Soldier Pile Wall (Braced Sheeting)
Up to the depth of ditch the pressures are determined with respect to 1 rm of the structure width. Below the ditch bottom the earth pressures are multiplied by the coefficient of reduction k (the "Coefficient of pressure reduction below ditch bottom"). This coefficient can be input (in the frame "Geometry" as a parameter of the section of a structure) or automatically calculated.
If "Landfill of soil" above the ditch (frame "Excavation") is input, then the pressures within this section are computed with respect to the entire width of wall (k = 1).
The coefficient of pressure reduction below ditch bottom k can be approximately determined (for very conservative design) according to:
longitudinal spacing of soldier beams, or spacing between piles
width of soldier beam, or diameter of pile
Real value of the coefficient k also depends on the soil type and space effect of earth pressure. Real values of this coefficient (based on experiments) are two to three-times higher than values calculated with the help of the previous formula.
Braced sheeting - schematic view of retaining structure