QUESTION $5$

$($a$)$ A ground anchor in dense sand has a fixed anchor length, L$,$ of $2m$ and an effective fixed anchor diameter, D$,$ of $200mm,$ as shown in Figure $4$ below. The diameter of the borehole, $d,$ is $100mm.$ The sand has unit weight $20k\frac{N}{m^3}$ and friction angle $33($assume no cohesion$).$ The anchor is inclined at $20$ to the horizontal and the depth to the base of the fixed end is $1\mathrm{.}8m$ from ground level. Calculate the anchor pull$-$out resistance using a partial factor of $1\mathrm{.}1.$ Assume the friction and bearing coefficients A and $B$ equal to $1\mathrm{.}5$ and $40,$ respectively.

$(15$ marks$)$

Figure $4$

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