1. The pile load test results are shown in the figure below. The length of the pile is 40 m. The diameter of the pile is 0.3 m. The elastic modulus of the material of the pile is 60 GPa. When the loading on the pile head reaches a maximum of 9.78 MN, answer the following questions: (a) What is the load resistance of the pile provided by the end bearing? (b) What is the load resistance of the pile provided by the shaft friction? (c) What is the average side resistance per unit area along the shaft for the upper 20 m of the pile? (d) What is the total capacity of the lower 20 m of the pile? (e) What is the approximate deformation (AL) of the 5 m section between 10-15 m below ground surface? (w) Depth 2 0 5 10 15 20 25 30 2.01 4 13.8 Load, Q(MN) 6 95 5.21 35 4.98 40 4.85 45 5.75 6.33 6.92 00 8 10 12 8.05 9.78 7.87 8.75

1. The pile load test results are shown in the figure below. The length of the pile is 40 m. The diameter of the pile is 0.3 m. The elastic modulus of the material of the pile is 60 GPa. When the loading on the pile head reaches a maximum of 9.78 MN, answer the following questions: (a) What is the load resistance of the pile provided by the end bearing? (b) What is the load resistance of the pile provided by the shaft friction? (c) What is the average side resistance per unit area along the shaft for the upper 20 m of the pile? (d) What is the total capacity of the lower 20 m of the pile? (e) What is the approximate deformation (AL) of the 5 m section between 10-15 m below ground surface? (w) Depth 2 0 5 10 15 20 25 30 2.01 4 13.8 Load, Q(MN) 6 95 5.21 35 4.98 40 4.85 45 5.75 6.33 6.92 00 8 10 12 8.05 9.78 7.87 8.75

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter9: Pile Foundations

Section: Chapter Questions

Problem 9.2P: Refer to the pile shown in Figure P9.1. Estimate the side resistance Qs by Using Eqs. (9.40) through...

See similar textbooks

Similar questions

A steel pile (H-section; HP 360 1.491; see Table 18.1) is driven into a layer of sandstone The length of the pile is 18.9 m. Following are the properties of the sandstone: Unconfined compression strength = qu(lab) = 78.7 MN/m2 Angle of friction = 36 Using a factor of safety of 3, estimate the allowable point load that can be carried by the pile. Use Eq. (18.42).
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.
Determine the maximum load that can be allowed on a 450 mm diameter driven pile shown in Figure P12.6, allowing a factor of safety of 3. Use K = 1.5 Ko and = 0.65 in computing the shaft load. Use Meyerhofs method for computing the point load.
A 20 m long concrete pile is shown in Figure P12.2. Estimate the ultimate point load Qp by a. Meyerhofs method b. Vesics method c. Coyle and Castellos method Use m = 600 in Eq. (12.28).
Figure 18.26a shows a pile. Let L = 20 m, D = 450 mm. Hf = 4m, f = 17.5 kN/m3, fill = 25. Determine the total downward drag force on the pile. Assume that the fill is located above the water table and that = 0.5 fill. FIG. 18.26 Negative skin friction
Determine 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. 18.36
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?
A steel pile (H-section; HP 310 125; see Table 12.1a) is driven into a layer of sandstone. The length of the pile is 25 m. Following are the properties of the sandstone: unconfined compression strength = qu(lab) = 80 MN/m2 and angle of friction = 36. Using a factor of safety of 3, estimate the allowable point load that can be carried by the pile. Use [qu(design) = qu(lab)/5].
Redo Problem 18.10 using the method for estimating the skin resistance. 18.10 A concrete pile 15 m long with a cross section of 380 mm 380 mm is fully embedded in a saturated clay layer. For the clay, sat = 18 kN/m3, = 0, and cu = 80 kN/m2. Assume that the water table lies below the tip of the pile. Determine the allowable load that the pile can carry (FS = 3). Use the a method to estimate the skin resistance.
Determine the maximum load that can be allowed on a 500 mm diameter and 18 m long pile driven into a clay where = 20.0 kN/m3 and cu = 60 kN/m2. Use the a method for determining the skin friction. Allow a factor of safety of 3. What percentage of the ultimate load is being carried by the pile shaft?
Solve Problem 12.23 using the method of Broms. Assume that the pile is flexible and free headed. Let the soil unit weight, = 16 kN/m3; the soil friction angle, = 30; and the yield stress of the pile material. FY = 21 MN/m2. 12.23 A 30 m long concrete pile is 305 mm 305 mm in cross section and is fully embedded in a sand dcposit. If nh = 9200 kN/m2, the moment at ground level Mg = 0, the allowable displacement of pile head = 12 mm; Ep = 21 106 kN/m2, and FY(pile) = 21,000 kN/m2, calculate the allowable lateral load, Qg, at the ground level. Use the elastic solution method.
A 400 mm 400 mm square precast concrete pile of 15 m length is driven into a sand where = 18.0 kN/m3 and = 33. Assuming = 0.7 and K = 1.4Ko, determine the load carrying capacity of the pile with factor of safety of 3.0.