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Shaft Resistance

Determination of shaft resistance qs should be part of the geological survey.

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

  • for bored piles:

qs

non-cohesive soil

cohesive soil

qc

cu

7,5

15

25

60

150

250

55-80

105-140

130-170

30-40

50-65

65-85

  • for driven piles:

qs

non-cohesive soil

cohesive soil

qc

cu

s/Deq

7,5

15

25

60

150

250

ssg*

30-40

65-90

85-120

20-30

35-50

45-65

sg=0,1Deq

40-60

95-125

125-160

20-35

40-60

55-80

where:

qc

-

cone penetration resistance, CPT [MPa]

cu

-

total cohesion of the soil [kPa]

ssg*

-

settlement at shaft resistance activation

sg

-

limit settlement

Deq

-

pile diameter

Intermediate values may be linearly interpolated.

Literature:

EA-Pfähle, ISBN: 978-3-433-03005

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