Question

calculate the depth of the pile and include end bearing capacity (Q_tip). What is the shortest length of pile (rounded to the foot) for your steel pile. Q_all = 20 tons

An 18-in diameter smooth steel pile is driven into dense sand. Find the depth the pile needs to be driven (to the foot) using the following soil profile to achieve a capacity of 20 tons. Factor of Safety 2 K0.75 Water Table@10 D-20x 30 2.0 ALT lon e TABLE 10-5 Coefficient of Friction between Sand and Pile Tan δ 0.45 0.4 0.2 0.4 Use tan φ of sand Wood Steel (smooth) Steel (rough, nasted Steel (corrugated) S+C 1.00 Sauce D. E McCarthy, Essencials of Selil Mechanics and Foundations 4ch ed. p.512, fig. 15-14, 1993. Reprinted by permission of Peanon Education, Upper Saddle Rive, N. 09 ou6 a 0.5 03 1-8-1)mm-1) 02Lower Knows 90man Limit (Varved - posis, Steel oup efficiency "pile arctan d/s,deg n number of piles in a row 3m number of rows of piles d diameter of piles s- spacing of piles, center to center, in same units as pile diameter 260 220 180 24 26 28 30 32 34 36 38 40 42 44 46 Angle of Incenmal Priction Diameters Diameters toe 10S

Answer 1

Pila(sand - Point8 忙 20 x 20 + 125L 125L Oo 2o) - 62-2 (L- lo -62 2L - 622 62-8 L +522 ーク6 Na 62 2 6880-56L + 5子191.91〉 Jb LO 6,모 522 + 62.8L

For Smoott,skel L 20 Auニ (6880.56 L t 5子191.91 〉 t 494 13 4 22-2 L369.05lL 22.2 L2t 2 49.61 L + 5569チ·18 2