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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Lecture 5 Shallow Foundations Bearing Capacity
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Bearing Capacity: 3 regions
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Model test
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
토질역학 Review - 전단강도
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
토질역학 Review - 전단강도
Ultimate Bearing Capacity: The load per unit area of the foundation at whichshear failure in soil occurs (Resistance > Load)
Design Criteria: Settlement(Expected settlement < Tolerable settlement)
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Bearing Capacity Equation
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Bearing Capacity Equation
qu
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Bearing Capacity Equation
Lecture Outline
•Terzaghi’s Bearing Capacity Equation
•Modified Bearing Capacity Equation
•Shape, Depth, Inclination Factors
•Bearing Capacity in Clays (’=0)
•Bearing Capacity in Sands (c’=0)
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Terzaghi’s Bearing Capacity Theory
45-’/2
Shallow if Df ≤ B
A C
D EF
GH
IJ
3 Zones1. Triangular Zone: ACD2. Radial Shear Zone: ADF and CDE (DE and DF are arcs of a logarithmic spiral)3. Rankine Passive Zone: AFH and CEG
Another Assumption: = ’
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Terzaghi’s Bearing Capacity Theory
)(21' foundationstripBNqNNcq qcu
)(3.0'3.1 foundationcircularBNqNNcq qcu
)(4.0'3.1 foundationsquareBNqNNcq qcu
2(3 /4 '/2) tan '
2 '2cos 452
qeN
'cot1 qc NN
'tan1'cos2
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pK
N
Mathematically Exact Solutions
Non analytical solution
General shear failure mode
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Terzaghi’s Bearing Capacity Theory
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Modified Bearing Capacity EquationTerzaghi’s Assumption: = ’
New Assumption: = 45 + ’/2
'cot1 qc NN
'tan2
2'45tan eNq
N 2 Nq 1 tan ' Caquotand Kerisel (1953), Vesic(1973)
N Nq 1 tan 1.4 ' Meyerhof 1963 N 1.5 Nq 1 tan ' Hansen 1970
Mathematically Exact SolutionsNot analytical
solution
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Check page 139
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Nγ
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
General Bearing Capacity Equation
idsqiqdqsqcicdcscu FFFBNFFFqNFFFNcq 21'
Shape FactorsFcs, Fqs, Fs
Depth FactorsFcd, Fqd, Fd
Inclination FactorsFci, Fqi, Fi
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Shape Factor
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Depth Factor
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Meyerhof (1963)’s factors
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Hansen (1970)’s factors
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Vesic (1973)’s factors
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© Park 지반공학및실험 lecture_05_shallow_foundation_capacity
Shape and Depth Factors
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