Question $1\mathrm{.}4$

The soil profile at a site is shown in Figure $1\mathrm{.}4.$

$($a$)$ Determine the total vertical stresses, pore pressures and effective vertical stresses at points $A$

and $B.$ The unit weight of water at this site is $10k\frac{N}{m^3}.$

$($B: $194,120,74$kPa

Rock

Figure $1\mathrm{.}4$

$($b$)$ A fill layer of $4m$ is to be added to the site. The total unit weights above and below water are

$17$ and $19k\frac{N}{m^3}$ respectively.

$($i$)$ What are the increases in total vertical stress, pore pressure and effective vertical stress

at $"B"$ at the instant of fill placement?

$(44,44,0$kPa$)$

$($ii$)$ What are the final total vertical stress, pore pressure and effective vertical stress long

time at $"$B$"$ long time after the fill placement when all excess pore pressure has been

dissipated?

$(238,120,118$kPa$)$

$($c$)$ If the clay is normally consolidated, what is the future ground settlement due to the $4m$ of fill

stated above. $(C_c=0\mathrm{.}68,C_r=0\mathrm{.}14,e_o=2\mathrm{.}16)$

$($d$)$ If the clay has an average OCR of $1\mathrm{.}2,$ what is the future ground settlement?