Principles of Foundation Engineering (MindTap Course List)
8th Edition
ISBN: 9781305081550
Author: Braja M. Das
Publisher: Cengage Learning
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Chapter 2, Problem 2.8P
To determine
Calculate the hydraulic conductivity of sand
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For a sandy soil, the following are given: • Maximum void ratio = 0.72 • Minimum void ratio = 0.46 • Hydraulic conductivity at a relative density of 80% = 0.006 cm/sec. Determine the hydraulic conductivity of the sand at a relative density of 67%.
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
For a falling-head permeability test, the following values are given:
· Length of specimen = 250 mm.
· Area of soil specimen = 1200 mm2.
· Area of standpipe = 50 mm2.
· Head difference at time t = 0 = 600 mm.
· Head difference at time t = 200 sec = 300 mm.
Determine the hydraulic conductivity of the soil in cm/sec.
Chapter 2 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 2 - Prob. 2.1PCh. 2 - Prob. 2.2PCh. 2 - Prob. 2.3PCh. 2 - Prob. 2.4PCh. 2 - Prob. 2.5PCh. 2 - Prob. 2.6PCh. 2 - Prob. 2.7PCh. 2 - Prob. 2.8PCh. 2 - Prob. 2.9PCh. 2 - Prob. 2.10P
Ch. 2 - Prob. 2.11PCh. 2 - Prob. 2.12PCh. 2 - Prob. 2.13PCh. 2 - Prob. 2.14PCh. 2 - Prob. 2.15PCh. 2 - For a normally consolidated soil, the following is...Ch. 2 - Prob. 2.17PCh. 2 - Prob. 2.18PCh. 2 - Prob. 2.19PCh. 2 - Prob. 2.20PCh. 2 - Prob. 2.21PCh. 2 - Prob. 2.22PCh. 2 - Prob. 2.23PCh. 2 - Prob. 2.24PCh. 2 - Prob. 2.25PCh. 2 - Prob. 2.26PCh. 2 - Prob. 2.27P
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- For a falling head permeability test, these values are given: Length of the soil specimen = 200 mmArea of the soil specimen = 1000 mm2Area of the standpipe = 40 mm2Head difference at time t = 0 is 500 mmHead difference at time t = 3 min is 300 mm Determine: Hydraulic conductivity of the soil in cm/sec.Head difference at time t = 100 sec.arrow_forwardLength of soil sample for constant head permeability test is 30 cm, Area of specimen is 177cm) constant head difference is so cm, total volume of water collected in 5 min is 350cm Calculate the hydraulic conductivity of the soil.arrow_forwardFor a variable head permeability test, these values are given:• Length of the soil specimen 200 mm• Area of the soil specimen 1000 mm2• Area of the standpipe 40 mm2• Head difference at time t 0 is 500 mm• Head difference at time t 3 min is 300 mma. Determine the hydraulic conductivity of the soil in cm/sec.b. What was the head difference at time t 100 sec?arrow_forward
- Determine the hydraulic conductivity of Soil A using the data obtained from the constant head test and the hydraulic conductivity of Soil B using the data obtained from the falling head test.arrow_forwardNote: Add 0.16 to the results on table before solving.a. Determine the maximum dry unit weight and OMC.b. What is the dry unit weight and moisture range at 95 % relative compaction?c. Determine the degree of saturation at the maximum dry density if Gs = 2.70.arrow_forwardFor a decreasing load permeability test, the following are given values: - Sample length: 200 mm - Soil sample area: 1000 mm² - Piezometer area: 40 mm² - Load difference at instant t = 0: 500 mm - Load difference at instant t = 180 s: 300 mm Determine the hydraulic conductivity of the soil in cm/s.arrow_forward
- 2. Situation 2 - For a constant laboratory permeability test on a fine sand, the following data are given: Length of specimen = 16 cm Diameter of specimen = 96 mm Constant Head Difference = 50 cm Volume of water collected in 4 min = 420 cc Void ratio of the soil specimen = 0.55 a. Determine the hydraulic conductivity of the soil in m/min. Round off to four decimal places. b. Determine the discharge velocity in m/min. Round off to four decimal places. c. Determine the seepage velocity in m/min. Round off to four decimal places.arrow_forwardFor a falling-head permeability test, the following values are given:• Length of specimen 8 in.• Area of soil specimen 1.6 in.2• Area of standpipe 0.06 in.2• Head difference at time t 0 20 in.• Head difference at time t 180 sec 12 in.Determine the hydraulic conductivity of the soil in in./secarrow_forwardFor a falling head permeability test, these valueare given: Length of the soil specimen = 200 mm Area of the soil specimen = 1000 mm2 Area of the standpipe = 40 mm2 Head difference at time, t = 0 min is 500 mm Head difference at time, t = 3 min is 300 mm1. Determine the hydraulic conductivity of thesoil in cm/sec.2. What was the head difference at time, t =100 sec?arrow_forward
- A layer soil has the following data: H1=3m K1=2x10^-2 cm/sH2=4m K2=3.2x10^-2 cm/sH3=6m K3=4.1x10^-2 cm/s a) Compute the equivalent coefficient of permeability in the vertical directionb) Compute the velocity of flow if h =4 m.arrow_forwardFor a constant head permeability test in a sand, the following values are given:• L 350 mm• A 125 cm2• h 420 mm• Water collected in 3 min 580 cm3• Void ratio of sand 0.61Determine:a. Hydraulic conductivity, k (cm/sec)b. Seepage velocityarrow_forwardThe data from a falling-head test on a silty clay are: Cross sectional area of soil = 1000 mm^2 Length of soil sample = 200 mm Area of stand pipe = 40 mm^2 Head difference at time t = 0 is 500 mm Head difference at time t = 3 min is 300 mm a) Determine the hydraulic conductivity of the soil in cm/sec. b) What is the head difference at time t = 100 sec in mmarrow_forward
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