1 / 13

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)

denton
Download Presentation

MEKANIKA TANAH 1

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related