Field Tests and Simplified Calculation Method for Static Drill Rooted Nodular Pile

Table 1

Soil profile and parameters for the tested piles.

Number of layers	Name of soil layer	Elevation at bottom of layers (m)	Thickness of soil layer (m)	Specific penetration resistance (m)	Value of ultimate friction resistance of pile side (kPa)	Ultimate friction resistance of pile end (kPa)
①-1	Miscellaneous fill	1.09	1.09		15
②-1	Silty clay	−0.31	1.4	0.65	40
②-3	Sandy silty soil	−3.61	3.3	2.75	15
③	Muddy silty clay	−7.51	3.9	0.46	25
④	Muddy clay	−17.04	9.53	0.61	40
⑤-1	Silty clay	−25.41	8.37	1.04	55
⑤-3	Silty clay with silt	−36.11	10.7	1.63	65
⑤-4	Silty clay	−38.41	2.3	2.13	65
⑦	Clay silt	−42.31	3.9	4.28	65
⑧-1	Silty clay	−47.21	4.9	2.01	60
⑧-2	Silty soil interbedded with silty clay	−55.17	7.96	7.04	80	3500
⑨	Silt	—		15.21	110	8500