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Design Guidelines for Increasing the Lateral Resistance of Highway-Bridge Pile Foundations by Improving Weak Soils (2011) / Chapter Skim
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Chapter 4 - Finite Element Modeling of Single Pile Load Test
Pages 51-53

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From page 51...
... In the finite element model, the elastic Young's moduli and compression strengths are needed. The elastic Young's moduli can be estimated from the following relationships: where G is the shear modulus; vs is the shear wave velocity measured from the downhole seismic cone testing; γ is the total soil unit weight that can be estimated by averaging from the lab data along the depth; g is the gravity constant; rd is a reduction factor that accounts for the large deformation effect and remolding effect, here a value of 0.25; E is the Young's modulus in the elastic part of the von Mises model; and The Poisson's ratio, v, is assumed as 0.45 due to the nearly undrained condition of the clay during the tests.
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From page 52...
... Vs (Fps) 1 0.0 2.5 2.5 950 416 2 2.5 5.0 2.5 325 389 3 5.0 7.5 2.5 350 357 4 7.5 10.0 2.5 400 338 5 10.0 12.5 2.5 450 355 6 12.5 15.0 2.5 500 425 7 15.0 17.5 2.5 525 495 8 17.5 20.0 2.5 550 565 9 20.0 22.5 2.5 600 550 10 22.5 27.5 5.0 655 500 11 27.5 32.5 5.0 750 500 12 32.5 37.5 5.0 845 500 13 37.5 45.0 7.5 940 500 Notes: Su is undrained shear strength; Vs is shear wave velocity; and Fps is feet per second.
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From page 53...
... The curves exhibit the conventional hyperbolic shape that would be expected for soft clay and are in good agreement with the test data. This suggests that the single pile in clay under lateral loading can be satisfactorily simulated using the simple von Mises soil model with the above-mentioned parameters.
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Key Terms

  • wave velocity
  • shear wave
  • undrained shear
  • von mises
  • shear strength

  • single pile
  • finite element
  • head load
  • head displacement
  • head rotation

  • test data
  • tested data
  • element model
  • static loading
  • solid element

  • concrete cylinders
  • yield strength
  • middle plane
  • toe depth
  • undrained strength

  • stiffness value
  • head deflection
  • element modeling
  • satisfactorily simulated
  • versus pile

  • lateral displacement
  • pile lateral
  • loading step
  • pile toe
  • pile load


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