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TOPIC 3: DESIGN AND ANALYSIS OF SHALLOW FOUNDATION WEEK 6

TOPIC 3: DESIGN AND ANALYSIS OF SHALLOW FOUNDATION WEEK 6. SETTLEMENT OF FOUNDATION ON SOIL REVIEW OF VERTICAL STRESS DISTRIBUTION FOUNDATION ON FILL. Learning Outcomes. Students should be able to: Determine the type of foundation on fill (CO2-PO10). SETTLEMENT OF SHALLOW FOUNDATION.

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TOPIC 3: DESIGN AND ANALYSIS OF SHALLOW FOUNDATION WEEK 6

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  1. TOPIC 3: DESIGN AND ANALYSIS OF SHALLOW FOUNDATIONWEEK 6 • SETTLEMENT OF FOUNDATION ON SOIL • REVIEW OF VERTICAL STRESS DISTRIBUTION • FOUNDATION ON FILL

  2. Learning Outcomes Students should be able to: • Determine the type of foundation on fill (CO2-PO10)

  3. SETTLEMENTOF SHALLOW FOUNDATION • Total settlement = Immediate Settlement + Consolidation Settlement • Immediate settlement (elastic) takes place during or immediately after the construction of the structure. • Consolidation Settlement occurs over a period of time. Consists of: • Primary – squeezing of water from its void • Secondary – slippage and reorientation of soil particles

  4. Calculation of Vertical Stress Increase A) Stress Increase due to Concentrated Load

  5. B) Stress due to Circularly Loaded Area

  6. C) 2 : 1 Method

  7. OTHER METHODS • Newmarks Chart • Fadums Chart • Pressure Bulbs Chart

  8. FOUNDATION ON FILL Type of Fill • Non engineered fill • Engineered fill • Reclaimed land

  9. Foundation Selection • May use raft for engineered fill – need to confirm before construction • Ground improvement for reclaimed land – PVD, Vibro compaction, Dynamic ompaction, stone column etc • Piling for non engineered fill.

  10. TOPIC 3: DESIGN AND ANALYSIS OF SHALLOW FOUNDATIONWEEK 7 • Theoretical and Empirical Method for Estimating Settlement. • Total and Differential Settlement to Limit Damage

  11. Learning Outcomes Students should be able to: • Able to estimate settlement (CO2-PO10) • Able to determine angular distortion (CO2-PO10) • Able to discuss on tolerable settlement. (CO2-PO10)

  12. Elastic Settlement

  13. Settlement of Rigid Foundation

  14. Empirical Methods

  15. Method based on Standard Penetration Test

  16. Elastic Parameters of Soil Correlation

  17. Primary Consolidation Settlement

  18. Primary Consolidation Settlement Calculations

  19. Secondary Compression Index

  20. Tolerable Settlement of Buildings Parameters for Differential Settlement

  21. Tolerable Settlement of Buildings

  22. Guideline for Tolerable Settlement

  23. Limiting Angular Distortion

  24. Field Load Test Test in Clay, qu(F) = qu(P) Sand, qu(F) = qu(P) BF/BP

  25. For a given qo Terzaghi and Peck: For sand, SF/SP = 4/ (1 +BP/BF)2 Clay, SF = SP. BF/BP

  26. Calculate the average Stress Increase for the clay layer and the Consolidation Settlement

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