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DESIGN AND ANALYSIS OF DEEP FOUNDATION. WEEK 10 DESIGN OF BORED PILE DESIGN OF GROUP AND RAKE PILE PILE SETTLEMENT. Learning Outcomes. Student should be able to: Design bored pile. (CO3-PO10) Design pile group. (CO3-PO10) Design rake pile.(CO3-PO10) Estimate pile settlement (CO3-PO10).

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design and analysis of deep foundation
DESIGN ANDANALYSIS OF DEEP FOUNDATION

WEEK 10

  • DESIGN OF BORED PILE
  • DESIGN OF GROUP AND RAKE PILE
  • PILE SETTLEMENT
learning outcomes
Learning Outcomes

Student should be able to:

  • Design bored pile. (CO3-PO10)
  • Design pile group. (CO3-PO10)
  • Design rake pile.(CO3-PO10)
  • Estimate pile settlement (CO3-PO10)
slide3

Bored Pile Design

In Kenny Hill residual soil ie sedimentary soil

Fsu = KsNs

Fbu = KbNb

Chiu and Perumalawamy (1987) used Ks = 2.5 Kb = 50

When socketed into rock, the skin and end bearing shall be based

On the allowable friction and end bearing values

Structural Capacity is taken as F = 0.25fcuA

Where fcu = concrete strength at 28 days

A = cross sectional area of bored pile

Optimise by designing geotechnical capacity to equal structural

capacity

slide28

PILE SPACING

MINIMUN OF 3 DIAMETER CENTRE TO CENTRE OF PILE

FOR NON-CIRCULAR –CENTRE TO CENTRE SPACING

SHOULD BE AT LEAST BE SAME AS THE PERIMETER

lateral load on piles

LATERAL LOAD ON PILES

A pile resists lateral load by mobilising passive pressure of

Surrounding soil.

  • The soil reactions depends on
  • Stiffness of the soil
  • Stiffness of the pile
  • Fixity of the ends of the pile
  • Two categories:
  • Short or rigid piles
  • Long or elastic piles
rake pile
Rake Pile
  • Resist lateral loading in axial.