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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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.
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 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.
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
- Determine the effective stress in kPa at a depth of 16 m below the ground level for the following conditions: Water table is 3 m below ground level ; G = 2.68; e = 0.72;average water content of the soil above water table is 8% a.127.5 b.301.6 c.429.1 d.174.1arrow_forwardProblem 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?arrow_forwardThe 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_forward
- Ground surface 2. The soil profile for a proposed construction site is shown. The groundwater table is located 2 m below the ground surface. Assume geostatic conditions and ignore any negative pore-water pressures due to capillary rise. Yt = 13.2 kN/m 2. Sand Ysat =? G, = 2.70 n= 0.5 (a) What is the effective stress (kPa) at point A? (Ans: 43 kPa) (b) What is the effective stress (kPa) at point B? (Ans: 82 kPa) (c) Ten years from now, the depth of the groundwater table will change, resulting in a new effective stress at point B of 72.6 kPa. Based on this information, how far below the ground surface will the new location of the groundwater table be? (Ans: 0 m; GWT is at the ground surface) A Clay Ysat = 19.6 kN/marrow_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_forward5. A soil profile at a site consists of a 10-foot thick layer of sand over a thick clay layer. The water table is located at the bottom of the sand layer. The moist unit weight of the sand is 100 pcf and the saturated unit weight of the clay 115 pcf. Calculate the total vertical stress, pore water pressure, and vertical effective stress at a depth of 15 feet below the ground surface. 6. The subsurface conditions at a site consist of a 4-meter thick layer of clay over bedrock. The water table is located at the ground surface. The total (saturated) unit weight of the soil is 15 kN/m³. A consolidation test is performed on an undisturbed sample of the clay obtained from the midpoint of the clay layer (i.e., 2 meters below the mudline) and the 'e-log-p curve' is shown in the figure below. (a) Using Casagrande's construction procedure estimate the preconsolidation stress. (b) Assess the stress history of the sample (i.e., normally consolidated or overconsolidated). (c) Determine the…arrow_forward
- Consider the soil profile shown in the figure below, and an initial groundwater depth of 5 feet below the ground surface. Assuming the soil above the water table is dry, then Ground Surface Ya = 115 Ib/ft G.= 2.65 5 ft SAND 15 ft Ysat = 120 Ib/ft3 e,- 1.1 C = 0.5 C, = 0.05 o- 2.8 ksf 15 ft CLAY ROCK a. The in-situ effective vertical stress in the middle of the clay layer is psf. b. If a uniform permanent load of 500 psf is applied on the ground surface, the estimated primary consolidation settlement of the clay layer is inches. c. If the groundwater table is lowered to the top of the clay layer at a final depth of 20 feet below the ground surface after the consolidation settlement in part (b) is completed, the effective vertical stress increase in the middle of the clay layer is psf.arrow_forwardWater 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_forward
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