Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 12, Problem 12.17P
To determine
Find the ultimate side skin resistance.
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The average values of the undrained shear strength (cu) with depth are given below. If a CFA pile having a diameter of 0.6 m and length of 10 m is to be constructed in this clayey soil, estimate the ultimate side skin resistance Qs.
A group pile has a section of 4 x 4 with each having a diameter of 305 mm are
embedded in clay. The length of the piles are 12 m and the spacing between the piles
(d) are 1.0 m. The recorded soil profile for the ground is shown in Table 1. Propose the
allowable load bearing capacity of the pile with a factor of safety of (FS) of 3.
(b)
TABLE 1: Soil type and soil parameter
Depth
Soil parameter
Unit weight = 17.5 kN/m³
= 20 kN/m2
0.0 m to 2.0 m
Cohesion
%3D
2.0 m to 8.0 m
Unit weight = 18.5 kN/m³
%3D
Cohesion
= 60 kN/m?
8.0 m to 15.0 m Unit weight= 20.1 kN/m³
%3D
Cohesion
= 80 kN/m2
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.
f N/mm2
Cross section
Chapter 12 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 12 - Prob. 12.1PCh. 12 - A 20 m long concrete pile is shown in Figure...Ch. 12 - A 500 mm diameter are 20 m long concrete pile is...Ch. 12 - Redo Problem 12.3 using Coyle and Castellos...Ch. 12 - A 400 mm 400 mm square precast concrete pile of...Ch. 12 - Determine the maximum load that can be allowed on...Ch. 12 - A driven closed-ended pile, circular in cross...Ch. 12 - Consider a 500 mm diameter pile having a length of...Ch. 12 - Determine the maximum load that can be allowed on...Ch. 12 - Prob. 12.10P
Ch. 12 - Prob. 12.11PCh. 12 - Prob. 12.12PCh. 12 - A concrete pile 16 in. 16 in. in cross section is...Ch. 12 - Prob. 12.14PCh. 12 - Solve Problem 12.13 using Eqs. (12.59) and...Ch. 12 - Prob. 12.16PCh. 12 - Prob. 12.17PCh. 12 - A steel pile (H-section; HP 310 125; see Table...Ch. 12 - Prob. 12.19PCh. 12 - A 600 mm diameter and 25 m long driven concrete...Ch. 12 - Redo Problem 12.20 using Vesics method, assuming...Ch. 12 - Prob. 12.22PCh. 12 - Prob. 12.23PCh. 12 - Solve Problem 12.23 using the method of Broms....Ch. 12 - Prob. 12.25PCh. 12 - Solve Problem 12.25 using the modified EN formula....Ch. 12 - Solve Problem 12.25 using the modified Danish...Ch. 12 - Prob. 12.28PCh. 12 - Prob. 12.29PCh. 12 - Figure 12.49a shows a pile. Let L = 15 m, D (pile...Ch. 12 - Redo Problem 12.30 assuming that the water table...Ch. 12 - Refer to Figure 12.49b. Let L = 18 m, fill = 17...Ch. 12 - Estimate the group efficiency of a 4 6 pile...Ch. 12 - The plan of a group pile is shown in Figure...Ch. 12 - Prob. 12.35PCh. 12 - Figure P12.36 shows a 3 5 pile group consisting...Ch. 12 - Prob. 12.37P
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- A frictional pile with a circular cross-section (diameter = D) is pushed into the soil %3D 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 xx f N/mm2arrow_forwardb) 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.arrow_forwardConsider 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_forward
- Refer 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 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_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
- 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.arrow_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. P L Cross sectionarrow_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_forward
- A concrete pile of size 50 cm x 50 cm is to be provided in a clay stratum whose unconfined compressive strength is 110 kPa. Compute the minimum length of pile required to carry safe working load of 450 kN with a factor of safety 2.5. Assume adhesion factor as 0.6.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, 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_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
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