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Base Resistance

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

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

  • for bored piles:

qb

non-cohesive soil

cohesive soil

qc

cu

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

sg=0,10

1600-2300

3000-4000

4000-5300

800-1000

1200-1500

1600-2000

  • for driven piles:

qb

non-cohesive soil

cohesive soil

qc

cu

s/Deq

7,5

15

25

100

150

250

0,035

2200-5000

4000-6500

4500-7500

350-450

550-700

800-950

sg=0,10

4200-6000

7600-10200

8750-11500

600-750

850-1100

1150-1500

where:

qc

-

cone penetration resistance, CPT [MPa]

cu

-

total cohesion of the soil [kPa]

s

-

pile settlement

sg

-

limit settlement

D, Deq

-

pile diameter

Intermediate values may be linearly interpolated.

Literature:

EA-Pfähle, ISBN: 978-3-433-03005-9.

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