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123Pier typeAggregate PierUnit CellAggregate PierGroup of 2Aggregate PierGroup of 4A AggregatePier Group of 5Aggregate PierGroup of 6Length(mm)Table 31: Measured ultimate bearing capacityq or σ at δtop =A g (m 2 ) A (m 2 ) R a10 mm (kPa)σ loess at δtop =10 mm (kPa)R sq g total (kPa)305 0.0046 0.0781 0.058 1,1471.0 1,1921,101610 0.0046 0.0781 0.058 1,460 1.3 1,900305 0.0091 0.1490 0.061 2,4001.5 3,4751,609610 0.0091 0.1490 0.061 2,869 1.8 4,882305 0.0182 0.2845 0.064 3,6091.3 4,6922,719610 0.0182 0.2845 0.064 N/A N/A N/A305 0.0228 0.3413 0.067 4,2251.6 6,3312,719610 0.0228 0.3413 0.067 4,630 1.7 7,531305 0.0274 0.5426 0.050 4,0962.2 8,3991,886610 0.0274 0.5426 0.050 5,672 3.0 15,490Legend:A g - cross sectional area of all aggregate pier elements (m 2 )A g - area of matrix soil beneath the footing (m 2 )R s - ratio of A g to gross footprint area of the footing AR s - ratio of pier and matrix soil modulus values at δ top = 10mmq - average contact pressure at the footing bottom (kPa)Conversions:1 m = 3.3 ft1 mm = 0.0394 in1 kPa = 0.145 psi1 kg/m 3 = 0.0624 pcfFigure 81 shows the bearing capacity results obtained for 305 mm and 610 mm groups offour, five and single piers. The figure also outlines the bearing capacity results of full-scalegroups of piers tested by other researches. The full-scale piers length is outlined in the figure.Bearing capacity for single piers within RAP groupBearing Capacity at 10mm settlement (kPa)25002000150010005000.Figure 81: Bearing capacity305 - 305 mmvalues(shortcomparedpier)between laboratory and field tested610 - 610 mm (long pier)footings (single pier, group of four and group of five footings)lab 305mm pierlab 610mm pierfield 2.79m pier*Full scale piersLab tested piersSingle Pier*White et al., 2007**Wissmann et al., 2007Group of 4Group of 5field 5.1m pier*lab 305mm pierfield 2.79m pier *field 5.1m pier *lab 305mm pierlab 610mm pierfield 2.4m pier**