7.8 The following data are for a falling-head permeability test: • Length of the soil sample = 140 mm • Diameter of soil sample = 70 mm • Area of the standpipe = 19.6 mm² • At time t = 0, head difference = 500 mm • At time t = 7 min, head difference = 350 mm a. Determine the hydraulic conductivity of the soil (cm/sec) b. What was the head difference at t = 5 min?

7.8 The following data are for a falling-head permeability test: • Length of the soil sample = 140 mm • Diameter of soil sample = 70 mm • Area of the standpipe = 19.6 mm² • At time t = 0, head difference = 500 mm • At time t = 7 min, head difference = 350 mm a. Determine the hydraulic conductivity of the soil (cm/sec) b. What was the head difference at t = 5 min?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A falling head permeability test was performed on a sample of silty sand. The time required for the head to fall in the standpipe from 60 cm to the 30 cm mark was 70 min. The cross-sectional area of the standpipe was 1.25 cm2. If the height and diameter of the sample were respectively 10 and 9 cm, determine the value k in cm/min.
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For a falling head laboratory test, the following are the given values:• Length of soil specimen = 480.0 mm• Initial head = 700.00 mm• Final head = 395.00 mm• Duration of test = 5.5 mins• Area of standpipe = 0.97 sq.cm• Area of specimen = 18.0 sq.cmA. Compute for the hydraulic conductivity of the soil in cm/sec.B. Determine the head difference at t = 3.50 mins.
b) For a constant head permeability test on a sand, these values are given:Length of the specimen = 720 mmDiameter of the soil specimen = 210 mm2Head difference = 990 mmWater collected in 5.5 min = 635 cm3Void ratio of the soil = 0.54Hence, determine:i) Hydraulic conductivity of the soilii) Discharge velocityiii) Seepage velocity
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