$($a$)$ A square concrete pile, size $0\mathrm{.}4$m$,$ is driven to a depth of $8$m in a dry loose sandy soil with the

properties:

c$=0$

$\backslash$phi $=30\backslash$deg

$\backslash$gamma d $=17\mathrm{.}6$ kN$/$m$3$

Calculate the design ground resistance for the pile, Rcd$.$

$($b$)$ A circular steel pile of diameter $0\mathrm{.}3$m is driven to a depth of $6$m in a dense sandy soil with the

following properties:

c$=0$

$\backslash$phi $=35\backslash$deg

$\backslash$gamma d $=18\mathrm{.}6$ kN$/$m$3$

Calculate the design ground resistance for the pile, Rcd$.$

$($c$)$ A square concrete pile, size $0\mathrm{.}35$m$,$ is driven to a depth of $7$m in a dry loose sandy soil with the

properties:

c$=0$

$\backslash$phi $=35\backslash$deg

$\backslash$gamma d $=16\mathrm{.}8$ kN$/$m$3$

Calculate the design ground resistance for the pile, Rcd$.$

If the permanent unfavourable load imposed on the pile by the supported structure is $350$ kN$,$ for

which the partial factor of safety is $\backslash$gamma G $=1\mathrm{.}35,$ is the pile adequate to support the design load, Fcd$?$