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GEO5

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Shaft Bearing Capacity

The vertical bearing capacity of the shaft is given by the formula:

where:

Rs

-

shaft resistance

As

-

contact area

qs

-

skin friction

Note: The contact area is calculated for rectangular and pile walls, for other cross-sections, it must be defined manually [m2/m, ft2/ft].

Determination of skin friction qs should be part of the geological survey.

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

- for sheet piles

non-cohesive soil

qc

7,5

15

25

qs

20

40

50

- for driven pile walls

qs

non-cohesive soil

cohesive soil

qc

cu

s/Deq

7,5

15

25

100

150

200

ssg*

30-40

65-90

85-120

20-30

35-50

45-65

ssg=sg=0,1Deq

40-60

95-125

125-160

20-35

40-60

55-80

- for bored pile walls

non-cohesive soil

qc

7,5

15

25

qs

55-80

105-140

130-170

where:

qc

-

cone penetration resistance, CPT [MPa]

cu

-

total cohesion of the soil [kPa]

ssg*

-

settlement at shaft resistance activation

ssg=sg

-

limit settlement

Literature:

EA-Pfähle, ISBN: 978-3-433-03005-9.

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