A 0.45 m square prestressed concrete pile is to be driven at a site of 15 m long where soil conditions are the following: First Clay Layer: L = 9 m; C = 38 KPa; Unit weight = 15.7 kN/m^3; a = 0.90 Second Clay Layer:L = 6 m; C = 106 KPa; Unit weight = 19 kN/m^3; a = 0.55 1. What total skin friction is expected to develop along the embedded length of the pile? 2. Compute the total ed bearing capacity of the pile if Nc = 9. 3. What is the design capacity of the pile if it has a factor of safety of 3.5? 4. What is the required length of the pile if the allowable load is 450 kN at the same soil conditions and factor of safety?

A 0.45 m square prestressed concrete pile is to be driven at a site of 15 m long where soil conditions are the following: First Clay Layer: L = 9 m; C = 38 KPa; Unit weight = 15.7 kN/m^3; a = 0.90 Second Clay Layer:L = 6 m; C = 106 KPa; Unit weight = 19 kN/m^3; a = 0.55 1. What total skin friction is expected to develop along the embedded length of the pile? 2. Compute the total ed bearing capacity of the pile if Nc = 9. 3. What is the design capacity of the pile if it has a factor of safety of 3.5? 4. What is the required length of the pile if the allowable load is 450 kN at the same soil conditions and factor of safety?

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter18: Pile Foundation

Section: Chapter Questions

Problem 18.10P

See similar textbooks

Similar questions

A square prestressed concrete pile with a cross section 0.3 m by 0.3 m is driven 15 m into overconsolidated clays with properties as defined: From the ground surface to a depth of 7 m, the unit weight is 17 kN/m3 and the shear strength cohesion cu is 70 kPa; below 7 m, the soil unit weight is 18.5 kN/m3 and cohesion is 105 kPa. Use the total stress α-method to calculate both the design downward axial capacity and upward axial capacity, using a factor of safety of 3 (downward and upward).
A circular pile having a diameter of 0.35 m is embedded through a layer of 4.5 m thick of clay layer into a dense sand having a bearing capacity factor of 78. Unit weight of clay is 16 kN/m3 and saturated unit weight of sand is 18 kN/m3. Water table is located at the top of the sand layer. Lateral pressure factor of compression K = 1.20 and coefficient of friction of concrete pile is 0.42. The allowable capacity 600 kN. Using a factor of safety of 3. Determine the effective vertical stress at the critical depth.
Problem #1 The figure below shows a cantilever sheet-pile wall penetrating a granular soil. Here, L1 = 4 m, L2 = 8 m, unit weight above water table= 16.1 kN/m3, saturated unit weight = 5 18.2 kN/m3, and friction angle of sand = 32 degrees. a. What is the theoretical depth of embedment, D? b. For a 30% increase in D, what should be the total length of the sheet piles? c. Determine the theoretical maximum moment of the sheet pile. d. If the allowable flexural stress = 170 MPa, compute the required section modulus of the sheet pile.
The tie rods from anchored sheet piles will be connected using a row of anchors, as shown in Figure 18.46a. Here H = 2.0 m, h = 1.25 m, B = 1.5 m, S = 2.5 m, = 32, and = 17.5 kN/m3. The anchor plates are made of 100 mm thick reinforced concrete with a unit weight of 24.0 kN/m3. Determine the ultimate holding capacity of the anchor used Ovesen and Stromanns method.
In Problem 18.4, find the maximum bending moment in the sheet pile and determine the required section modulus, assuming an allowable stress of 190 MN/m2. 18.4 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.
A circular pile 0.45m in diameter and 15m long is embedded in a layer of dense sand. The soil has the following properties: Dry unit eight is 18 kN/m3 and saturated unit weight is 21 kN/m3 (water table is 4m below from the ground surface), Nq=85, k=1.25, tan αα = 0.45 and FS=2.5 a) Calculate the end bearing capacity b) Calculate the frictional resistance c) Calculate the allowable load
A concrete pile 458 mm by 458mm square cross section is embedded in a saturated clay. The length of the embedment is 16 m. The undrained cohesion, Cu of clay is 60 kN/m2, and the unit weight of clay is 18 kN/m2. Use a factor of safety of 5 to determine the allowable load the pile can carry
An excavation 5 m depth is supported by a sheet pile. The sheet pile is extended 3.2 m below the ground and the water table is at the bottom of the pile. Unit weight of soil is 1.91 g/cc. Angle friction is 34°. 1. Which of the following most nearly gives the active force? a. 178.3 kN b. 133.73 kN c. 205.05 kN d. 151.56 kN 2. Which of the following most nearly gives the passive force? a. 274.9 kN b. 308.84 kN c. 339.38 kN d. 397.07 kN 3. Which of the following most nearly gives the passive resistance to mobilize stability? a. 388.2 kN b. 456.7 kN c. 548.04 kN d. 502.37 kN
cantilever sheet pile shown. below, determine: A)the depth of embedment (d). B)the maximum moment.
Consider a 15 m long concrete pile with a cross section of 0.45 m x 0.45 m fully embedded in sand.For the sand, unit weight, γ = 17 kN/m3 and soil friction angle, ϕ’ = 35o. Estimate the ultimate point??? with each of the following:1.1 Meyerhof’s method (Ans: 1014 kN)1.2 Vesic’s method (Ans: 1754 kN)1.3 Coyle and Castello’s method (Ans: 2479 kN)
Determine the ultimate load capacity of a circular pile with diameter D = 20 cm installed in asaturated soft clay. The pile is embedded 10 m into the ground. According to measurements, thesoil exhibits an undrained shear strength according to the linear relationship: Su = 2+1.6z, wherez is the depth in meters and Su is the undrained shear strength in kPa. The soil's unit weight canbe assumed as 18 kN/m3
A 16 in diameter, 55 ft long drilled displacement pile is to be constructed in the following soil profile. Depth (ft) Soil Description Unit Weight (lb/ft3) Undrained Shear Strength (lb/ft2) 0–10 Sandy silt 115 800 10–35 Silty clay 105 4000 35–50 Silty clay 112 1500 50–65 Clay 115 2000 The groundwater table is at a depth of 10 ft. Using a factor of safety of 3.0, determine the ASD allowable downward load capacity.