GEE$2601$ Assessment $1\_2024$

Movement of water through soils

$[30$ Marks$]$

A dam section is shown in figure Q$1.$ The hydraulic conductivity of the permeable layer is $3\mathrm{.}9{10}^{-4}\frac{m}{s}.$

Figure Q$1$

a$)$ Print and construct a flow net, do not redraw the sketch.

$(10)$

b$)$ Calculate the flow rate.

$(5)$

c$)$ How would water rise above the ground level if a piezometer is placed at point $"$A$"$ on the base of the dam?

$(5)$

d$)$ What will the seepage pressure be if a piezometer is placed at point $"A^{?}$

$(5)$

e$)$ What will the Uplift pressure be if a piezometer is placed at point $"$A$"$

$(5)$

$1$

GEE$2601$ Assessment $1\_2024$

Soil compaction

$[10$ Marks$]$

The results of a standard proctor test are given in the following table. Determine the maximum dry density $(k\frac{g}{m}3)$ of compaction and optimum moisture content.

$\backslash$table$[[\backslash$table$[[$Volume of proctor mold$],[($cm$3)]],\backslash$table$[[$Weigh t of wet soil in the$],[$mold $($N$)]],$Moisture content $(\%)],[943,14,5,8,4],[943,18,46,10,2],[943,20,77,12,3],[943,17,88,14,6],[943,16,15,16,8]]$

Stress in soil mass $[20$ Marks$]$

A soil profile shown in Figure Q$3$ has three different soil layers. Where:

Gs $=$ Specific gravity, $e=$ Void ratio, $WT=$ Water table, $W=$ Moisture content, and $S=$ Degree of saturation

Figure Q$3($Soil Profile$)$

$1\mathrm{.}1$ Determine the total stress, effective stress and pore water pressure at point $A$

B$,$ C and D in figure Q$1($Soil Profile$)$

$(20)$

TOTAL $=60$ Marks

unisaC$2024$