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 h_a,i:

where:	X_i	-	material parameters at i^th layer
	X_c	-	material parameters of sand-gravel cushion

For layer h_b,i:

where:	A_c	-	area of sand-gravel cushion
	X_c	-	material parameters of sand-gravel cushion
	X_b,i	-	material parameters of b,i layer
	b_i	-	cushion widths in the i^th layer
	l_i	-	cushion length in the i^th layer

Analysis X_i in the sand-gravel cushion

GEO5