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 14, Problem 14.2P
In a piled raft, 450 mm diameter and 13 m long piles are placed in a rectangular grid at 1.60 m × 1.63 m spacing. Find the pile-raft interaction factor
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A group of piles as shown on the figure has a
cross section of 0.30 m x 0.30 m. It has a total
length of 15 m. The piles are embedded in a
homogeneous saturated clay with Cu = 70
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ground water table is located at a depth of
18 m. below the ground surface. Factor of
safety = 4. Compute the allowable load-
bearing capacity of the group of pile acting as
individual piles.
Qall
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56 m-
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diameter is 250 mm and pile spacing is 0.75 m. The unit cohesion of the material is 18
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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
Chapter 14 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- A 30 m long concrete pile is 305 mm times 350 mm in cross section and is fully embedded in a sand deposit. Using Broms' method, calculate the allowable lateral load Q_g (take FS = 2) at the ground level. Assume the pile is flexible and restrained. Let the soil unit weight, gamma = 16 kN/m^3, the soil friction angle, Phi' = 30^degree; and the yield stress of the pile material, F_y = 21 MPa,arrow_forwardA group of 9 piles, 12 m long and 400 mm in diameter is arranged in a square pattern in homogeneous clay soil. The c/c spacing of the pile are 1000 mm. The properties of clay soil is given below Cc =0.10, e0=0.9, γsat = 20 kN/m^3, unconfined compressive strength qu= 70 kN/m^2 assume adhesion factor 0.7,. Water table is at GL. Determine the FOS against bearing if 1500 kN load is applied on the pile group and total settlement of pile group under the same loadarrow_forwardA square group of 25 piles extends between depths of 2 m and 12 m in a deposit of 20 m thick stiff clay overlying rock. The piles are 0.5 m in diameter and are spaced at 1 m centre to centre in the group. The undrained shear strength of the clay at the pile base level is 180 kPa and the average value of the undrained shear strength over the depth of the pile is 110 kPa. The adhesion coefficient (a) is 0.45, FOS against shear failure is 3. Take No= 9. %3D When pile acting in a group Q,, Capacity of pile grouparrow_forward
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- A group of piles are arranged as shown in the figure. The piles are square in section with sides equal to 400 mm and has a spacing of 1.80 m on centers. One pile has a total length of 18 m. Unit weight of clay is 19.7 kN/m3 and has a cohesion of 90 kPa. Ground water table is located at depth of 20 m below the ground surface. Adhesion factor is 0.90. Determine the ultimate load – bearing capacity of the group of piles considering the piles acting individually.arrow_forwardA nine pile group consists of 0.30m diameter friction concrete piles 12m long. The piles are driven into clay having an unconfined compressive strength of 180kPa and the unit weight of clay is 18kN/m3. The spacing of piles is 0.75m center to center. Assuming a bearing capacity factor of Nc = 9, a= 1.0. Which of the following most nearly gives the minimum pile spacing in order to achieve 100% efficiency?arrow_forwardGive me right solution with clear calculationsarrow_forward
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