DAB20702_BAB 2_PART 1.pdf
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Transcript of DAB20702_BAB 2_PART 1.pdf
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PAD FOOTING DESIGN AND
CONSTRUCTION PART 1
PREPARED BY AHMAD HAKIMI BIN MAT NOR
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BEARING CAPACITY ANALYSIS
BEARING
CAPACITY
FAILURE
Foundation
consideration rest
on dense sand @
stiff cohesive soil(a) General shearfailure
(b) Local shear
failure
(c)Punching shear
failure
Foundation
consideration rest
on sand @ clayey
soil of medium
compaction
Foundation
consideration rest
on fairly loose soil
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Plastic Analysis Of Bearing Capacity (Terzaghi method)
III IIII
IIII
Ø
Zone I : Triangular Zone
Zone II : Zone of Radial Shear
Zone III : Rainkine Passive Zone
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Allowable bearing capacity (qa)
The allowable bearing capacity , qa is the loading per unit area thatthe soil is able to support without unsafe movement,
Where:
qa = allowable bearing capacity
qult = ultimate bearing capacity
FS = safety factor
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Ultimate bearing capacity in cohesive soil (qult)
The basic principle in evaluating the bearing capacity of cohesive soil (clayey) soil
is best introduced by Terzaghi (Terzaghi and Peck,1967).
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Note : e is the base of natural
logarithms- approximately
2.71828
The line on figure 9.4
representing Nγ was found by
plotting values determined in
studies Meyerhof (1955)
Nγ=22
Nq=23
Nc=36
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Local Shear Failure
C’ and Ø’
qu = c’N’c + γ1Df N’q + 0.5γ2 BN’γ
Shear Strength --- C and Ø
Note:
- Loose sand and soft clay = Local shear failure
-Dense Sand and Hard Clay = General shear failure
@-Ø ≥36 ̊= General shear failure
-Ø ≤ 29 ̊= Local shear failure
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Rajah 9.4
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EFFECT OF WATER TABLE ON BEARING
CAPACITY
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Case III. When the water table is located so that d ≥ B, the water will have no
effect on the ultimate bearing capacity
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END