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 3.6QPP
The sub-surface profile at a certain site is shown in Figure 3.20. Compute
Figure 3.20
Soil profile for Problem 3.6.
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A soil sample with a layered soil is placed in a tube 3m long. water is allowed to flow in the one end of the soil. The cross-sectional area of the soil sample is 0.1m^2, and the average amount of water collected is 120 cm^2/sec. 25% of the total head loss occurs in soil A, another 25% of the total head loss occurs in soil C.
a). determine the total elevation, and pressure pressure head loss at point 1,2,3 and 4.
b). Determine the hydraulic gradient in the soil B
Refer to the figure. If H1 = 1.94 m, H2 = 2.37 m, h = 1.c m, e =0.49, Gs = 2.67,area of the tank = 0.64 m2, and hydraulic conductivity of the sand (k) = 0.3d cm/sec. What is the upward seepage force per unit volume of soil?
Question 34
A three-layer soil has the following properties:
Layer 1: k = 2.72 x 10^-3 cm/s, H = 3.02 m.
Layer 2: k = 1.7 x 10^-2 cm/s, H = 4.93 m.
Layer 3: k = 3.16 x 10^-3 cm/s, H = 4.04 m.
Determine the equivalent vertical coefficient of permeability of the soil arrangement. Layer 1 is on top of layer 2 while layer 2 is on top of layer 3. Round off to four decimal places.
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 Geotechnical engineering : soil mechanics A layer soil shown has the following data H1= 3m. K1= 2x10^-2 cm/sec H2= 4m K2= 3.2x10^-2 cm/sec H3= 6m K3= 4.1 x 10^ -2 cm/sec Compute the equivalent coefficient of permeability in vertical direction. Compute the velocity if h= 4marrow_forwardThe soil profile at a site consists of a 3-m thick sand layer (moist unit weight = 16.5 kN/m^3, saturated unit weight = 18.5 kN/m^3) underlain by a 6-m thick clay layer (w = 27%, Gs = 2.70, mv = 0.31 MPa^-1, Cv = 2.6 m^3/year), which is underlain by a gravel layer as shown in the figure. A 3 m compacted fill with a unit weight of 20 kN/m^3 is required to be placed at ground level.a) What would be the final consolidation settlement, in mm rounded to the first decimal place?b) How long will it take for 50 mm consolidation settlement, in months rounded to the first decimal place?c) What would be the consolidation settlement in one year, in mm rounded to nearest whole number?arrow_forward44 A three-layer soil has the following properties: Layer 1: k = 2.66 x 10^-3 cm/s, H = 3.42 m. Layer 2: k = 1.77 x 10^-2 cm/s, H = 4.99 m. Layer 3: k = 3.47 x 10^-3 cm/s, H = 4.9 m. Determine the equivalent vertical coefficient of permeability of the soil arrangement. Layer 1 is on top of layer 2 while layer 2 is on top of layer 3. Round off to four decimal places.arrow_forward
- For a falling or variable head permeability test, the following are given: Length of soil specimen = 12 cm. Cross sectional area of stand pipe: A = 0.018 cm2 Diameter of soil specimen = 7.5 cm. Time of collection of water: t = 65 sec. Head difference at time t = 0; h1 = 70 cm. Head difference at time t = 65 sec; h2 = 40 cm. Temperature of water: 14 ֯C Find the absolute permeability of the soil at 20 ֯C.arrow_forwardHow much water will flow through a soil mass in a 5-minute period when the sample length is 150 mm, the cross section is 20 mm by 20 mm, and a constant head of 2 ft is maintained? The soil has a khyd value of 0.1 mm/sec.arrow_forwardA soil sample 10 cm in diameter is placed in a tube 1.2 m long. A constant supply of water is allowed to flow into one end of the soil at A and the outflow at B is collected by a beaker. The average amount of water collected is 2 cm3 for every 10 seconds. Determine the hydraulic gradient Determine the seepage velocity if the void ratio is 0.60 in cm/s. Determine the coefficient of permeability cm/s.arrow_forward
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