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 2, Problem 2.7QPP
Using the data shown in Figure 2.5 determine the probability that the tangent of the friction angle for the mudstone at the Confederation Bridge site is less than 0.25.
Figure 2.5
Histogram of tangent of residual friction angle of mudstone at the Confederation Bridge site, Canada.
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Students have asked these similar questions
Q.64 In an unconfined compression test, a sample clay 100 mm and 50 mm in diameter fails
under a load of 150 N at 10% strain. What is the shearing resistance taking into account
the effect of change in cross-section of the sample?
(a) 0.068 N/mm2
(c) 0.034 N/mm2
(b) 0.088 N/mm2
(d) 0.044 N/mm?
Ans. (a)
Direct shear test was conducted on soil specimen. It was observed that the specimen failed when V = 137KPa and P = 268KPa. In other soil sample, it failed at V = 210KPa and P = 412KPa.
Determine the cohesion of the soil?
Determine the internal angle of friction?
What is the axial compressive stress when V = 243KPa
2. A sample of saturated clay of height 20 mm and water content 30% was tested in an
oedometer. Loading and unloading of the sample were carried out. The thickness Hf of
the sample at the end of each stress increment/decrement is shown in the table below.
o: (kPa)
H, (mm)
100
200
400
200
18.68
100
18.75
20
19.31
18.62
a. Plot the results as void ratio versus o'z (log scale).
b. Determine Cc and Cr.
Chapter 2 Solutions
Foundation Design: Principles and Practices (3rd Edition)
Ch. 2 - Classify the uncertainty associated with the...Ch. 2 - Figure 2.1 shows the PDF for a normal distribution...Ch. 2 - List three sources of epistemic uncertainty...Ch. 2 - Using a random number generator create a sample of...Ch. 2 - A certain column will carry a dead load estimated...Ch. 2 - A simply supported beam has a length of 3 m and...Ch. 2 - Using the data shown in Figure 2.5 determine the...Ch. 2 - The capacity for a certain foundation system is...Ch. 2 - We wish to design a shallow foundation with a...Ch. 2 - Prob. 2.10QPP
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- A sample of soil 50 mm in diameter was tested in direct shear. A normal force P was first applied to the sample and a direct shear force V was applied. The following combinations of P and V caused the specimen to exibit failure.P = 268 NP = 412 NV = 137 N V = 210 N Estimate the nearest value of angle of internal friction of the soil in degree choices A.36.88 ̊C.46.88 ̊B.26.88 ̊D.16.88 ̊ ,The nearest value of cohesion of the soil A.36.88 ̊C.46.88 ̊B.26.88 ̊D.16.88 ̊ & Nearest value of P in N if V=124N A.234 NC.342 NB.324 ND.243 Narrow_forwardCan TRIAXIAL TESTS be performed on sand samples? Briefly explain. The results of an undrained triaxial test on a clay soil sample are given in table below Cell Pressure (kN/m2) 200 400 600 Additional Axial Load at Failure (N) 342 388 465 Each sample, originally 76mm long and 38mm in diameter, experienced a vertical deformation of 5.1mm. Evaluate the stress at failure for each cell pressure given in table above. Draw Mohr Circles and determine the shear strength parameters of the soil.arrow_forwardA series of three direct shear tests have been conducted on a certain saturated soil. Each test was performed on a 2.375-inch diameter, 1.0 inch tall sample. The test had been performed slowly enough to produce drained conditions. The results of the tests are as follows: Determine the friction angle and cohesion intercept. Test No. Normal Stress (psf) Shear Stress (psf) 2435 1656 2 4870 3571 3 7305 4578arrow_forward
- In a tri-axial test of silty soil, the sample failed at normal stresses of 521 kPa and a shear stress of 200 kPa. Compute the maximum failure stress. a. 781 kPa b. 510 kPa c. 838 kPa d. 812 kPaarrow_forwardA cohesionless soil sample was subjected to a triaxial test. The sample failed when the minor principle stress was 1200 lbs/ft2 and the deviator stress applied was 3000 lbs/ft2. Find the internal angle of friction of this soil. (answer in degrees)arrow_forward4. The uniaxial compressive strength test is done on a cylindrical rock specimen with diameter of 60 mm and length of 120 mm. The load- deformation diagram of this specimen is shown on the following figure. Determine the uniaxial compressive strength and the secant Young modulus (E50) of this rock. 80000 70000 60000 50000 40000 30000 20000 10000 0.5 1 1.5 Deformation (mm) Load (N) 2.arrow_forward
- A direct shear test, when conducted on a remolded sample of sand, gave the following observations at the time of failure: Normal load = 288 N; shear load = 173 N. The cross-sectional area of the sample = 36 cm2. Determine the angle of internal friction in degrees. a. 29 b. 27 c. 33 d. 31arrow_forwarduse the attached graph paper) A series of direct shear tests was performed on a soil sample. Each test was carried out until the specimen sheared (failed). The laboratory data for the tests are tabulated as follows. Determine the soil's cohesion and angle of internal friction. Specimen Number 1 2 3 4 Normal Stress (kN/m²) 1200 1900 3000 4875 Shearing Stress (kN/m²) 2175 2310 2910 3615arrow_forwardIn a tri-axial test of silty soil, the sample failed at normal stresses of 521 kPa and a shear stress of 200 kPa. 1. Find the angle of internal friction. a. 23° b. 19° c. 21° d. 22° 2. Compute the angle that the failure plane makes with the x-axis a. 55.5° b. 61.6° c. 61.7° d. 45.3° 3. Compute the maximum failure stress. a. 781 kPa b. 510 kPa c. 838 kPa d. 812 kPaarrow_forward
- A series of previous tests has established that the ultimate effective friction angle of a NC clayey soil is 19.2°. If a CD test is now performed on this soil with a cell pressure of 105 kPa, what would be deviator stress at failure? Given: o3 = Kao, where Ka 1-sin o' 1+sin o'arrow_forward: In a tri-axial test of a silty soil, the sample failed at normal stress of 475 kPa and a shear stress of 350 kPa. Which of the following gives the angle of internal friction? Compute the angle that the failure plane makes with the x-axis. Compute the maximum failure stress.arrow_forwardA sample of dry, cohesionless soil has an angle of internal friction of 35°. If the minor principal stress is15 lb/in2, at what values of deviator stress and major principal stress is the sample likely to fail? KINDLY GET THE RIGHT ANSWER WITH EXPLAINATION STEPSarrow_forward
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