The document provides information about a 21 meter long prestressed concrete pile driven into sand. The pile has an allowable working load of 502 kN, with an octagonal cross-section of 0.356 meters diameter and area of 0.1045 m^2. Skin resistance supports 350 kN of the load and point bearing the rest. The document requests calculating the elastic settlement of the pile given its properties, the load distribution, and soil parameters.

4. The settlement of pile caused by the load at pile point
[Se(2)]

10. The allowable working load on a prestressed
concrete pile 21 m long that has been driven
into sand is 502 kN. The pile is octagonal in
shape with D=0.356 m and Ap= 0.1045 m2,
and perimeter (p)= 1.168m. Skin resistance
carries 350 kN of the allowable load and point
bearing carries the rest. Use Ep=21x106
kN/m2, Es=25x103 kN/m2 µs=0.35 and ξ=0.62.
Determine the elastic settlement of the pile.