Principles of Foundation Engineering, SI Edition
8th Edition
ISBN: 9781305446298
Author: Braja M. Das
Publisher: Cengage Learning US
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Chapter 3, Problem 3.6P
To determine
Find the average peak soil friction angle.
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3. Following are the results of a standard penetration test in fine dry sand.
N60
Depth (m)
1.5
7
13
3.0
18
4.5
22
6.0
7.5
24
For, the sand deposit, assume the mean grain size, D50, to be 0.26 mm and the
unit weight of sand to be 15.5kN/m3. Estimate the variation of relative density
with depth using the correlation developed by Cubrinovski and Ishihara.
Assume pas100kN/m2.
denined friction
21
The results of a constant head permeability test for a fine sand are as follows:
Diameter of the sample = 37 cm
Length of sample = 92 cm
Constant head difference = 78 cm
Time of collection = 337 secs
Weight of water collected = 375 grams
Find the seepage velocity in cm/min. if the void ratio is 0.6. Round off to four decimal places.
P-1 A soil profile is shown
in Figure along with the
standard penetration
numbers in the clay layer.
Use provided equations to
Dry sand
y = 16.5 kN/m³
1.5 m
Groundwater
table
Sand
1.5 m
N60
Ysat = 19 kN/m³
determine the variation of
1.5 m
• 8
Cu and OCR and
preconsolidation pressure
o', with depth. What is the
average value of c, and
OCR?
Clay
1.5 m
Ysat = 16.8 kN/m³
* A•8
1.5 m
• 9
1.5 m
10
Sand
0.689
0.29N0.72
Pa
Си
N60
OCR = 0.193
o = 0.47NPa
%3D
%3D
Shahid Chamran University of Abvaz
1 ר ר ררפ
Chapter 3 Solutions
Principles of Foundation Engineering, SI Edition
Ch. 3 - Prob. 3.1PCh. 3 - Prob. 3.2PCh. 3 - Refer to Figure P3.3. Use Eqs. (3.10) and (3.11)...Ch. 3 - Prob. 3.4PCh. 3 - Prob. 3.5PCh. 3 - Prob. 3.6PCh. 3 - Prob. 3.7PCh. 3 - Prob. 3.8PCh. 3 - Prob. 3.9PCh. 3 - Prob. 3.10P
Ch. 3 - Prob. 3.11PCh. 3 - Following are the standard penetration numbers...Ch. 3 - Prob. 3.13PCh. 3 - Prob. 3.14PCh. 3 - Prob. 3.15PCh. 3 - Prob. 3.16PCh. 3 - Prob. 3.17PCh. 3 - Prob. 3.18PCh. 3 - Prob. 3.19PCh. 3 - Prob. 3.20PCh. 3 - Prob. 3.21PCh. 3 - Prob. 3.22PCh. 3 - Prob. 3.23PCh. 3 - Prob. 3.24PCh. 3 - Prob. 3.25PCh. 3 - Prob. 3.26PCh. 3 - Prob. 3.27P
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- Geotechnical Engineering The following are the results of a standard penetration test in sand. Estimate the soil friction angle at the 3.0 meter depths given N60 =7 . Note that the water table was not observed within a depth of 12 m below the ground surface. Assume that the average unit weight of sand is 15.5 kN/m3 and Pa = 100 kN/m2. a. 44.6 b. 37.6 c. 38.9 d. 34.4arrow_forwardQuestion 40 The results of a constant head permeability test for a fine sand are as follows: Diameter of the sample = 25 cm Length of sample = 80 cm Constant head difference = 77 cm Time of collection = 388 secs Weight of water collected = 340 grams Find the seepage velocity in cm/min. if the void ratio is 0.49. Round off to four decimal places.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
- A soil profile is shown in Figure 6.24. Calculate the values of o, u, and o at points A, B, C, and D. Plot the variation of ơ, u, and ơ with depth. We are given the values in the table. Layer No. Thickness (m) Unit weight (kN/m³) H = 2 H2 = 3 = 7 I Ydry = 15 Ysat = 17.8 II %3D III %3D Ysat = 18.6arrow_forwardHYDRAULIC 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/secarrow_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_forward
- A cone penetration test result of a deposit of normally consolidated dry sand are given below. Estimate the drained friction angle of the sand using Kulhawy and Mayne's equation. The unit weight of the sand is 100 pcf. Depth ft 5.0 10.0 15.0 20.0 25.0 30.0 45 38 42 40 Tip resistance of cone, qc psi 300 600 800 1200 1400 1800arrow_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_forwardIn a deposit of normally consolidated dry sand a cone penetration test was conducted. Following are the result: Depth(m) Point resistance of cone, qc (MN/m²) 1.5 2.06 3.0 4.23 4.5 6.01 6.0 8.18 7.5 9.97 9.0 12.42 Assuming the dry unit weight of sand to be 16kN/m³, estimale the average peak friction angle, ф’, fo the sand. Use ф’=tan ¯1((0.38+0.27log(qc/ σ’o))arrow_forward
- A soil boring shows the following soil profile and laboratory test results. A piezometer shows the long-term groundwater table is at the ground surface. Stratum I, 0 to 40 ft, clay: Yd= 86 pcf and w = 27.9% Stratum II, 40 to 60 ft, medium-dense fine sand: w = 25% and Yd= 100 pcf Note: the unit weight of water (yw) is 62.4 pcf. Use the above information to answer the next eight questions.arrow_forwardA soil boring shows the following soil profile and laboratory test results. A piezometer shows the long- term groundwater table is at the ground surface. Stratum I, 0 to 40 ft, clay: Yd= 86 pcf and w = 27.9% Stratum II, 40 to 60 ft, medium-dense fine sand: w = 25% and Yd = 100 pcf Note: the unit weight of water (Yw) is 62.4 pcf. Use the above information to answer the next eight questions. Calculate the total unit weight (y}) of the clay in Stratum I. Answer: Choose... +arrow_forwardA constant-head test was conducted on a sample of soil 15 cm long and 60 cm^2 in cross-sectional area. The quantity of water collected was 50 cm^3 in 20 seconds under a head difference of 24 cm. if the porosity of the sand is 55 % calculate the seepage velocity in cm/s. a. 1.0 x 10^-1 b. 4.3 x 10^-3 c. 3.47 x 10^-2 d. 2.6 x 10^-6arrow_forward
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