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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Following is the variation of the field standard penetration number in a sand deposit:
The groundwater table is located at a depth of 6 . Given: the dry unit weight of sand from 0 to a depth of 6 is 18 , and the saturated unit weight of sand for depth 6 to 12 is 20.2 . Using the equation
determine the average relative density of sand.
(Enter your answer to three significant figures.)
Average =
The following table gives the variation of the field standard penetration number in a sand deposit:
The groundwater table is located at a depth of 12 . The dry unit weight of sand from 0 to a depth of 12 is 17.6 . Assume the mean grain size of the sand deposit to be about 0.8 . Estimate the variation of the relative density with depth for sand. Use the equation
(Enter your answers to three significant figures.)
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.
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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- Question 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_forwardHow to solve 7.8arrow_forward
- A soil profile consisting of three layers is shown below. Calculate the values of σ, μ, and σ’ at points A, B, C, and D.arrow_forwardA 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_forwardProblem 7.6arrow_forward
- 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/secarrow_forwardExercise 1 A soil profile is shown in Figure Calculate the values of o, u, and o' at points A, B, C, and D. Plot the variation of o, u, and o' with depth. Dry sand roundwater table Thickness (ft) Unit weight (Ib/ft) Layer no. Laver IE H = 5 H2 = 6 H3 = 8 Ya = 112 Ysat = 120 Ysat = 125 Sand I II III TTE Figure 1arrow_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.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. Calculate the total unit weight (y}) of the clay in Stratum I. Answer: Choose... +arrow_forwardThe 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 velocityarrow_forward16. For a constant laboratory permeability test on a fine sand, the following data are given: Length of specimen: 16 cm. Diameter of specimen: 97 mm. Constant head difference: 51 cm. Volume of water collected in 5.96 min.: 422 cc Void ratio of the soil specimen: 0.58 Determine the seepage velocity in m/min. Round off to four decimal places.arrow_forward
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