Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 17, Problem 17.4P
To determine
Find the average soil friction angle
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Following are the results of a standard penetration test in sand. Determine the corrected
standard penetration number, (N1)60, at various depths. Note that the water table was not
observed within a depth of 10.5 m below the ground surface. Assume that the average
unit weight of sand is 17.3 kN/m3.
Depth (m) N60
1.5 8
3.0 7
4.6 12
6.0 14
7.5 13
b)
Table Q2 provides the result of a standard penetration test in the sandy soil. The water
table was not encountered during the test. Assume that the average unit weight of
sand is 17.3 kN/m³ and use Skempton's relationship provided, determine the corrected
standard penetration numbers, (N₁)eo at various depths given (CO1, PO2) (C3)
2
Skempton's equation: C = =
1+0.010!
Table Q2
Depth (m)
Noo
1.5
3.0
4.5
6.0
7.5
|4712419|
For the soil profile described in attachment, estimate anaverage peak soil friction angle. Use Eq. (3.31b) attached
Chapter 17 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- Following is the variation of the field standard penetration number () in a sand deposit: 1.5 6 3 8 4.5 9 6 8 7.5 13 9 14 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 19 , and the saturated unit weight of sand for depth 6 to 12 is 21.2 . Use the relationship given in the equation to calculate the corrected penetration numbers. (Round your answers to the nearest whole number.) 1.5 6 3 8 4.5 9 6 8 7.5 13 9 14arrow_forwardFollowing is the variation of the field standard penetration number (N60) in a sand deposit: The groundwater table is located at a depth of 6 m. Given: the dry unit weight of sand from 0 to a depth of 6 m is 18 kN/m3, and the saturated unit weight of sand for depth 6 to 12 m is 20.2 kN/m3. Use the relationship given in Eq. (3.13) to calculate the corrected penetration numbers.arrow_forwardThe following are the results of a standard penetration test in sand. Determine the standard penetration numbers, (N₁)60(CORR), at the various depths given. Note that the water table is at depth 5.0 m. Assume that the average unit weight of sand is 15.5 kN/m³ above the water table and the saturated unit weight of sand is 17.81 kN/m³, while the unit weight of water = 9.81 kN/m³. Depth (m) 0.0 1.5 3.0 4.5 6.0 7.5 N60 0 10 15 19 24 28arrow_forward
- Refer to Problem 3.19. Using Eq. (3.51), determine the variation of the relative density with depth. Use Qc = 1.arrow_forwardQ3/ A standard penetration test was carried out at a site. The soil profile is given in Fig. 3 with the penetration values. The average soil data are given for each layer. Compute the corrected values of N60, (N1)60 and o average for sand layers only. Assume: standard 10 sampler, united state safety hammer and diameter of borehole 150mm. Depth (m) 0 12 14 Sand 7-18.5 kN/m 18.5 kN/m Sand 19.81 kN/m 2m +4+E Im N-valuearrow_forward= A standard penetration test is carried out in sand where the efficiency of the hammer n 50%. If the measured N-value at 7.5 m depth is 20, find Noo and (N₁)60. The unit weight of the sand is = 15 MR = 1 and 18.08 kN/m³. Assume ¹ = 0.95. If you know that: nsarrow_forward
- In the fall cone method, the moisture content of the soil is inversely proportional to the corresponding distance of penetration. Select one: True Falsearrow_forwardRepeat Problem 3.6 using Eq. (3.29).arrow_forwardA standard penetration test is carried out in sand where the efficiency of the hammer nH =70%. If the measured N-value at 30 ft depth is 24, find N60 and (N1)60. The unit weight of the sand is 115.0 lb/ft3. Assume nB = nS = nR =1.arrow_forward
- For the attached problem if D50 =0.8 mm, findthe N60 values at each depth. Use Eq attached with Kulhawyand Mayne values for a and c.arrow_forwardFollowing 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 16 , and the saturated unit weight of sand for depth 6 to 12 is 22.2 . Estimate an average peak soil friction angle. Use the equation (Enter your answer to three significant figures.)arrow_forwardA standard penetration test is carried out in clay where the efficiency of the hammer n 80%. If the measured N-value at 10 m depth is 24, find the corrected value of number of blows to be used for other calculations. The unit weight of the clay is 19.5 kN/m³. Assume ng = 1 and ns = 1 R = 1.arrow_forward
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