1. For a constant head laboratory permeability test on a dine sand, the following values are given: Length of specimen = 300 mm Diameter of specimen = 200 mm Head difference = 400 mm Volume of water collected in 4 min = 420 cu. cm. Void ratio of the soil specimen = 0.55 Compute the coefficient of permeability in cm/sec. a. 4.444 b. 4.178 c. 4.382 d. 4.731 2. For a falling head permeability test, the following data were recorded. Length of soil specimen = 500 mm Area of soil specimen = 16 cm² Area of stand pipe = 0.97 cm2² Head difference at time t=0 is 760 mm Head difference at time t = 6 min. is 410 mm. The test was conducted at a temp. of 20°C with a unit weight of water equal to 9.789 Kn/m³ and the viscosity of water at 20°C is 1.005x10-3 N-s/m². Compute the absolute permeability of the soil in m². a. 5.31 x 10-13 b. 5.31 x 10-12 c. 5.31 x 10-11 d. 5.31 x 10-10 3. A confined aquifer has a source or recharge as shown in the figure. The hydraulic conductivity of the aquifer is 40 m/day and its porosity is 0.25. The piezo metric head in the two wells 1000 m apart is 65 m. and 60 m respectively from a common data. The average thickness of the aquifer is 25 m and the average width is 4 km. Compute seepage velocity. a. 0.8 m/day b. 1.8 m/day c. 2.8 m/day Recharge EUR d. 3.8 m/day K EL 602 1000 m 125 m
1. For a constant head laboratory permeability test on a dine sand, the following values are given: Length of specimen = 300 mm Diameter of specimen = 200 mm Head difference = 400 mm Volume of water collected in 4 min = 420 cu. cm. Void ratio of the soil specimen = 0.55 Compute the coefficient of permeability in cm/sec. a. 4.444 b. 4.178 c. 4.382 d. 4.731 2. For a falling head permeability test, the following data were recorded. Length of soil specimen = 500 mm Area of soil specimen = 16 cm² Area of stand pipe = 0.97 cm2² Head difference at time t=0 is 760 mm Head difference at time t = 6 min. is 410 mm. The test was conducted at a temp. of 20°C with a unit weight of water equal to 9.789 Kn/m³ and the viscosity of water at 20°C is 1.005x10-3 N-s/m². Compute the absolute permeability of the soil in m². a. 5.31 x 10-13 b. 5.31 x 10-12 c. 5.31 x 10-11 d. 5.31 x 10-10 3. A confined aquifer has a source or recharge as shown in the figure. The hydraulic conductivity of the aquifer is 40 m/day and its porosity is 0.25. The piezo metric head in the two wells 1000 m apart is 65 m. and 60 m respectively from a common data. The average thickness of the aquifer is 25 m and the average width is 4 km. Compute seepage velocity. a. 0.8 m/day b. 1.8 m/day c. 2.8 m/day Recharge EUR d. 3.8 m/day K EL 602 1000 m 125 m
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:1. For a constant head laboratory permeability test on a dine sand, the following values are given:
Length of specimen = 300 mm
Diameter of specimen = 200 mm
Head difference = 400 mm
Volume of water collected in 4 min = 420 cu. cm.
Void ratio of the soil specimen = 0.55
Compute the coefficient of permeability in cm/sec.
a. 4.444
b. 4.178
c. 4.382
d. 4.731
2. For a falling head permeability test, the following data were recorded.
Length of soil specimen = 500 mm
Area of soil specimen = 16 cm²
Area of stand pipe = 0.97 cm²
Head difference at time t = 0 is 760 mm
Head difference at time t = 6 min. is 410 mm.
The test was conducted at a temp. of 20°C with a unit weight of water equal to 9.789 Kn/m³ and the
viscosity of water at 20°C is 1.005x10-3 N-s/m². Compute the absolute permeability of the soil in m².
pildies vn
a. 5.31 x 10-13
b. 5.31 x 10-12
c. 5.31 x 10-11
d. 5.31 x 10-10
3. A confined aquifer has a source or recharge as shown in the
figure. The hydraulic conductivity of the aquifer is 40 m/day and
its porosity is 0.25. The piezo metric head in the two wells 1000
m apart is 65 m. and 60 m respectively from a common data.
The average thickness of the aquifer is 25 m and the average
width is 4 km. Compute seepage velocity.
a. 0.8 m/day
b. 1.8 m/day
c. 2.8 m/day
Recharge
EURS
d. 3.8 m/day
EL 602
1000 m
125 m
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