LT$-11.$ For a $12-$inch O$.$D$.$ open$-$end steel pipe pile driven to depth of $60ft$ in medium stiff clay, with unit weight $=115pcf$ and undrained shear strength $=1150psf.$ Measurements were made during a load test of the settlement of the top of the pile and the tip of the pile $($see below in table$).$ The steel pile will not be filled with concrete. Assume pipe wall thickness $=\frac{5}{16}$ inch. The groundwater table is $35ft$ below ground surface $.$

Use both the Davidson method and the B$/10$ method to determine the total acceptable ultimate load, based on settlement criteria. Then determine the allowable design load. Compare these ultimate and allowable loads to those based only on capacity calculations $($separate set of calculations needed$).$

Load on Top of Pile $($kips$)$ Settlement of Pile Top$\_($in$.)$ Settlement of Pile Tip$\_($in$.)$

$00\mathrm{.}000\mathrm{.}00$

$270\mathrm{.}060\mathrm{.}01$

$540\mathrm{.}110\mathrm{.}05$

$760\mathrm{.}190\mathrm{.}10$

$1070\mathrm{.}320\mathrm{.}20$

$1520\mathrm{.}570\mathrm{.}40$

$1530\mathrm{.}770\mathrm{.}60$

$1540\mathrm{.}970\mathrm{.}80$

$1551\mathrm{.}181\mathrm{.}00$

$1561\mathrm{.}481\mathrm{.}30$