1. DESIGN AND ANALYSIS OF DEEP FOUNDATION WEEK 10 DESIGN OF BORED PILE DESIGN OF GROUP AND RAKE PILE PILE SETTLEMENT

2. 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)

3. Bored Pile Design In Kenny Hill residual soil ie sedimentary soil F su = K s N s F bu = K b N b Chiu and Perumalawamy (1987) used K s = 2.5 K b = 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

4. SETTLEMENT OF PILE

28. 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

29. LATERAL LOAD ON PILES A pile resists lateral load by mobilising passive pressure of Surrounding soil. The soil reactions depends on 1)Stiffness of the soil 2)Stiffness of the pile 3)Fixity of the ends of the pile Two categories: 1)Short or rigid piles 2)Long or elastic piles

31. Rake Pile Resist lateral loading in axial.