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Prepared by J. P. Singh & Associates in association with Mohamed Ashour, Ph.D., PE West Virginia University Tech and Gary Norris Ph.D., PE University of.

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Presentation on theme: "Prepared by J. P. Singh & Associates in association with Mohamed Ashour, Ph.D., PE West Virginia University Tech and Gary Norris Ph.D., PE University of."— Presentation transcript:

1 Prepared by J. P. Singh & Associates in association with Mohamed Ashour, Ph.D., PE West Virginia University Tech and Gary Norris Ph.D., PE University of Nevada, Reno APRIL 3/4, 2006 Computer Program DFSAP Deep Foundation System Analysis Program Based on Strain Wedge Method

2 AXIALLY LOADED PILES/SHAFTS IN LAYERED SOILS (SAND/CLAY)

3 Deformations in soil layers around an axially loaded shafts QoQo QTQT Sheared soil layers Loading Direction  q X X Vert. Shear Stress distribution Shaft Cross Section oo nn Shaft roro rnrn r n + m Displacement, z z max Distance  n + m znzn Z n + m Shear Stress,  Vertical Shear Stress Shaft Cross Section Shaft Vertical Displacement, Z Shear Stress, T T-Z curve

4 Layer 1 Layer 2 Layer 3

5 A Comparison Between Measured and Computed Axial Pile Load at Different Depths (After Vesic, 1970)

6 Fig Comparison Between Measured and Predicted Load Transfer (  ) – Pile Movement (z) Curve for the California Test

7 Predicted Pile-Head Load-Settlement Curves for Seven Loading Tests at Different Time Periods for the California Test in Comparison with the Predicted Results Axial Load Distribution along the Pile

8 Layer 3 Liquefiable soil  = 32 0 Clay Effect of Developing Liquefaction on Axial Capacity of a Pile from FHWA/RD/86/102 Layer 1 Layer 2 Layer 4

9 No Liquefactiona max = 0.25g, M = 6.5a max = 0.40g, M = 6.5 Effect of Soil Liquefaction on the T-z Curve

10 K s = 14.4 x 10 7 lb/ft K s = 14.2 x 10 6 lb/ft Pile Axial Stiffness Using DFSAP vs. FHWA/RD/86/102

11 Piles/Shafts in Sloping Ground Lateral Load Different Failure Planes Sloping Ground

12 Piles/Shafts in Sloping Ground

13 10 Degree Sloping Ground0 Degree Sloping Ground

14 Effect of Ground Slope on Pile/Shaft Lateral Response (Downhill Loading)

15 Effect of Ground Slope on Pile/Shaft Lateral Response (Uphill Loading)

16 Effect of Ground Slope on Pile/Shaft Lateral Response


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