Principles of Foundation Engineering (MindTap Course List)
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 12.23P
To determine

Find the allowable lateral load Qg at the ground level.

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A 30-m-long concrete pile is 305 mm x 305 mm in cross section and is fully embedded in a sand deposit. If nh = 9200 kN/m2, the moment at ground level, Mg = 0, the allowable displacement of pile head = 12 mm; Ep = 21 x 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 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).
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Principles of Foundation Engineering (MindTap Course List)

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