Question 33 A laboratory apparatus maintains a constant head in both the upper and lower reservoirs. The silt sand soil sample has a void ratio of 0.45. Given the coefficient of permeability of the soil, k=10 (mm/min), calculate the shortest time for water to flow through the soil sample? (Min) Controlled inflow Upper reservoir 185 mm 30-mm dia inlet and outlet pipes V Discharge 60 mm Lower reservoir Plug of colored water 100-mm dia X 220-mm long soil specimen

Question 33 A laboratory apparatus maintains a constant head in both the upper and lower reservoirs. The silt sand soil sample has a void ratio of 0.45. Given the coefficient of permeability of the soil, k=10 (mm/min), calculate the shortest time for water to flow through the soil sample? (Min) Controlled inflow Upper reservoir 185 mm 30-mm dia inlet and outlet pipes V Discharge 60 mm Lower reservoir Plug of colored water 100-mm dia X 220-mm long soil specimen

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter6: Hydraulic Conductivity

Section: Chapter Questions

Problem 6.7P

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The Laboratory Apparatus shown maintains aconstant head in both the upper and lowerreservoirs. The soil sample is a silty sand with ahydraulic conductivity K = 5 x 10-3 cm/sec. and amoisture content of 18.5%. Specific gravity of soilsample = 2.70. Compute the seepage velocity.Determine the time required for the plug of water topass through the soil. Compute the discharge ofwater.
PART IV: PERMEABILIT Y PROBLEM A For a constant head laboratory test on a fine sand, the following are the given values : • Length of the specimen • Di ameter of the specimen 14.0 inches 3.25 inches He ad difference 25.0 inches Water collected in 2.50 mins Void ratio A. Compute for the hydraulic conductivity of the soil in in/sec. B. Determine the discharge velocity through the soil in in/sec. c. Determine the seepage velocity in in/sec. 0.065 cubic inches 0.45
For a constant head laboratory permeability test on a fine sand, the following are given: Length of specimen = 250 mm Dia. of specimen = 62.5 mm Head difference = 450 mm Water collected in 2 min. = 484 cu.mm Determine the discharge velocity in mm/sec. 0.0789 mm/sec 0.001315 mm/sec 4.734 mm/sec 0.0438 mm/sec
From the constant head permeability test, the following values are given: Void ratio of specimen 0.46 Length of soil sample 450 mm Constant head difference 700 mm Water collected in a period of 180 seconds Cross-sectional area of soil sample 3.54 x 10-4 m³ 2.26 x 10-3 m² a.) Determine the coefficient of permeability in m/hour. b.) Compute the discharge velocity in mm/s. c.) Compute the seepage velocity in mm/s. d.) If the test was done at 24°C, what is its corrected coefficient of permeability?
PROBLEM B For a constant head laboratory test on a fine sand, the following are the given values: • Length of the specimen • Di ameter of the specimen 14.00 cm 7.60 cm Head difference 42.00 cm Water collected in 3.50 mins 395 cu.cm Void ratio 0.40 A. Compute for the hydraulic conductivity of the soil in cm/sec. B. Determine the discharge velocity through the soil in cm/sec. c. Determine the seepage velocity in cm/sec.
Question 3 4 pts Assuming the groundwater table is at ground surface and the soil bulk unit weight is 20KN/m3. At 2m depth below ground level. The pore water pressure is approximately: 200 kPa O 9.8 kPa O 98 kPa O 19.6 kPa Question 4 4 pts A soil sample is placed in a 1m long and 10cm diameter tube. A constant supply of water is allowed to flow from inlet to outlet. The total water head at the inlet is 2m and the total water head at the outlet is 1m. The hydraulic conductivity is 0.001 cm/s. Which of the following answer is correct? O The flow velocity is 25 cm/s O The hydraulic gradient in the tube is 2 O The flow velocity is 0.001 cm/s O The hydraulic gradient in the tube is 0.001
Problem Set 2: 5. A cubical sample of San Francisco Bay mud (a soft marine silty clay) has been prepared for testing in a true triaxial device. The dimensions of the sample are 76 mm by 76 mm by 76 mm. The sample has a moisture content (w) of 68.5% and a moist density (r) of 1.44 g/cm³. The average specific gravity of solids (G,) is 2.55. Determine (a) the void ratio (e) and degree of saturation (S), (b) the moist density (g) and moisture content (w) if the soil becomes saturated at the same total volume, and (c) the density (p) of the soil if all pore fluid is dried off with no change in total volume. Provide the Phase Diagram.
For the permeability test arrangement shown in Figure Qu2b, the cross-section area of the soil is 4000 mm? and the evaluated permeability of the soil is 4.0 mm/sec. With reference to Darcy's law, what is the volume of water discharged in 20 minutes in this set up? Flow Overflow 375mm Discharge -15mn 225mm Soil 150mm 300mm Figure Qu2b
Don't attempt wrong i will downvote.....A cylindrical soil sample, 7.3 cm in diameter and 16.8 cm in height, is tested in a constant-head permeability apparatus. A constant head of 75 cm is maintained during the test. After 1 minute of testing, a total of 945.7 gm of water was collected. The temperature was 20 oC. The void ratio of the soil was 0.43. Calculate the following: 1. The hydraulic gradient 2. The flow rate 3. The discharge velocity 4. The seepage force per unit volume 5. The coefficient of permeability
ll Ooredoo ? 2:38 PM O 100% Annotation 20... 山 A soil sample was collected near the Quriyat dam got the following properties: Coefficient of permeability k = 2.5x 105 m/sec, cross-sectional area = 45 cm?. A quantity of water 650 mL passed down for 15 minutes under an effective constant head of 450 mm. On oven drying, the test specimen has a mass of 500 g. Take Gs = 2.65, calculate a. Length of the soil sample in mm. b. Seepage velocity. Paragraph I Not allowed to type here
For a falling head laboratory test, the following are the given values:• Length of soil specimen = 210.00 mm• Initial head = 523.00 mm• Final head = 297.00 mm• Duration of test = 3.50 mins• Area of standpipe = 42.0 sq.mm• Area of specimen = 1050.00 sq.mmA. Compute for the hydraulic conductivity of the soil in cm/sec.B. Determine the seepage velocity if n=0.35C. Determine the head difference at t = 120 sec
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 seepage velocity in m/min. Round off to four decimal places. b. determine the discharge velocity in m/min. Round off to four decimal places.