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MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, 9th Edition, [Instant Access], 2 terms (12 months)
9th Edition
ISBN: 9781305971257
Author: Braja M. Das; Khaled Sobhan
Publisher: Cengage Learning US
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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
Following 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.
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|
Chapter 17 Solutions
MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, 9th Edition, [Instant Access], 2 terms (12 months)
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- The 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= 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_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
- In the fall cone method, the moisture content of the soil is inversely proportional to the corresponding distance of penetration. Select one: True Falsearrow_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_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
- In a standard penetration test in sands, the blow count measured at 14 m depth was 26. An automatic hammer released by a trip with an efficiency of 70% was used in the test. The unit weight of sand is 17.5 kN/m³. Determine: (a) N60 (N1) 60 using Peck, Hanson, and Thornburn (1974) correlation with Pa = 100 kPa. The most likely value of the friction angle (not the range). The possible range of relative density per Peck et al. (1974) The Young's Modulus. The table below presents two correlations proposed for estimating Young's Modulus. kg Leonards (1986) E .cm² E (kPa): = 8N60 = aPa (kPa)N60 Kulhawy & Mayne (1990) In the table a = 5 for fine sands, 10 for clean normally consolidated sands, and 15 for clean over consolidated sands. If a specific method is not specified, you may use any possible correlations. While doing so, you must clearly indicate which correlation was used.arrow_forwardA 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_forwardThe following are the results of a standard penetration test in sand. Determine the corrected standard penetration numbers, (N,), at the various depths given. 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. Depth (m) 1.5 8 3 7 4.5 12 14 7.5 13arrow_forward
- A drilled shaft constructed in medium sand is shown in the figure below. Given information is: y = 18 kN/m', '= 38°. Sand is medium-density sand, and the average standard penetration number (N60) within 2Ds below the drilled shaft is 19. Using the method proposed by Reese and O'Neill, determine the following: (a) The net allowable point resistance for a base movement of 25 mm. (b) The shaft frictional resistance for a base movement of 25 mm. (c) The total load that can be carried by the drilled shaft for a total base movement of 25 mm. 1 m 11 m 12 m - 2 marrow_forward3. A Cone Penetration Test result were given in the table below. A. Plot the cone penetration test data (CPT) along the depth including the Friction ratio (FR) B. Indicate the soil classification with depth C. Estimate angle of shearing resistance of the soil (0) at depth 7.5 m (You should use the Robertson and Campanella, 1983 graphs in the reference text book for B and C) Depth (m) qc (MPa) fs (kPa) fr (%) Soil Classification 0.5 1.86 22.02 1.5 1.16 28.72 2.5 2.28 24.89 3.5 0.29 12.44 4.5 0.38 15.32 5.5 0.40 14.74 6.5 6.90 28.72 7.5 9.20 26.81 8.5 8.45 43.09 9.5 9.50 34.60 NOTE : Assume an average y = 16.5 kN/m³ to GWT at depth at 3m, and ysat = 20 kN/m³ for below GWT.arrow_forward3. A Cone Penetration Test result were given in the table below. A. Plot the cone penetration test data (CPT) along the depth including the Friction ratio (FR) B. Indicate the soil classification with depth C. Estimate angle of shearing resistance of the soil () at depth 7.5 m (You should use the Robertson and Campanella, 1983 graphs in the reference text book for B and C) Depth (m) qe (MPa) fs (kPa) fr (%) Soil Classification 0.5 1.86 22.02 1.5 1.16 28.72 2.5 2.28 24.89 3.5 0.29 12.44 4.5 0.38 15.32 5.5 0.40 14.74 6.5 6.90 28.72 7.5 9.20 26.81 8.5 8.45 43.09 9.5 9.50 34.60 NOTE : Assume an average y = 16.5 kN/m' to GWT at depth at 3m, and yut = 20 kN/m' for below GWT.arrow_forward
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