PEMODELAN FISIK BENDUNGAN UNTUK PENGAMATAN GARIS FREATIS BERDASARKAN KEMIRINGAN LERENG SEBELAH HULU
Abstract: Seepage problems
that often appeared on a main-dam. The purpose of this study is to observe the
flow pattern of phreatic line that occur on the dam body and to count the
seepage discharge that come about. This research was conducted using the
seepage body model that made from yellowish clay with 70 % levels of density
and had 4,9 x 10-7 permeability values which variating upstream slope angle.
The amount of upstream slope angle that variated was 41,15°, 46,29°, and
52,74°, whereas the downstream was 50,33°. This model test research utilized 10
mm thick glass vassel with 180 cm length, 44 cm width, and 68 cm high as well
as 1 : 25 scale from the old researcher. This research had 3 high water
catchment variations, those were 35 cm, 45 cm, and 55 cm. In this research, in
the 41,15°, 46,29°, and 52,74° upstream slope angle, only in the 55 cm water
catchment condition that meet Cassagrande Method. The amount of discharge
produced from the calculation and physical modelling each for are for 41,15°,
46,29°, 52,74° was 6,01 x 10-6 cm3/det and 7,96 x 10-6 cm3/det, 5,37 x 10-6
cm3/det and 7,21 x 10-6 cm3/det, 5,81 x 10-6 cm3/det and 7,65 x 10-6 cm3/det.
The discharge differenciation from the calculation result and the research
showed that calibration modeling is not yet perfect. The result, obtaining from
this study represented that the dam body condition accompanied by variating the
upstream slope angle also affects the size of the seepage that occurs.
Penulis: Azmeri, Maimun
Rizalihadi, Rima Vinanda
Kode Jurnal: jptsipildd130628
