Principles of Foundation Engineering, SI Edition
8th Edition
ISBN: 9781305723351
Author: Braja M. Das
Publisher: Cengage Learning US
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Chapter 9, Problem 9.14P
To determine
Find the ultimate side skin resistance.
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b) A pre-cast concrete pile of size 310 mm x 310 mm and 16 m length is to be drilled in
a stiff clay deposit. The undrained cohesion of the soil along the embedment of the
pile is shown in Table 1. Determine the allowable load on the pile using the factor of
safety as 2.0. Assume the adhesion factor along the pile is 0.4.
Steel pipe piles are to be used as friction piles (i.e., pile capacity is from shaft resistance only) in an area where a deep deposit of normally consolidated clay exists. The soil unit weight is 17kN/m3, with shear strength cohesion cu equal to 45 kPa. Using the total stress α-method, determine the design axial capacity due to shaft resistance for a pile diameter of 0.30 m and an embedded length of 10 m. Apply a factor of safety of 2.75.
A frictional pile with a circular cross-section
(diameter D) is pushed into the soil to a distance
(L) and then it is subjected to an axial force (P) on
its top end. Derive a formula to calculate the
normal stress in any section x.
P
fN,
D
Cross section
Chapter 9 Solutions
Principles of Foundation Engineering, SI Edition
Ch. 9 - A 20 m long concrete pile is shown in Figure...Ch. 9 - Refer to the pile shown in Figure P9.1. Estimate...Ch. 9 - Prob. 9.3PCh. 9 - A driven closed-ended pile, circular in cross...Ch. 9 - Prob. 9.5PCh. 9 - Prob. 9.6PCh. 9 - Prob. 9.7PCh. 9 - Prob. 9.8PCh. 9 - Prob. 9.9PCh. 9 - A concrete pile 16 in. 16 in. in cross section is...
Ch. 9 - Prob. 9.11PCh. 9 - Solve Problem 12.13 using Eqs. (12.59) and...Ch. 9 - Prob. 9.13PCh. 9 - Prob. 9.14PCh. 9 - A steel pile (H-section; HP 310 125; see Table...Ch. 9 - A concrete pile is 20 m long and has a cross...Ch. 9 - Prob. 9.17PCh. 9 - Prob. 9.18PCh. 9 - Solve Problem 12.23 using the method of Broms....Ch. 9 - Prob. 9.20PCh. 9 - Solve Problem 12.25 using the modified EN formula....Ch. 9 - Solve Problem 12.25 using the modified Danish...Ch. 9 - Figure 12.49a shows a pile. Let L = 15 m, D (pile...Ch. 9 - Redo Problem 12.30 assuming that the water table...Ch. 9 - Refer to Figure 12.49b. Let L = 18 m, fill = 17...Ch. 9 - A concrete pile measuring 16 in. × 16 in. in cross...Ch. 9 - The plan of a group pile is shown in Figure...Ch. 9 - Prob. 9.28PCh. 9 - The section of a 4 × 4 group pile in a layered...Ch. 9 - Prob. 9.30P
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- Consider a 500 mm diameter pile having a length of 18 m in a clay. Given: γ = 20.0 kN/m3 and cu = 60 kN/m2. Determine the maximum allowable load (Qall) with FS = 3. Use the α method and Table 12.11 for determining the skin friction and Eq. (12.20) for determining the point load. Allow a factor of safety of 3. What percentage of the ultimate load is being carried by the pile shaft? Is it a friction pile?arrow_forwardRefer to Figure 18.13. Given L1 = 1.5 m, L2 = 3 m; for the sand, =33, =16.5kN/m3, sat=19.0kN/m3; and, for the clay, c=50kN/m2, =0, sat=20kN/m3. Determine the depth of sheet pile required, allowing for a 50% increase from the theoretical estimate.arrow_forwardDetermine the maximum load that can be allowed on the 450 mm diameter pile shown in Figure 18.36, with a safety factor of 3. Use the a method for computing the shaft friction. FIG. 18.36arrow_forward
