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DEEP FOUNDATIONS – PART I

DEEP FOUNDATIONS – PART I. M. Zoghi, Ph.D., P.E. Geotechnical Design Fall 2007. Outline. Significance Types Load Transfer Mechanism Single Pile Capacity Examples. I. Significance. Highly compressible and too weak. Highly compressible and too weak. End-Bearing Pile. Friction Pile.

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DEEP FOUNDATIONS – PART I

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  1. DEEP FOUNDATIONS – PART I M. Zoghi, Ph.D., P.E. Geotechnical Design Fall 2007

  2. Outline Significance Types Load Transfer Mechanism Single Pile Capacity Examples

  3. I. Significance Highly compressible and too weak Highly compressible and too weak End-Bearing Pile Friction Pile Laterally-Loaded Pile

  4. Expansive and Collapsible Soils Transmission Towers, Offshore Platforms, etc. Subjected to Uplifting Force Bridge Abutments Supported via Piles and Piers – to Avoid Scouring!

  5. II. Types Steel H-piles Steel pipe-piles Cast-in-situ concrete piles Precast concrete piles Prestressed concrete piles Auger-cast piles Timber piles

  6. H-Piles Steel H-Piles Advantages * High individual load capacity when driven to practical refusal. * Readily available. * Easily shortened or extended. * Can be installed with conventional driving equipment. * Minimal disturbance to adjacent piles or structures. * Easily driven through dense granular soil or very stiff clays. * Reduced soil heave and ground vibrations. * Excellent penetrating capability. * High lateral capacity. * High uplift capacity. Disadvantages * Higher cost if lightly loaded. * Tend to drive deeper in loose sands and silty sand. * Post driving visual inspection not possible. * Maintaining fixed web orientation for lateral loading. General * Common splices involve full penetration butt weld. * Most efficient when driven through deep soft to medium stiff clays to refusal on rock. * Propriety splicers available. * Toe reinforcing may be required in areas of dense soil, soil containing boulders or rock, or when driven to sloping rock. * Cathodic or other protection may be required.

  7. Splice of H-pile by welding Splice of pipe pile by welding Splicing by riveting

  8. Pipe Piles Flat-Driving Point of Pipe Pile Conical Driving Point Pipe Pile

  9. Precast Concrete Piles Precast piles with ordinary reinforcement

  10. Cast-in-place concrete piles

  11. Timber Piles Splicing of timber piles: (a) via pipe sleeves; (b) via metal straps

  12. III. Load-Transfer Mechanism

  13. IV. Single Pile Capacity

  14. α-Method

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