Hello

Please consider the units and all parameters. I have got your answer but you did not count shear strength, pre$-$consolidation pressure in different depth.

QUESTION: A new two$-$span underpass bridge is being proposed on Hwy $401$ and Regional Rd

$10.$ The new bridge will have equal spans of $35$ m and a width of $15$ m to

accommodate two lanes of RR $10$ and sidewalks.

Approach embankments at the bridge abutments are $10$ metres in height tapering

down to $0$ approximately $350$ metres beyond the abutments.

The subsurface conditions at the site consist of a deep deposit of silty clay

approximately $20$ metres in thickness underlain by a thin deposit of a silty sand till

approximately $2$ metres in thickness which in turn is underlain by bedrock. The silty

clay stratum consists of a very stiff desiccated crust approximately $2$ metres in

thickness underlain by a slightly preconsolidated silty clay with a preconsolidation

pressure of approximately $100$ kPa in excess of the overburden pressure for the

upper half and $150$ kPa in the lower half. The shear strength profile consists of $100$

kPa material in the desiccated crust zone to an underlying $30$ kPa zone for the upper

half and $75$ kPa in the lower half.

The groundwater table is at the ground surface.

Your presentation shall the address the following:

$1.$ Bridge Foundation Design

a$.$ Alternatives with a recommended preferred option.

$2.$ Approach Embankment Design

a$.$ Alternatives with a recommended preferred option.

$3.$ Construction Considerations