Compression Load Tests on Composite Foundations of Spread Footing Anchored by Helical Anchors

Table 1

Test site soil conditions.

Layer	Soil layer thickness H (m)	SPT number N (blow counts/300 mm)	Moisture content; (%)	Unit weight γ (kN/m^3)
Topsoil (fill)	0.9–1.0	6–7	19–25	—
Silty clay	7.7–7.8	9–23	20–27	18.9
Sandy silt	10.2–10.8	33–48	—	19.3