Geotechnical Engineering

LATERAL EARTH PRESSURE

A $9\mathrm{.}1m$ deep excavation is to be undertaken for an underground car park. The soil profile is shown in the figure below. Please take the ${}_w=9\mathrm{.}81k\frac{N}{m^3}$ and the GWT at a depth of $1\mathrm{.}80m.$

$(30$ marks$)$ Please plot the active earth pressure diagram for the soil.

$(30$ marks$)$ For the soil pressure, compute the resultant active thrust and its location.

$(15$ marks$)$ Please plot the active earth pressure diagram for the water.

$(15$ marks$)$ For the water pressure, compute the resultant active thrust and its location.

$(10$ marks$)$ Compute the combined soil and water resultant active thrust and its location.

Please remember that: