1. A steel pile (H-section; HP 310 3 125; see Table 11.1a) 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 5qu(lab) 5 80 MN/m2 and angle of friction 5 368. Using a factor of safety of 3, estimate the allowable point load that can be carried by the pile. Use [qusdesignd 5 quslabdy5].
2. A concrete pile is 20 m long and has a cross section of 0.46 m 3 0.46 m. The pile is embedded in a sand having g 5 17 kN/m3 and f9 5 388. The allowable working load is 1200 kN. If 700 kN are contributed by the frictional resistance and 500 kN are from the point load, determine the elastic settlement of the pile. Given: Ep 5 2.1 3 106 kN/m2, Es 5 30 3 103 kN/m2, ms 5 0.38, and j 5 0.57 [Eq. (9.81)].