Q$1)$

a$)$Find the allowable compression and pull$-$out capacity of a wooden pile with a total

length of $10m$ driven in layers as shown in Fig $1.($F$.$S to be $2)$ Note: any assumption needs to

be supported by a proper reference.

Design for two cases : Pile diameter : $450mm$ and $300mm$

$[35$ marks$]$

Fig$1$

b$)$ Discuss the effect of pile diameter on the above results. Note: key technical terms to be highlighted.

$[5$ marks$]$