A falling head permeability test on a specimen of fine sand (Area = 12.5 cm², Length = 10 cm) yielded hydraulic conductivity of 6.2 x 104 cm/s. The dry mass of the sand specimen was 195 g, and the specific gravity of the soil solids was 2.71. The test temperature was 23°C. After the test, the sand was dried, recompacted to a void ratio of 0.670 and retested using the same head difference and time interval but at a temperature of 20°C. Estimate the hydraulic conductivity of the sand during the second test. (Hint: the void ratio during the second test is different but the amount of solids and the specimen area remain the same).
A falling head permeability test on a specimen of fine sand (Area = 12.5 cm², Length = 10 cm) yielded hydraulic conductivity of 6.2 x 104 cm/s. The dry mass of the sand specimen was 195 g, and the specific gravity of the soil solids was 2.71. The test temperature was 23°C. After the test, the sand was dried, recompacted to a void ratio of 0.670 and retested using the same head difference and time interval but at a temperature of 20°C. Estimate the hydraulic conductivity of the sand during the second test. (Hint: the void ratio during the second test is different but the amount of solids and the specimen area remain the same).
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Q3. A falling head permeability test on a specimen of fine sand (Area = 12.5 cm², Length
= 10 cm) yielded a hydraulic conductivity of 6.2 x 104 cm/s. The dry mass of the sand
specimen was 195 g, and the specific gravity of the soil solids was 2.71. The test
temperature was 23°C. After the test, the sand was dried, recompacted to a void ratio
of 0.670 and retested using the same head difference and time interval but at a
temperature of 20°C. Estimate the hydraulic conductivity of the sand during the
second test. (Hint: the void ratio during the second test is different but the amount of
solids and the specimen area remain the same).
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k = D10*(γw/μ)*(C*e3)/(1+e)
Where does this formula come from, it is not one that I could find in our class notes. Also how was the dynamic velocity calculated?
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