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Automatic Calculation of the Coefficient of Pressure Reduction Below Ditch Bottom

For automatic calculation, the coefficient of pressure reduction below ditch bottom k [-] is determined as follows:

  • circular pile curtain (a)

k = 0.9 (1.5d + 0.5)/a

(d ≤ 1 m)

k = 0.9 (d + 1)/a

(d > 1 m)

  • rectangular pile curtain or steel I-section (b)

k = (1.5b + 0.5)/a

(b ≤ 1 m)

k = (b + 1)/a

(b > 1 m)

Note: If coefficient k > 1, then k = 1.

where:

d

-

pile diameter

b

-

footprint of rectangular pile, or flange width of steel I-section

a

-

spacing of soldier beams, or spacing between piles

The coefficient of pressure reduction below ditch bottom k