Docstoc

Pile foundations

Document Sample
Pile foundations Powered By Docstoc
					                                 56b4e4f8-abf1-4a76-bfea-4be6e5c



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)
             a   0.4            Adhesion Factor
           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
             Circular                                                     Allowable Load
    Diameter  2.31    m         Diameter of pile                                    5006
   Toe Depth    10    m         Depth to base of pile
                                                                          Overall factor of safety
         Load    5000   kN      Applied load - includes weight of pile               2.00
                                                                          OK
Safety Factors                                                            Actual Load <=Allowable
        Base     2.0            Shaft         2.0                         Pile Volume
                                                                                    41.9




                                              Page 1
                                             56b4e4f8-abf1-4a76-bfea-4be6e5c



                                              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)
Actual Load <=Allowable
                                                      fs= 60.0     kN/m²
                m³




                                                         Page 2
                        56b4e4f8-abf1-4a76-bfea-4be6e5c




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

				
DOCUMENT INFO
Shared By:
Categories:
Stats:
views:72
posted:7/7/2011
language:English
pages:3