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EBK PRINCIPLES OF GEOTECHNICAL ENGINEER
9th Edition
ISBN: 9781337517218
Author: SOBHAN
Publisher: VST
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Chapter 7, Problem 7.6P
(a)
To determine
Find the hydraulic conductivity k.
(b)
To determine
Find the seepage velocity.
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The results of a constant-head permeability test for a fine sand sample having a diameter of 70 mm and a length of 140 mm are as follows (refer to Figure 7.5):• Constant-head difference = 550 mm• Water collected in 7 min = 450 cm3• Void ratio of sand = 0.8Determine:a. Hydraulic conductivity, k (cm/sec)b. Seepage velocity
The results of a constant-head permeability test for a fine sand sample having a diameter of 150 mm and a length of 300 mm are as follows
• Constant-head difference = 500 mm
• Water collected in 5 min = 350 cm3
• Void ratio of sand = 0.61
Determine:
a. Hydraulic conductivity, k (cm/sec)
b. Seepage velocity
HYDRAULIC CONDUCTIVITY
PROBLEM 1:
The results of a constant head
permeability test for a fine sand and
sample having a diameter of 150 mm
and a length of 150 mm are as follows:
Constant head difference = 40 cm
Time of collection of water = 83 sec
Weight of water collected = 392 g
Find the hydraulic conductivity
a. 0.094 cm/sec b. 0.01 cm/sec
C.
c. 0.005 cm/sec d. 0.86 cm/sec
Chapter 7 Solutions
EBK PRINCIPLES OF GEOTECHNICAL ENGINEER
Ch. 7 - Prob. 7.1PCh. 7 - Prob. 7.2PCh. 7 - Prob. 7.3PCh. 7 - Prob. 7.4PCh. 7 - Prob. 7.5PCh. 7 - Prob. 7.6PCh. 7 - Prob. 7.7PCh. 7 - Prob. 7.8PCh. 7 - Prob. 7.9PCh. 7 - Prob. 7.10P
Ch. 7 - Prob. 7.11PCh. 7 - Prob. 7.12PCh. 7 - Prob. 7.13PCh. 7 - Prob. 7.14PCh. 7 - Prob. 7.15PCh. 7 - Prob. 7.16PCh. 7 - Prob. 7.17PCh. 7 - Prob. 7.18PCh. 7 - Prob. 7.19PCh. 7 - Prob. 7.20PCh. 7 - Prob. 7.21PCh. 7 - Refer to Figure 7.24. The following data were...Ch. 7 - Prob. 7.23PCh. 7 - Prob. 7.1CTP
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- The results of a constant-head permeability test for a fine sand sample having a diameter of 150 mm and a length of 300mm are as follows; Constant Head Difference = 500mm Time of Collection of Water = 5 min. Volume of Water Collected = 350cm³ Temperature of Water = 25°C Find the hydraulic conductivity for the soil at 20°Carrow_forwardPROBLEM 2: During a constant-head permeability test on a sand sample, 260 x 10° mm³ of water were collected in 2 minutes. If the sample had a length of 100 mm, a diameter of 40 mm and a maintained head of 200mm. What is its coefficient of permeability? a. 0.769 mm/s b. 0.967 mm/s c. 1.321 mm/s d. 0.862 mm/sarrow_forwardThe results of a constant-head permeability test for a sand sample having a sectional area of 10000mm2 and a length of 200 mm are as follows: (1) Constant head difference 400mm (2) Time of collection of water = 30 seconds (3) Volume of water collected = 600 cm3. The hydraulic conductivity is: Oa. 1.0 mm/sec Ob. 1,7mm/sec c. 2.9 mm/sec O d. 0.5mm/secarrow_forward
- A falling head hydraulic conductivity test is performed on a sample of soil. 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 %3D • Head difference at time t=180 sec = 12 in a. Find the coefficient of permeability of soil b. Compute the rate of flow of water in the soilarrow_forward1.) For a constant head laboratory permeability test on a fine sand. Thefollowing values are obtained:Length of Specimen, L = 10 inchesDiameter of Specimen = 2.5 inchesHead difference, h = 2.5 inchesWater collected in 2 mins = 0.044 in3 The void ratio of the specimen is 0.34.Compute the following:a) Hydraulic Conductivity of the soil in in/minb) Discharge Velocity in in/minc) Seepage Velocity in in/min 2.) A series of direct shear test was performed on a soil sample. Thedata for the experiments are tabulated as follows: Specimen No. Normal Stress (kPa) Shearing Stress (kPa) 1 200 450 2 400 520 3 600 590 4 1000 730 a) Compute the cohesion of the soil.b) Compute the angle of internal friction.arrow_forwardSubject: Soil Mechanics Please provide a solution and a diagram For a laboratory consolidation test on a clay specimen (drained on both sides) the following results were obtained: Thickness of clay soil= 25 mm; P_1 = 50 kPa; P_2 = 120 kPa; e_1 = 0.92; e_2 = 0.78; Time for 50% consolidation= 2.5 min. Tv = 0.197. Determine the hydraulic conductivity of the clay for the loading range in m/min. a. 1.081 x 10^-3 b. 2.56 x 10^-2 c. 1.31 x 10^-7 d. 1.23 x10 ^-5arrow_forward
- The 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_forwardFor a falling-head permeability test, the following values are given: Length of specimen = 200 mm %3D Area of soil specimen = 1000 mm^2 %3D Area of standpipe = 40 mm^2 Head difference at time t = 0 = 500 mm Head difference at timt t 180 seconds = 350 mm %D %3D Determine the hydraulic conductivity of the soil in x10 4 cm secarrow_forwardThe results of a constant-head permeability test for a fine sand sample having a diameter of 150 mm and a length of 300 mm are as follows: constant head difference = 500 mm, water collected in 5 min = 350 cm3, void ratio of sand = 0.61. Determine the hydraulic conductivity.arrow_forward
- For 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_forwardA CD test was conducted on a sample of dense sand 37 mm in diameter × 77 mm long. The cell pressure was 200 kPa. The results are shown in the table below. Axial displacement (mm) 0 0.3 0.6 1.0 1.3 1.6 1.9 3.2 5.2 6.4 7.1 9.7 12.9 15.5 Axial load (N) 0 128.1 225.9 338.9 451.8 508.3 564.8 604.3 593.0 576.0 564.8 525.2 497.0 480.0 (a) Using the data in the table, plot the Deviatoric stress (y-axis) against axial strain (x-axis) graph. (b) Using the graph from (a), draw the Mohr-circle at the peak (i.e., the maximum deviatoric stress). Determine the principal stresses as well. (c) Provided that the sample is sand, draw a failure envelope on the Mohr circle from (b) and determine the friction angle (p').arrow_forwardThe results of a constant head permeability test for a fine sand are as follows: Diameter of the sample = 31 cm Length of sample = 98 cm Constant head difference = 52 cm Time of collection = 364 secs Weight of water collected = 448 grams Find the seepage velocity in cm/min. if the void ratio is 0.33. Round off to four decimal places. Answer: 0.3943arrow_forward
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