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Published byJayson Wiggins Modified over 9 years ago
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TOPIC 3: DESIGN AND ANALYSIS OF SHALLOW FOUNDATION WEEK 6
SETTLEMENT OF FOUNDATION ON SOIL REVIEW OF VERTICAL STRESS DISTRIBUTION FOUNDATION ON FILL
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Learning Outcomes Students should be able to:
Determine the type of foundation on fill (CO2-PO10)
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SETTLEMENT OF 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
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Calculation of Vertical Stress Increase
A) Stress Increase due to Concentrated Load
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B) Stress due to Circularly Loaded Area
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C) 2 : 1 Method
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OTHER METHODS Newmarks Chart Fadums Chart Pressure Bulbs Chart
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Type of Fill Non engineered fill Engineered fill Reclaimed land
FOUNDATION ON FILL Type of Fill Non engineered fill Engineered fill Reclaimed land
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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.
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TOPIC 3: DESIGN AND ANALYSIS OF SHALLOW FOUNDATION WEEK 7
Theoretical and Empirical Method for Estimating Settlement. Total and Differential Settlement to Limit Damage
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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.
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Elastic Settlement
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Settlement of Rigid Foundation
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Empirical Methods
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Method based on Standard Penetration Test
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Elastic Parameters of Soil
Correlation
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Primary Consolidation Settlement
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Primary Consolidation Settlement Calculations
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Secondary Compression Index
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Tolerable Settlement of Buildings
Parameters for Differential Settlement
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Tolerable Settlement of Buildings
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Guideline for Tolerable Settlement
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Limiting Angular Distortion
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Field Load Test Test in Clay, qu(F) = qu(P) Sand, qu(F) = qu(P) BF/BP
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For sand, SF/SP = 4/ (1 +BP/BF)2
For a given qo Terzaghi and Peck: For sand, SF/SP = 4/ (1 +BP/BF)2 Clay, SF = SP. BF/BP
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Calculate the average Stress Increase for the clay layer and the
Consolidation Settlement
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