Foundation Design: Principles and Practices (3rd Edition)
3rd Edition
ISBN: 9780133411898
Author: Donald P. Coduto, William A. Kitch, Man-chu Ronald Yeung
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 3.3QPP
Consider a soil that is being placed as a fill and compacted using a sheepsfoot roller (a piece of construction equipment). Will the action of the roller change the void ratio of the soil? Explain.
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The figure and the table below, shows the results of consolidation test for a soil
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TI
Applied pressure,
kPa
25
50
100
200
400
800
Voids ratio
0.634
0.619
0.583
0.523
0456
0383
0.65
0.6
0.55
0.5
0.45
0.4
of
0.35
10
100
1000
PRESSURE
0.15
0.21
0.12
no one
0.30
VOIDS RATIO
Chapter 3 Solutions
Foundation Design: Principles and Practices (3rd Edition)
Ch. 3 - Explain the difference between moisture content...Ch. 3 - A certain saturated sand has a moisture content...Ch. 3 - Consider a soil that is being placed as a fill and...Ch. 3 - A sample of soil has a volume of and a weight of...Ch. 3 - A site is underlain by a soil that has a unit...Ch. 3 - The sub-surface profile at a certain site is shown...Ch. 3 - A vertical load of 300 kN is applied to a area at...Ch. 3 - A vertical load of 20 k is applied to a area at...Ch. 3 - 3m3m footing is to be built on the surface of a 15...Ch. 3 - A 3 ft square footing carries a sustained load of...
Ch. 3 - A 2m thick fill is to be placed on the soil shown...Ch. 3 - Estimate the effective friction angle of the...Ch. 3 - Explain the difference between the drained...Ch. 3 - A soil has c=5 kPa and =32. The effective stress...Ch. 3 - A footing with an embedment of 2 m is embedded in...Ch. 3 - Prob. 3.16QPPCh. 3 - Prob. 3.17QPPCh. 3 - A 9 ft thick fill is to be placed on the soil...
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- How is the plasticity index of a soil determined?arrow_forwardSoil resistance to failure is provided by its shear strength. How is shear strength developed in different types of soil?arrow_forward11 The following are the results of a consolidation test on a sample of a clayey soil. 11.3 Pressure, o (kN/m') 1.116 25 1.108 1.055 50 100 200 0.962 0.845 400 800 1600 0.755 11 0.65 80 0.658 0.675 400 0.685 200 a. Plot the e-log o' curve h. Using Casagrande's method, determine the preconsolidation pressure. c. Calculate the compression index, C, and the ratio of CJC_arrow_forward
- Discuss whether the statement "Void ratio changes when a densely packed dry soil is being saturated" is accurate. State your reasonsarrow_forward4. What is the porosity of a soil having a void ratio of 1.234? Round off to two decimal places.arrow_forwardCalculate % Clay using the following values; a. Weight of soil= 50 g b. HR reading at 40 sec.= 25 c. Temp at 40 sec= 25 oC d. HR at 2 hrs= 16 e. Temp at 2 hrs= 26arrow_forward
- Comment on the difference between the shape and size of clay particles compared to other soil types such as silts and sands.arrow_forwardQ# 2. The following are the results of a consolidation test on a sample of a clayey soil Pressure, o' (kN/m²) 1.116 25 1.108 50 1.055 100 0.962 200 0.845 400 0.755 800 0.65 1600 0.658 800 0.675 400 0.685 200 a Plot the e, log o' curve. b. Using Casagrande's method, determine the pretonsolidation pressure. Calculate the compression index, C, and the ratio of C/C. C. (Note: Use excel for calculation and drawing. Discuss the details in your own words.)arrow_forwardHI PLEASE HELP. NEED ASAP. COMPLETE SOLUTION. SOIL MECHANICS.A soil excavated from a borrow pit has an in place dry unit weight of 18.51 kN/cu.m. In the lab, the values of dry max and min unit weights are 20.79kN/cu.m and 14.16 kN/cu.m respectively.DETERMINE THE FF: A. Compute the relative density of the soil samplein percent. B.Compute the void ratio in the natural condition if emax=0.921and emin=0.289. C.Compute the specific gravity of the soil.arrow_forward
- What are the reason for the difference in behavior between clay and silt?arrow_forwardA 8ft clay layer reaches 100% consolidation in 13 years and has a natural water content of 75%, what is the secondary compression settlement in the soil if the building life is expected to be 45 years. Report your answer to three decimal places and in inches. Coefficient of Secondary Compression, Ca 0.04 0.03 0.02 0.01 Type your answer... wy 50 Average Ca for Completely Remolded Samples Falls in This Zone 100 150 200 Natural Water Content, % FIGURE 7-21 Coefficient of secondary compression; C = ratio of decrease in sample height to initial sample height for one cycle of time on a logarithmic scale following completion of primary consolidation. Source: U.S. Department of the Navy (1971). Range Undisturbed Samples: Ca in Range of Virgin Compression Cain Range of Recompression Lies Below This Upper Limit 250 300 350 400arrow_forward• Problem 4- A soil sample from a certain excavation has the following grain size characteristics; Sieve size (mm) 2.00 0.075 0.500 0.005 0.002 % Finer 100 80 64 35 20 The group index of the soil was 17 and has a plasticity index of 24. Determine the liquid limit of the soil. GI = (F-35) [0.2 +0.005(LL-40)] +0.01 (F-15) (P.I. - 10)arrow_forward
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