Can u plz help to explan step by step and ans

problems#$4-5$

roblem #$4$

A bored pile of $0\mathrm{.}8$ m in diameter is constructed in sand. Soil conditions and relevant soil parameters are shown in the figure. Determine the allowable pile load capacity, assuming a factor of safety of $3$ and using Berezantzev's bearing capacity factors, for the following groundwater conditions:

$($a$)$ the groundwater table is well below the pile point, and

$($b$)$ the groundwater table is at a depth of $3$ m below the ground surface.

Pile in clay

Problem # $5$

A driven pipe pile in clay is shown in the figure. The pile has an outside diameter of $406$ mm and a wall thickness of $6\mathrm{.}35$ mm $.$ Relevant soil parameters are shown in figure.

$($a$)$ Calculate the net point beating capacity.

$($b$)$ Calculate the skin resistance by the $$ method

$($c$)$ Estimate the net allowable pile load capacity, using a factor of safety of $4.$