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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Chapter 3, Problem 3.16QPP
To determine
The plot of pore water pressure, total vertical pressure, effective total pressure and shear strength on the horizontal plane versus depth.
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Subject: Soil Mechanics
Please provide a solution and a diagram
A granular soil is subjected to a minor principal stress of 200 kN/m2. If the angle of internal friction is 30°. What is the shear stress on the plane of failure?
a. 173.2
b. 224.2
c. 200
d. 300
A site is underlain by a soil that has a unit weight of 18.7 kN/m3above the groundwater table and 19.9 kN/m3below. The groundwater table is located at a depth of 3.5 m below the ground surface. Compute the a) total vertical stress, b) pore water pressure, and c) effective vertical stress at the following depths below the ground surface: 2.2 m (Point A), 4.0 m (Point B), 6.0 m (Point C), d) draw a sketch and show the points( A, B, C) on the sketch.
6. From the given soil profile, the groundwater table is located 2m below the ground level.
(See picture below)
Compute the horizontal effective stress at point A. (Answer: 53.36 kPa)
Compute the lateral effective stress at point A if the lateral earth pressure coefficient at rest is K0=0.50. (Answer: 26.68 kPa)
Compute the lateral total stress at point A. (Answer: 56.11 m)
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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- Subject: soil mechanics I want part b. Please help me with part b. Or can you answer both a and b ? A 10 ft diameter flexible loaded area is subjected to a uniform pressure of 1200 lbs/ft2. a. Plot the variation of the vertical stress increase beneath the center with depth z = 0 to 20 ft. b. In the same plot, show the variation beneath the edge of the loaded area.arrow_forwardA soil profile is shown in Figure Q2 (a). Calculate the total stress, pore waterpressure and effective stress at points A, B, C and D. Hence, plot the variations of thestresses with depth. Given: H1 = 4.7 m H2 = 6.4 m H3 = 3.8 me= 0.55 Ysat= 19.1kN/m3 w= 24%Gs = 2.61 e= 0.64arrow_forwardWhy is the passive soil pressure coefficient greater than 1?arrow_forward
- Figure Q1(c) shows the soil profile with groundwater table is 6 m from thesurface impermeable layer. Calculate the total stress, pore water pressureand effectives tress at points D.arrow_forwardRefer 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_forwardUse the stress-strain curve, where shear stress and strain response are obtained at different vertical effective stresses (100 kPa to 1400 kPa). Determine the Cohesion (c) of the soil in kPa. Hint: Use Mohr Columb Failure criteria. For the above stress-strain graph, Determine the friction angle.arrow_forward
- A soil profile is shown in Figure Q3(b)(i). The groundwater level is located on the ground surface. The sand layer is under artesian pressure where the excess pore water pressure is 40 kN/m^2. (i) Calculate the total vertical stress, pore water pressure and effective vertical stress at the base of each layer. (ii)Determine the increment of the effective stress at the base of sand layer if the 1.5m height fill will be imposed on the ground surface. Note that, the density of the fill material is 1750 kg/m^3. (iii) The excavation will be made in the clay layer for the basement construction. Evaluate the stability of the soil from boiling or quick condition. The depth of the excavation is shown in Figure Q3(b)(ii). (iv)Propose the maximum depth of cut that can be made to avoid boiling or quick condition.arrow_forwardA soil profi le consists of a clay layer underlain by a sandlayer, as shown in Figure P7.17. If a tube is inserted intothe bottom sand layer and the water level rises to 1 mabove the ground surface, determine the vertical effective stresses and porewater pressures at A, B, and C. IfKo is 0.5, determine the lateral effective and lateral totalstresses at A, B, and C. What is the value of the porewater pressure at A to cause the vertical effective stressthere to be zero?arrow_forwardA)Plot graphically all the vertical stresses, pore water and effective vertical stresses throughout the depth. B)How would the effective vertical stress value at the midpoint of the clay layer change if the groundwater level increased 2 m? (g = 10 m / s2)arrow_forward
- Plz give the correct answer. Compute the intensities of active and passive earth pressure at depth of 8 m in dry cohesionless sand with an angle of internal friction of 30 degrees , and unit weight of 18kN / (m ^ 3) What will be the intensities of active and passive pressure if the water level rises to the level? Take the saturated unit weight of sand as 22kN / (m ^ 3) .arrow_forwardThe soil profile at a certain site is as follows:Depth (ft) g (lb/ft3) c′ (lb/ft2) f′ (degree) su (lb/ft2)0–12 119 1,00012–20 126 200 2020–32 129 0 32 The groundwater table is at a depth of 15 ft.Develop plots of pore water pressure, total vertical stress, effective total stress, and shearstrength on a horizontal plane versus depth. All four of these plots should be superimposed onthe same diagram with the parameters on the horizontal axis (increasing to the right) and depthon the vertical axis (increasing downward).Hint: Because the cohesion and friction angle suddenly change at the strata boundaries,the shear strength also may change suddenly at these depths.arrow_forwardDetermine the distribution of the total and effective vertical stress with depth for the soil profile shown.arrow_forward
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