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Base Resistance

Determination of base resistance q_b should be part of the geological survey.

Recommended values of resistance q_b [kPa] can be found in professional literature for specific soils and structure types:

for bored piles:

	q_b
	non-cohesive soil			cohesive soil
	q_c			c_u
s/D	7,5	15	25	100	150	250
0,02	550-800	1050-1400	1750-2300	350-450	600-750	950-1200
0,03	700-1050	1350-1800	2250-2950	450-550	700-900	1200-1450
s_g=0,10	1600-2300	3000-4000	4000-5300	800-1000	1200-1500	1600-2000

for driven piles:

	q_b
	non-cohesive soil			cohesive soil
	q_c			c_u
s/D_eq	7,5	15	25	100	150	250
0,035	2200-5000	4000-6500	4500-7500	350-450	550-700	800-950
s_g=0,10	4200-6000	7600-10200	8750-11500	600-750	850-1100	1150-1500

where:	q_c	-	cone penetration resistance, CPT [MPa]
	c_u	-	total cohesion of the soil [kPa]
	s	-	pile settlement
	s_g	-	limit settlement
	D, D_eq	-	pile diameter

Intermediate values may be linearly interpolated.

Literature:

EA-Pfähle, ISBN: 978-3-433-03005-9.

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