Lec4_Piled Raft
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20-Oct-15<br />
Design Philosophy of <strong>Piled</strong> <strong>Raft</strong>s<br />
Conventional Pile Design Method<br />
• Disregards the capacity of Pile caps/<strong>Raft</strong>s<br />
• Increased number of piles or length of piles<br />
• Very small allowable settlement<br />
• Pile factor of safety (FS ≈ 2)<br />
<strong>Piled</strong> <strong>Raft</strong> Design Method<br />
• <strong>Raft</strong> is the main bearing element<br />
• Design for full utilization of pile capacity (FS ≥1)<br />
• Piles are Settlement reducers<br />
• Consideration of the optimal location of piles to<br />
decrease the differential settlement and bending moment of raft.<br />
Prof. V.S.Raju Consultants<br />
3<br />
Concept of <strong>Piled</strong> <strong>Raft</strong> :<br />
• A very good reference<br />
“The <strong>Piled</strong> <strong>Raft</strong> Foundation for The Burj Dubai – Design and<br />
Performance “, IGS-Ferroco Terzaghi Oration – 2008, by Prof.Harry<br />
Poulos.<br />
Prof. V.S.Raju Consultants<br />
4<br />
V.S.Raju Consultants 2
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