Exit Gradient Sheet Pile Wall

It con sists of graded sand and gravel.

Exit gradient sheet pile wall.

Musa 2014 studied the influence of cavities on seepage under sheet pile wall for hydraulic. The 7 saturated unit weight of the soil is 130 pcf and the hydraulic conductivity is 3x10 ft sec. Exit gradient at toe of hydraulic structure g usin computer program seep w software. It is observed that the best location of sheet pile to reduce seepage flow is at the downstream end.

A compute the total quantity of seepage in units of ft through the soil over a 24 hour b compute the critical hydraulic gradient and factor of safety against quick sand given this. Depended on the software program tests were carried out with three different value of each following parameter upstream sheet pile depth downstream sheet pile depth permeability for first and second soil layer depth of first and. 10 20 such that the factor of safety against heave piping is improved as shown in f w w f f s 10 47. In 1954 terzaghi has suggested a simplified approach for the design of cutoff walls considering average seepage force.

Of significance for later discussions is that the gradient is computed for a head loss over a fairly long distance of 3 3 m. A sheet pile cutoff wall simply called cutoff wall is used in almost all types of water retaining structures to reduce the exit gradient at the downstream toe and prevent the chances of sand boiling and piping. For the sheet pile wall this filter is placed over the potentially unstable prism abed in fig. The flow net for a sheet pile is shown below.

It is placed at the exit point where the water emerges from the foundation. The computed gradient is in essence an average gradient over this distance. The sheet pile penetrates 20 feet into the soil.