Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 19, Problem 19.10P
(a)
To determine
Find the ultimate load carrying capacity.
(b)
To determine
Find the load-carrying capacity for a settlement of 12.7 mm.
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1. Importance of penetration test.
2. Effect of temperature, load and time on penetration values. State other
conditions.
3.8
Following are the standard penetration numbers deter-
mined from a sandy soil in the field. (Note: The unit
weight of soil for 0-6 m is 16.66 kv/m³; and is 18.5 kN/m³
from z = 6-12 m.)
Depth (m)
3
4.5
6.0
7.5
9.0
10.5
12.0
Unit weight of
soil (kN/m³)
16.66
16.66
16.66
18.5
18.5
18.5
18.5
N60
7
9
11
16
18
20
22
Using Eq. (3.30), determine the variation of the peak soil
friction angle, '. Estimate an average value of o' for the
design of a shallow foundation.
The 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 heave
Chapter 19 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
Ch. 19 - Prob. 19.1PCh. 19 - Prob. 19.2PCh. 19 - Redo Problem 19.2. Use Eq. (19.4) and Es = 600 pa....Ch. 19 - For the drilled shaft described in Problem 19.2,...Ch. 19 - Prob. 19.5PCh. 19 - Prob. 19.6PCh. 19 - Prob. 19.7PCh. 19 - For the drilled shaft described in Problem 19.7,...Ch. 19 - For the drilled shaft described in Problem 19.7,...Ch. 19 - Prob. 19.10P
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- 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_forwardIn the fall cone method, the moisture content of the soil is inversely proportional to the corresponding distance of penetration. Select one: True Falsearrow_forward8.10 The results of standard penetration tests in a granular soil deposit are as follows: Depth Standard penetration (m) number, N60 1.5 11 3.0 10 4.5 12 6.0 9 7.5 14 What will be the net allowable bearing capacity of a founda- tion planned to be 1.83 m x 1.83 m? Let D,: = 0.91 m and the allowable settlement = 25 mm, and use the relationship presented in Table 8.9.arrow_forward
- 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_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_forwardHomework (NO.1) The following table gives the variation of the field standard penetration number blows (N) in sand deposit: The ground water table is located at depth of 6m. The dry unit weight of sand from 0 to a depth of 6m is 18kN/m', and the saturated unit weight of sand for depth of 6m to 12m is 20.2kN/m³. Use the relationship to calculated correct (N) of standard penetration test against overburden effect. Depth (m) 1.5 No. of blows (N) 3 8 4.5 9. 6. 7.5 13 9 14arrow_forward
- P-3 Refer to Figure, for which L, = 2.4 m, L2 = 4.6 m, y = 15.7 kN/m³, Ysat = 17.3 kN/m³, and o'=30°, and c= 35 kN/m². Assuming Sand c' = 0 C = Water table free earth support method: a. What is the theoretical depth of embedment, D? Sand Ysat c' = 0 b. What length of sheet piles is needed? c. Determine the theoretical maximum moment in the sheet pile. d. Choose a sheet pile, from next page, if the the steel pile has a oall = 172 MN/m². %3D Clay D C b'= 0arrow_forwardA 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_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_forward
- 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 13arrow_forward- Consider a vertical trench of saturated undrained clay with p = 0, y = 16 kN/m3, and Cu = 15 kPa as shown in the following figure. Determine the factor of safety against rotating around point O. Assume that the failure surface (AB) is a quadrant. 0 نه مرکز دوران 1 r= I'm ه مرکز شتال radius: r = 3m, horizontal distance between center of mass and point O=4r/(3n) Aarrow_forwardSituation 1: A triaxial test is conducted on a cohesionless soil. Failure occurs when the deviator (plunger) stress is 360 KPa. The angle of friction of the soil is 28 degrees. Determine the following: The angle that the failure plane makes with the horizontal a.) 61 b.) 59 c.) 63 d.) 57 The confining pressure in KPa a.) 203.4 b.) 215.4 c.) 224.7 d.) 209.6 The shearing stress at failure plane in KPa a.) 152.4 b.)146.6 c.) 158.9 d.) 163.7arrow_forward
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