembangunan dan pengoperasian, bendungan direncanakan agar memenuhi kriteria keamanan bendungan yaitu stabilitas dan rembesan yang didasarkan dalam kondisi muka air banjir, muka air normal, muka air minimum, dan rapid drawdown. Berdasarkan penelitian dari (Siswanto, 2019) & (Buldan, 2021) menyatakan bahwa kegagalan bendungan akibat rembesan mempunya frekuesi resiko sebesar 25% dibandingkan akibat faktor limpasan, kebocoran pipa saluran, kerusakan timbunan bagian hulu, stabilitas lereng dan penyebab lainnya (gempa, likuifaksi, sabotase dll). Menurut (Kawy, 2021) bahwa 80% kejadian kegagalan bendungan akibat rembesan.…”