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 17.7P
To determine
Find the average drained friction angle
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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
14
Refer to Problem 3.19. Using Eq. (3.51), determine the variation of the relative density with depth. Use Qc = 1.
b) A geotechnical laboratory reported these results of five samples taken from a
single boring. Determine which are not correctly reported, if any, show your work.
Hint:take Yw = 9.81kN/m³
Sample #1:w=30%,Ya = 14.9 kN/m³, Ys = 27 kN/m³, clay
Sample #2:w=20%,Ya = 18 kN/m³, Ys = 27 kN/m³, silt
Sample #3:w=10%,Ya = 16 kN/m³, Y = 26 kN/m³, sand
Sample #4:w=22%,Yd = 17.3 kN/m³, Ys = 28 kN/m³, silt
Sample #5:w=22%,Yd = 18 kN/m³, Ys = 27 kN/m³, silt
Chapter 17 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- Refer to Problem 17.7 and Figure 17.16. Suppose a footing (1.5 m 1.5 m) is constructed at a depth of 1 m. a. Estimate the design values for N60 and . b. What is the net allowable load that the footing can carry? The maximum allowable 17.7 settlement is 25 mm. Use Eqs. (16.56) and (16.61). Refer to the boring log shown in Figure 17.16. Estimate the average drained friction angle, , using the Kulhawy and Mayne correlation [Eq. (17.24)]. Assume pa 100 kN/m2. Figure 17.16arrow_forwardPlease answer 17.6arrow_forwardThe following data are from a direct shear test on an undisturbed soil sample. Represent the data by a Mohr Circle and compute the direction of principal planes. Normal pressure = 16.2 kN/m2; Tangential pressure = 14.4 kN/m2, Angle of internal friction = 24°; c = 7.2 kN/m2. a. 6.77 b. 26.25 c. 57 d. 38.77arrow_forward
- The standard penetration test results of a sand deposit at a certain site are given below in tabular form. The groundwater table in located at a depth of 2 m below the ground surface. The dry and saturated unit weights of sand are 17 kN/m³ and 19.0 kN/m', respectively. For an expected 10.8 earthquake magnitude M = 6 and maximum acceleration amax = 0.1 g, will liquefaction occur? Depth (m) NF (blows/30 cm) 1.5 8 3.0 7 4.5 12 6.0 15 7.5 17 9.0 17arrow_forwardRefer to Problem 3.5. Using Eq. (3.28), determine the averagerelative density of the sand. Assume it is a fine sand.Use Eq. (3.13) to obtain (N1)60.arrow_forwardRepeat Problem 3.6 using Eq. (3.29).arrow_forward
- During a subsoil exploration program, undisturbed normally consolidated silty clay samples were collected in Shelby tubes from location A as shown in Figure below 2 m G.W.T Silty sand e = 0.72; G, = 2.69 2.2 m 3.5 m Silty clay w = 22%; G, = 2.72 5.25 m Poorly graded sand = 19.8 kN/m³ 2.6 m Ysat Following are the results of four drained, direct shear tests conducted on thearrow_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_forwardFor the soil profile described in attachment, estimate anaverage peak soil friction angle. Use Eq. (3.31b) attachedarrow_forward
- Problem attachedarrow_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 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
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