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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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|
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
28
=
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:
ns
Chapter 17 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- 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_forwardPlease answer 17.6arrow_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_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
- A cut slope was excavated in sand. The slope is shown in following attachment . To find the properties of the sand, representative samples were taken for the soil and tested in atriaxial apparatus. A consolidated drained triaxial test was conducted. The result is given below:Chamber pressure = 103 kN/m2Deviator stress at failure = 234.6 kN/m2We know the unit weight of the sand is 16 kN/m3.Use the ordinary method of slices (use 7 slices) and estimate the factor of safety against sliding forshown slip surface and comment on the calculated factor of safety.Please note that:1. The figure is not in scale. You may resketch it in scale and calculate the factor of safety2. The slip surface is circular and passes through the toe of the embankmentarrow_forwardGeotechnical 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_forwardThe figure below shows a proposed site where an excavation will be made. The 12 ft layer of sand will be removed, so that the top of the 30 ft normally consolidated clay layer will be exposed (Assume that changes in GWT do not affect γt of clay). a. Assume that the water-table location remains the same during excavation. Compute the σ, σ′v, and u values at the middle of the clay layer before and after the excavation b. Assuming 1-D conditions, compute how much the clay layer will deform due to this excavation, in inches. Specify whether this is settlement or heavearrow_forward
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