MEKANIKA TANAH 1 PERTEMUAN III

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

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

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

UNCONFINED AQUIFER (AKIFER BEBAS) Field Test UNCONFINED AQUIFER (AKIFER BEBAS)

UNCONFINED AQUIFER (AKIFER BEBAS) Field Test UNCONFINED AQUIFER (AKIFER BEBAS)

CONFINED AQUIFER (AKIFER TERKEKANG ) Field Test CONFINED AQUIFER (AKIFER TERKEKANG )

CONFINED AQUIFER (AKIFER TERKEKANG ) Field Test CONFINED AQUIFER (AKIFER TERKEKANG )

Layered Soil

Layered Soil

When equilibrium flow was reached, the following data were obtained: 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?

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