Download - HYDRAULIC HEAD
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HYDRAULIC HEAD
21
V
Hukum Bernoulli pada aliran saluran
datum
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HYDRAULIC HEADHukum Bernoulli pada aliran air tanah
Karena kecepatan aliran air tanah sangat kecil, maka
0
Maka,
Dimana, he = hydraulic head antara titik 1 dan 2
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CONTOH
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FLOW NET
a. Flow net in an solid dam b. Flow net in an earth dam
Flow net adalah jaring-jaring aliran air, dimana berlaku garis alir () ortogonal terhadap garis tekanan (h)
Merupakan solusi dari pers. Laplace
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CREEP LENGTH
Scoured
Creep length, L
he
L = Lv + 1/3 Lh
Keterangan:Lv = lengths of vertical flow pathsLh = lengths of horizontal paths
Kemiringan ≤ 45 termasuk Lh > 45 termasuk Lv
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CREEP LENGTH
Save Length L
ehL ≥
ehL (ijin)
(Tabel 5.1)
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CREEP LENGTHContoh,
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CONTOHContoh,
+84
+74
30 m 3
3 m
4 m
Medium sand, creep head rations ijin = 6
Coba anda selidiki keamanan tubuh bendung tersebut dari bahaya creep,
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SECURITY (Pengamanan)
1. Memasang sheet piles (turap)
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SECURITY (Pengamanan)
2. Memasang impervious blanket (lapisan kedap air) atau graded fillter
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CONTOHContoh,
+84
+74
30 m 3
3 m
4 m
Medium sand, creep head rations ijin = 6
a. jika digunakan turap untuk meningkatkan keamanan bendung terhadap creep, berapa panjang turap harus dipasang.
b. Jika digunakan impervious blanket (lapisan kedap air) di upstream, berapa panjang lapisan tersebut.