EBK FOUNDATION DESIGN
3rd Edition
ISBN: 9780133424478
Author: CODUTO
Publisher: YUZU
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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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The diagram below shows a multi-layered soil, write an expression for the stress at each layer and the vertical total stress at depth z. (all symbols have their usual meaning)
7. Figure 2 shows the Total Stress and Effective Stress Diagram of a soil profile
Effective Stress (kN/m²)
Total Stress (kN/m²)
100
100
Depth (m)
1
2
7
8
9
10
50
42
56
86
150
200
Depth (m)
1
2
3
4
7
8
9
10
50
42
56
66
94
150
200
154
Figure 2. Total stress and effective stress diagram
a. Based on the diagram, what is the elevation of the groundwater table?
b. If the unit weight of water is 10 kN/m^3, what is the unit weight of the saturated layer
between 4 and 6 m deep?
c. What are the impacts of rising and falling groundwater levels? Explain your answer and
give some examples.
The ground conditions at a site are shown in the figure below.
GL
/XX
5 m
.. P
Sand
V
xx =
^x
Water table is at ground level
Water content
20%
Specific gravity of solids = 2.7
Unit weight of water
= 10 kN/m²
The total stress, pore water pressure and effective stress (kN/m³) at the point P are, respectively
Chapter 3 Solutions
EBK FOUNDATION DESIGN
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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- Problem 2 Plot the stress profile for total stress, effective stress and pore water pressure. Show all calculation. A Dry sand 0.61 G=266 Saturated sand. e=0,48 G=267 Clayarrow_forward(a) Explain the principle of effective stress and its importance in geotechnical engineering. (b) For the soil mass shown in the figure, determine the equation for the effective stress at point A. The unit weight of the soil above the ground water table is yand below is ysat. (c) The water table is located at a depth of 3.0 m below the ground surface in a deposit of sand 11.0 m thick. The sand is saturated above the water table. The saturated unit weight of the sand is 20 kN/m³. Consider the unit weight of water as 9.81 kN/m³. Calculate the (a) the total stress, (b) the pore water pressure and (c) the effective stress at depths 0, 3, 7, and 11 m from the ground surface, and draw the pressure distribution diagram.arrow_forwardA dilatometer test was conducted in a clay deposit. The groundwater table was locatedat a depth of 3 m below the surface. At a depth of 8 m below the surface, the contact pressure spod was 280 kN/m2 and the expansion stress sp1d was 350 kN/m2. Determinethe following:a. Coefficient of at-rest earth pressure, Kob. Overconsolidation ratio, OCRc. Modulus of elasticity, EsAssume s 9o at a depth of 8 m to be 95 kN/m2 and ms 5 0.35.arrow_forward
- A soil profile is shown in figure below. Calculate the following:a. Effective stress at point A in kPa.b. Effective stress at point B in kPa.c. Effective stress at point C in kPa.arrow_forwardGiven the soil profile below, determine the Total Stress, Neutral Stress and Effective Stress at points A, B, C, and D. Plot as well the soil pressure diagram. H1= 1.9m H2=0.95m H3=1.9m Please answer this asap. For upvote. Thank you very mucharrow_forward7. A soil profile consisting of three layers is shown in the figure. Calculate the values of the total stress, effective stress ad pore water pressure at points A, B, C, and D for the following cases. In each case, plot the variations with depth. Characteristics of layers 1, 2, and 3 for each case are given below: Page 3 of 4 Layer 1 Groundwater table Layer 2 Layer 3 Dry sand Sand Clay Rock Layer no. Thickness Soil parameters 1 Y = 110 lb/ft³ 121 Ib/ft H = 7 ft 2 %3D Yat = 3 H, = 6 ft Yeat = 118 lb/ft³ e = 0.7; G, = 2.69 e = 0.55; G, = 2.7 w = 38%;e = 1.2 %3D 1 H = 5 m II, = 8 m %3D 3 H, = 3 m 1 H, = 3 m Y = 16 kN/m 18 kN/m 2 H¸ = 6 m Yat 3 H, = 2.5 m 17 kN/m %3D Ysat %3D 2.arrow_forward
- Q-2 For the soil profile shown in the figure below calculate and plot the total stress, pore water pressure and effective stress at points A, B, C and D. Give the following Data :arrow_forwardGiven the soil profile below, determine the Total Stress, Neutral Stress and Effective Stress at points A, B, C, and D . Plot as well the soil pressure diagram. H1= 1.9m; H2=0.95m; H3=1.9marrow_forwardA square footing supporting a column applies a uniform pressure of 100 kPa on top of a deep clay deposit. Based on the bulbs of pressure developed below the footing shown in the following figure, which of the following statements are correct (select all that apply)? A.Immediately after construction, the effective vertical stress developed at Points B and C is the same. B.Immediately after construction, the excess pore water pressure (∆u) developed at Point B is lower than ∆u developed at Point A. C.After construction, the excess pore water pressure at Point C dissipates faster than that dissipated at Point B. D.arrow_forward
- 1.A dry sand is known to have an angle of internal friction of 29. A triaxial test is planned, where the confining pressure will be 41 kPa. What is the maximum axial stress, in kPa, (major principal stress) that can be applied? Calculate the value to 1 decimal place. Do not provide units in your answer. 2.A clay soil is subjected to a triaxial test under unconsolidated-undrained conditions. At failure, the major and minor principal stresses are 8401 psf and 4875 psf, respectively. What is the shear strength of this soil if the confining pressure is doubled? Provide your answer in psf with no decimals.arrow_forward6. A cylindrical sample of soil is iso-tropically compressed at 150 KPa under drained condition. Subsequently, the axial stress was held constant and the radial stress was increased to 300 kPa under an undrained condition. (a) Calculate the initial mean effective stress and deviatoric stress. Create a graph with the x-axis as p, p' and the y-axis as q (p, q space). Plot these values in (p, ) space. (b) Calculate the increase in mean total stress and deviatoric stress. (c) Plot the total and effective stress paths (assume the soil is a linear, isotropic, elastic material). (d) Determine the slopes of the total and effective stress paths and the maximum excess porewater pressure for each space.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_forward
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