(Solved): Problem \#2 Make a set versus pile ultimate capacity curve, and a penetration resistance versus ult ...

Problem \#2 Make a set versus pile ultimate capacity curve, and a penetration resistance versus ultimate capacity curve using the modified Gates formula with the following data: - In the pile driving, hammer weight $${\mathrm{W}}_{\mathrm{r}}=12.45\mathrm{kN}$$, and the rated energy $${\mathrm{E}}_{\mathrm{h}}={\mathrm{W}}_{\mathrm{r}}\mathrm{h}$$ $$=22700$$ to $$30400?27,000$$ N.m. - Pile and other data: 406-mm (16-in.) OD with thickness $${\mathrm{t}}_{\mathrm{w}}=4.8\mathrm{mm}$$, crosssectional area $${\mathrm{A}}_p=0.00602{\mathrm{m}}^2,\mathrm{Ep}=200,000\mathrm{MPa}$$, Pile length $$=18.3\mathrm{m}$$. - Driven open-end but later cleaned and filled with concrete Problem \#3 Friction piles $$12.5\mathrm{m}$$ long and $$0.3\mathrm{m}$$ diameter are to be used for supporting a foundation load of $$2,800\mathrm{kN}$$ which includes the weight of the pile cap (firm contact). Borings at the site indicate a minimum depth of $$35\mathrm{m}$$ of essentially uniform insensitive clay and the standard penetration tests suggest average undrained shear strength of $$50\mathrm{kPa}$$. The unit weight of the soil is $$120\mathrm{lbs}/{\mathrm{ft}}^3$$. Select the number and spacing of piles for the foundation using a factor of safety of $$3.0$$.