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# Pile foundations

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• pg 1
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Soil Details                                                              Results
g   19     kN/m³   Unit weight of soil (gamma)               10m long Circular pile
c' (or su)   150    kN/m²   For undrained soils use phi' = 0          2.31m diameter
f    0     deg     Angle of friction (phi')                  Undrained Analysis (Phi=0)
Ks     0             Coefficient of Earth Pressure             Base Resistance
d    0     deg     Angle of friction between pile and soil             5658
Water Table    20     m       Depth to Water Table                      Shaft Resistance
4354
Pile Details                                                              Total ultimate resistance
10012
Shape    ci              sq=Square, ci=Circular
Diameter  2.31    m         Diameter of pile                                    5006
Toe Depth    10    m         Depth to base of pile
Overall factor of safety
OK
Base     2.0            Shaft         2.0                         Pile Volume
41.9

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Pile Capacity Calculations
10m long Circular pile                        Bearing Capacity Factors
Nq= 0.77     (Berezantzev et al)
Undrained Analysis (Phi=0)                          Nc= 9.00

Base Resistance                               Overburden stress
kN                              sigma_b= 190.00 (at Base)
Shaft Resistance                               sigma_s= 95.00   (average for Shaft)
kN
Total ultimate resistance                     Base Bearing Capacity
kN          (Base + Shaft)    qu=suNc (for undrained analysis)
qu=cNc+sigma_b*Nq (for drained analysis)

kN                                  qu = 1350      kN/m²

Overall factor of safety                      Shaft skin friction
fs=alpha.su (for undrained analysis)
fs=c'+Ks.sigma_s.tan(delta) (for drained analysis)
fs= 60.0     kN/m²
m³

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Depth/Width=     4.33

Areas
Base (Ab) =      4.19    m²
Shaft (As) =     72.6    m²

Base Resistance

Qb=qu*Ab

Qb= 5658      kN

Shaft Resistance

Qs=fs*As

Qs= 4354      kN

Page 3

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