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 3.5QPP
A site is underlain by a soil that has a unit weight of
a. 2.2 m
b. 4.0 m
c. 6.0 m
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Students have asked these similar questions
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)
A uniform soil deposit has a dry unit weight of 15.6 kN/m³ and a saturated unit weight of 17.2 kN/m³. The groundwater table is at a distance of 4 m below the ground surface. Point A is at a depth of 6 m below the ground surface. If the water table rises by 3.5 m, determine the change in effective stress at A. Indicate if it is maintained, increased or decreased.
Problem 7:
The soil profile at the site consists of 5.0 m of silty
sand underlain by 13 m of clay. The groundwater
table is at a depth of 2.8 m below the ground surface.
The silty sand has a unit weight of 19 kN/m3 above
the groundwater table and 20 kN/m³ below. The clay
has a unit weight of 15.7 kN/m³. Determine the depth
of groundwater table from the ground surface to have
an average effective stress at the clay layer of 100
kPa?
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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Similar questions
- The soil profile at the site consists of a 5.0 m sand layer underlain by 13 m of clay layer. The groundwater table is at a depth of 2.8 m below the ground surface. The sand has a unit weight of 19 kN/m3 above the groundwater table and 20 kN/m³ below the ground water table. Meanwhile, the saturated unit weight of clay is 15.7 kN/m3. At a depth of 11m from the ground lever, calculate the Total Pressure, Porewater Pressure, and the Effective Pressure (in kPa).arrow_forwardFigure 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_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
- Geotechnicalarrow_forwardSolve the following problems. Provide complete solutions and summary of answers. The water table in soil deposit is 2 meters below the ground surface. The soil above the water table has a dry unit weight of 14.85 kN/cu. Meter. The saturated unit weight of the soil is 20.58 kN/cu.meter. Determine the following: a. Total Stress at a point 4.80 meters below the ground b. Total Pore pressure 4.80 meters below the ground c. Total effective stress at a point 4.80 meters below the ground.arrow_forwardFor the soil profile given below, calculate the vertical effective stress in kPa at depth Z = 8 m. Note that Z = 0 corresponds to the water table level and the ground surface is 2 m below the water table (Z = 2 m). (Acceptable tolerance = 2%).arrow_forward
- Water flows at a rate of 0.09 m3/s upward through a sand sample with a coefficient of permeability of 27 cm/s. The thickness of the soil is 0.24 m and the area is 0.54 sq. m. Saturated unit weight is 18.9 kN/m3. a) Determine the hydraulic gradient (Ans. 0.617) b) Compute the effective stress at the middle of the sample (Ans. 354 N/m2) c) Compute the effective stress at the bottom of the sample. (Ans. 728 N/m2)arrow_forwardThe soil profile consists of 5m sand underlain by 13 m layer of clay. The ground water table is at a depth 2.8 m below the surface. The sand has a unit weight of 19 kN per cu. Meter above the ground water table and the saturated unit weight below was 20 kN per cu. meter. The saturated unit weight of the clay is 15.7 kN per cu. meter. At a depth of 11 m determine the following:a. Total stressb. Pore water pressurec. Effective stress.....arrow_forwardQuestion 1: (10) For the soil profile shown below where H1 = 5 m and H2 = 5 m: a) Calculate the total stress (o), pore water pressure (u), and effective stress (o') at point A. b) In order to decrease the effective stress at point A by 15 kN/m2, what would be the depth of the water table from the ground surface. XXXX H1 Dry Sand e = 0.60 G, = 2.68 Clay H2 e 0.80 G = 2.75 %3D %23arrow_forward
- 13. Water flows the rate of 0.09 m³/s in an upward direction through a sand sample with a coefficient of permeability of 27 cm/s. The thickness of the soil sample is 0.24 m. and the area of cross section is 0.54 m². Saturated unit weight of sand is 18.9 kN/m³. a) Compute the hydraulic gradient, b) Compute the effective stress at the middle of the sample. c) Compute the effective stress at the bottom of the sample.arrow_forwardEffective Stress in Soil Problem 1. The water table in a certain deposit of soil is at a depth of 2m below the ground surface. The soil consists of clay up to depth of 4m from the ground and below which lies sand. The clay soil is saturated even above the water table: Clay strata: ? = 30%,?? = 2.72 Sandy Strata: ? = 26%, ?? = 2.64 1. Compute the total pressure. 2. Compute the pore water pressure. 3. Compute the effective stress pressure at a depth of 8m below the ground surfacearrow_forwardA soil has the following profile with depth: 0 - 17.5 ft γt=125 pcf 17.5 - 40 ft γsat=105 pcf 40 - 60 ft γsat=120 pcf The water table is at a depth of 17.5 ft. Plot the total stress, effective stresses, and pore pressure versus depth. Show all of your calculations. Assume that there is no capillarity.arrow_forward
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