Braced sheeting

When analyzing braced sheeting the following approach is adopted to determine the earth pressures:

Up to the depth of ditch the pressures are determined with respect to one running meter of the structure width. Below the ditch bottom the earth pressures are multiplied by the coefficient of reduction k (the "Coeff. of reduction of pressures below ditch bottom" – can be inputted in the frame "Geometry" as a parameter of the section of a structure) – the pressures are determined with respect to a reduced structure width k*b. In case of continuous wall the coefficient is set to one and no reduction of pressures is assumed. If "Landing of soil" above the ditch ("Excavation" dialog window) is inputted, then the pressures within this section are computed with respect to the whole width of wall (k=1).

The coefficient k can be approximately determined (for very conservative design) according to:

Actual value of the coefficient also depends on the soil type and space effect of earth pressure. Real values of coefficients (based on experiments) are two- or three-times higher than values calculated with the help of the previous formula.

Braced sheeting