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Influence of Sand-Gravel Cushion

If the sand-gravel cushion is specified below the spread footing, the material parameters X in individual layers are computed in the following way:

For layer ha,i:

where:

Xi

-

material parameters at ith layer

Xc

-

material parameters of sand-gravel cushion

For layer hb,i:

where:

Ac

-

area of sand-gravel cushion

Xc

-

material parameters of sand-gravel cushion

Xb,i

-

material parameters of b,i layer

bi

-

cushion widths in the ith layer

li

-

cushion length in the ith layer

Analysis Xi in the sand-gravel cushion

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