Question

Civil Engineering
The width of the working area is 12m and the length in the perpendicular direction will be much
greater than 12 m. The water level is 3.5 m above riverbed level, and pumps must be provided to keep
the area dry.
The riverbed consists of 6m of silty sand, overlying low permeability marine clay. The silty sand has a
permeability of 8X10^-5 m/s. The bulk
unit weight of silty sand is 18kN/m^3
Draw a flow net for sheet
pile penetration of 3m. Ensuring that the average upward hydraulic gradient
n the zone of soil enclosed by the dashed line is less than 60% of the critical value associated with a
quick condition. Flownet lines has to be parallel with impermeable boundary, equipotential line is
parallel with constant head boundary and flowline is perpendicular to equipotential lines. Make sure
flow net is squared!
SERIE​

Answer 1

Answer:

The width of the working area is 12m and the length in the perpendicular direction will be much greater than 12 m. The water level is 3.5 m above riverbed level, and pumps must be provided to keep the area dry.

The riverbed consists of 6m of silty sand, overlying low permeability marine clay. The silty sand has a permeability of 8X10^-5 m/s. The bulk unit weight of silty sand is 18kN/m^3

Draw a flow net for sheet pile penetration of 3m. Ensuring that the average upward hydraulic gradient in the zone of soil enclosed by the dashed line is less than 60% of the critical value associated with a quick condition. Flownet lines has to be parallel with impermeable boundary, equipotential line is parallel with constant head boundary and flowline is perpendicular to equipotential lines. Make sure flow net is squared!