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TEKANAN REMBESAN

TEKANAN REMBESAN. Adhi Muhtadi, ST,SE,MSi. Air dlm kead statis ----> tek hidrostatis ke atas (uplift) Air mengalir lewat lap tanah ----> mendesak partikel tanah -----> tek hidro dinamis Besar tek hidrodinamis ~ fungsi gradien hidrolik ( i ) Lihat gbr 3.28:

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TEKANAN REMBESAN

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  1. TEKANAN REMBESAN Adhi Muhtadi, ST,SE,MSi.

  2. Air dlmkeadstatis ----> tekhidrostatiskeatas (uplift) • Air mengalirlewat lap tanah----> mendesakpartikeltanah-----> tekhidrodinamis • Besartekhidrodinamis ~ fungsigradienhidrolik (i) • Lihatgbr 3.28: • plgbawahadl lap kedap air • pjggrsaliran = dL • Luas pot melintangtabungaliran = dA

  3. Gaya rembesan/volume: • D = γw. i (kN/m3 ; t/m3)

  4. Pengaruh tek air thd stabilitas tanah • Tekhidrodinamis -------> pengaruhbesar -----> stabilitastanah • Tekhidrodinamismemp BV tanahtgtarahaliran • Lihatgbr 3.29, hal: 207: • pd ttk 1; arahaliranvertikalkebawah: BV efektif (γef) = γ' + D γ' = BV tanahterapung

  5. Pd ttk 2: D dan γ' bekerja saling tegak lurus ----> vektor resultan gaya miring • Pd ttk 3: arah aliran vertikal, BV efektif (γef) = γ' - D • Jika D = γ', tanah akan kehil beratnya----> tdk stabil ---> kritis, tdp gradien hidrolik kritis ---> kecep kritis (vc); Pd kond kritis: D = γw . ic • Bila kecep aliran > kecep kritis, maka: D > γ' dan γef ~ negatif pers (3.93)

  6. Kondisi Mengapung (Quick Condition) • Tek hidrodinamis mengubah keseimbangan lap tanah • Pd kead seimbang: W = γ' = D = γw. Ic ; W - D = 0 • Berat tanah terendam air: W = γ' = (1 - n)(Gs - 1). γw γ' = (Gs - 1). γw / (1+e) n = porositas; Gs = berat jenis tanah; e = angka pori; γw = BV air

  7. Pers gradien hidrolik kritis: • ic = γ' / γw • ic = (Gs - 1) / 1 +e • Perencanaan bahaya mengapung: i < ic/ SF ; SF = 3 atau 4

  8. Latihan Soal: • Kerjakan Contoh Soal 3.13 hal: 209

  9. AdhiMuhtadi TERIMA KASIH

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