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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Q-1: A soil profile consisting of three layers is shown in the following figure.
a) Calculate the values of o, u and o' at points A, B, C, and D
Layer no.
1
2
3
↑
H₁
H₂
H₂
Thickness
H, = 2.1 m
H₂ = 3.66 m
H₂ = 1.83 m
Dry sand
Soll parameters
Y₁ = 17.23 kN/m³
Ysat
18.96 kN/m³
Ysat
18.5 kN/m³
Sand Clay Rock
Layer 1
Groundwater table
Layer 2
Layer 3
ⒸDengage Learning 2014
b) Calculate the effective stress at c when water table drops by 2m (consider x 16.5 for layer 2).
c) Calculate the effective stress at c when water table rises by 2m above layer 1 due to flooding
(consider Ysa 18.5 for layer 1).
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
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= 4m
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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- Consider the soil detail and profile are shown in the Table 1.1 and Figure 1.2. Table 1.1 Layer No. Thickness, H Soil Parameters e = 0.52, Gs = 2.62 e = 0.52, Gs = 2.65 w = 20%, e = 0.50 1 4.8 m 2 2.5 m 3 2.2 m Layer 1 H2 Layer 2 C. Layer 3 Figure 1.2 O Dry sand Sand D Clay Rock If groundwater table is x = 0.25 m above point B (use yw = 9.81 kN/m3), determine: a. The effective stress at point D. b. If the effective stress at point D is lowered by 10 kPa, what is the new elevation (new x) of groundwater table measured from point B?arrow_forwardA soil profile is shown in Figure 6.24. Calculate the values of o, u, and o at points A, B, C, and D. Plot the variation of ơ, u, and ơ with depth. We are given the values in the table. Layer No. Thickness (m) Unit weight (kN/m³) H = 2 H2 = 3 = 7 I Ydry = 15 Ysat = 17.8 II %3D III %3D Ysat = 18.6arrow_forwardThe soil sample in a tri axial test have the following stresses Cell pressure 25 Кра 34 Кра Pore stress Deviator stress 20 Кра 31 Кра 12 Кра 10 Кра a) Calculate the drained angle of internal friction b) Find the cohesion of soil c) What is the angle of failure in shear?arrow_forward
- Q-C Refer to the soil profile shown in Fig. Q-c (page 2). Calculate and plot o, u and o' with depth.arrow_forward9.1 Through 9.3 A soil profile consisting of three layers is shown in Figure 9.25. Calculate the values of ơ, u, and o' at points A, B, C, and D for the following cases. In each case, plot the variations of ơ, u, and o' with depth. Characteristics of layers 1, 2, and 3 for each case are given below: H Layer I Groundwater table H2 Layer 2 Layer 3 | Dry sand Sand a Clay Rock Figure 9.25 Layer no. Thickness Soll parameters H; = 2.1 m Hz = 3.66 m - 1.83 m Ye = 17.23 kN/m 18.96 kN/m 18.5 kN/m 9.1 Yut 3 H3 Yautarrow_forward2) A soil profile consisting of three layers is shown in the Figure. A) Calculate the values of σ, u and σ' at points A,B,C and D if Layer 1: H1=5m, e=0.7, Gs=2.69 Layer 2: H2=8m, e=0.55, Gs=2.7 Layer 3: H3=3m, w=38%, e=1.2 B) What is the change in effective stress at point C if: If the water table drops by 2m? If the water table rises to the surface up to point A? Water level rises 3 m above point A due to flooding?arrow_forward
- 22. A sample of moist soil has a water content of 26%, a void ratio of 1.1, and a Gs of 2.7 a. Draw the phase diagram and fill it in with numerical values b. Determine S, n, yd, Ysat, Ysubarrow_forwardQ2. A soil profile consisting of three layers is shown in Figure 1 below. Unit weight of water (yw) = 9.81 kN/m³ Layer no. 1 2 3 ↑ H₁ H₂ Dry sand Sand Clay Rock Figure 1: Soil Profile Thickness H₁ = 1.5 m H₂ = 2.53 m H3 = 2.64 m Layer 1 Groundwater table Layer 2 Layer 3 Soil parameters Yd = 16.5 kN/m³, Ysat = 17.42 kN/m³ Ya = 16.5 kN/m³, Ysat = 18.55 kN/m³ Yd = 17.50 kN/m³, Ysat = 19.23 kN/m³ a) Calculate the values of o, u and o' at points A, B, C and D. b) Calculate the effective stress at C when water table drops by 2 m. c) Calculate the effective stress at C when water table rises by 1 m above layer 1 due to flooding.arrow_forward.In the given soil profile detemine the 6,µ and 6' of the points A,B.C and D. Show the variations in a diagram, Considering NO seepage. H1 = 4.0 m e = 0.4 H1 Layer 1 Gs = 2.65 Ground water H2 = 5.0 m e= 0.6 H2 Layer 2 Gs = 2.68 H3 = 3.0 m H3 Layer 3 e = 0.81, Gs = 2.73 %3Darrow_forward
- A soil sample has a unit weight of 1.9 g/cc and w=12%. If Gs of solids is 2.65, determine the void ratio in percent. CHOICES: a.56.8 b.1.7 c.36 d.56arrow_forwardA soil profile is shown in Figure P3.3 along with the stan- dard penetration numbers in the clay layer. Use Eqs. (3.8b) and (3.9) to determine the variation of c, and OCR with depth. What is the average value of c, and OCR? Dry sand y = 16.5 kN/m² 1.5 m Groundwater table Sand 1.5 m Ysat = 19 kN/m³ N60 1.5 m • 8 Clay Ysat = 16.8 kN/m³ 1.5 m A • 8 1.5 m 9 1.5 m 10 Sandarrow_forward9.1 Through 9.3 A soil profile consisting of three layers is shown in Figure 9.25. Calculate the values of o, u, and o' at points A, B, C, and D for the following cases. In each case, plot the variations of o,u,and o' with depth. Characteristics of layers 1,2, and 3 for each case are given below: Layer 1 Groundwater table Layer 2 Layer 3 O Dry sand Clay Sand Rock Figure 9.25 Problem Layer no. Thickness Soil parameters 9.1 1 H - 7 ft - 110 Ib'fn 2 H = 12 ft Y- 121 Ib'ft H, = 6 ft Y = 118 Ib/f3 H =5m P= 0G, = 2 64 H, = 8 m e = 0.55: G, = 2.7 H, = 3 m w = 38%; e = 1.2 9.3 1 H - 3 m Y- 16 kNim 2 H. - 6 m Yu - 18 kN'm 3 H, - 2.5 m Yut - 17 kN/marrow_forward
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