- Determine the maximum load that can be allowed on the 450 mm diameter pile shown in Figure P12.9, with a factor of safety of 3. Use the α method and Table 12.11 for determining the skin friction and Eq. (12.20) for determining the point load.arrow_forwardQ- Find the total load carrying capacity of a group of 9 piles with a group efficiency factor of 0.9. Given that the load carrying capacity of an individual friction pile is 200 kN.arrow_forwardA rectangular pile (0.91 x 0.54 m.) is driven in a clayey soil arrangement composed of two different layers. First layer has a height of 5 m., cohesion of 51 kPa, friction factor of 0.82. Second layer has a height of 5 m., cohesion of 71 kPa, and friction factor of 0.84. Compute the allowable load that the pile can carry if the factor of safety is 2.97arrow_forward
- A rectangular pile (0.88 x 0.68 m.) is driven in a clayey soil arrangement composed of two different layers. First layer has a height of 5 m., cohesion of 54 kPa, friction factor of 0.81. Second layer has a height of 8 m.., cohesion of 72 kPa, and friction factor of 0.81. Compute the allowable load that the pile can carry if the factor of safety is 2.93. Round off to two decimal places.arrow_forwardCheck the total settlement of a group of pile as shown in Figure 1. The total allowable settlement is set not exceed 3% of the pile diameter and the overconsolidated ratio (OCR) of the clay is more than 1. The groundwater table is located 15m beneath the ground level. The diameter of the pile, b is 0.5m and the spacing between piles, s is 2m.The pile group is subjected to foundation load of 5425KN. The laboratory testing data for the soil samples taken are as follows: At 5m, eo = 0.55, Cc = 0.32, C; = 0.09, ơ'o = 150kN/m? At 10m, eo = 0.55, Cc = 0.32, Cs = 0.09, o'o = 225KN/m? At 12m, eo = 0.55, Cc = 0.32, Cs = 0.09, o'o = 300KN/m? 7m 5m Clay 3 10m Unit weight = 18KN/m Friction angle = 0 degree 2 Cohesion = 100KN/m Figure 1: Pile systemarrow_forwardCheck the total settlement of a group of pile as shown in Figure 1. The total allowable settlement is set not exceed 3% of the pile diameter and the overconsolidated ratio (OCR) of the clay is more than 1. The groundwater table is located 15m beneath the ground level. The diameter of the pile, b is 0.5m and the spacing between piles, s is 2m.The pile group is subjected to foundation load of 5425KN. The laboratory testing data for the soil samples taken are as follows: At 5m, eo = 0.55, Cc = 0.32, C, = 0.09, ơ'o = 150KN/m? At 10m, eo = 0.55, Cc = 0.32, C; = 0.09, o'o = 225KN/m? At 12m, e, = 0.55, Cc = 0.32, C, = 0.09, oo = 300KN/m? 7m 5m Clay 10m Unit weight = 18kN/m Friction angle = 0 degree Cohesion = 100KN/marrow_forward
- Check the total settlement of a group of pile as shown in Figure 1. The total allowable settlement is set not exceed 3% of the pile diameter and the overconsolidated ratio (OCR) of the clay is more than 1. The groundwater table is located 15m beneath the ground level. The diameter of the pile, b is 0.5m and the spacing between piles, s is 2m.The pile group is subjected to foundation load of 5425kN. The laboratory testing data for the soil samples taken are as follows: At 5m, eo = 0.55, Cc = 0.32, C; = 0.09, o'o = 150kN/m? At 10m, eo = 0.55, Cc = 0.32, Cs = 0.09, o'o = 225kN/m2 %3D At 12m, eo = 0.55, Cc = 0.32, C; = 0.09, o'o = 300KN/m2 %3D 7m 5m Clay 3 10m Unit weight = 18KN/m %3D Friction angle = 0 degree 2 Cohesion = 100KN/marrow_forwardA frictional pile with a circular cross-section (diameter = D) is pushed into the soil to a distance (L) and then it is subjected to an axial force (P) on its top end. Derive a formula to calculate the normal stress in any section x.arrow_forward. A cast-in-situ bored pile 0.50 m diameter and 10 m deep is placed in a purely cohesive soil. If the cohesion of the soil is 4t/m2 and adhesion between the pile and the soil is half the value of cohesion, then the ultimate bearing capacity of the pile is given byarrow_forward
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