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MEKANIKA TANAH 1

MEKANIKA TANAH 1. PERTEMUAN III Determination of Permeabilty Coefficient. Oleh : Arwan Apriyono. PROGRAM STUDI TEKNIK SIPIL JURUSAN TEKNIK FAKULTAS SAINS DAN TEKNIK UNSOED TAHUN 2010. Introduction. LABORATORY CONSTANT HEAD (TINGGI KONSTAN) FALLING HEAD (TINGGI JATUH)

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MEKANIKA TANAH 1

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  1. MEKANIKA TANAH 1 PERTEMUAN III Determination of Permeabilty Coefficient Oleh : Arwan Apriyono PROGRAM STUDI TEKNIK SIPIL JURUSAN TEKNIK FAKULTAS SAINS DAN TEKNIK UNSOED TAHUN 2010

  2. Introduction • LABORATORY • CONSTANT HEAD (TINGGI KONSTAN) • FALLING HEAD (TINGGI JATUH) • FIELD • UNCONFINED AQUIFER (AKIFER BEBAS) • CONFINED AQUIFER (AKIFER TERKEKANG ) • INCONSTANT WATER HEIGHT (TINGGI AIR TIDAK TETAP)

  3. Lab Test CONSTANT HEAD (TINGGI KONSTAN) • SUITABLE FOR SANDY SOIL, SAND OR GRAVEL WHICH HAVE BIG VOID RATIO VALUE • BASIC EQUATION :

  4. Lab Test FALLING HEAD (TINGGI JATUH) • MORE ECONOMICAL FOR LONG TERM TEST • Suitable For Clayed Soil that have low k • BASIC EQUATION :

  5. UNCONFINED AQUIFER (AKIFER BEBAS) Field Test

  6. UNCONFINED AQUIFER (AKIFER BEBAS) Field Test

  7. CONFINED AQUIFER (AKIFER TERKEKANG ) Field Test

  8. CONFINED AQUIFER (AKIFER TERKEKANG ) Field Test

  9. Layered Soil

  10. Layered Soil

  11. Example • A pumping test was performed in a well penetrating a confined aquifer to evaluate the coefficient of permeability of the soil in the aquifer. • When equilibrium flow was reached, the following data were obtained: • Equilibrium discharge of water from the well = 200 gal/min. • Water levels (h1 and h2) = 15 and 19 ft at distances from the well (r1 and r2) of 60 and 180 ft, respectively. • Thickness of aquifer = 20 ft • Coefficient of permeability of the soil in the aquifer?

  12. Example • A nonhomogeneous soil consisting of layers of soil with different permeabilities. • Average coefficient of permeability in the horizontal direction and vertical direction 1.5 m Kx = 1.2 x 10-3 cm/s Ky = 2.4 x 10-4 cm/s Kx = 2.8 x 10-4 cm/s Ky = 3.1 x 10-5 cm/s 2.0 m Kx = 5.5 x 10-5 cm/s Ky = 4.7 x 10-6 cm/s 2.5 m

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