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Task 2.1
Geotechnics: The bearing Capacity of the shallow foundation is calculated by using the Terzaghi equation of soil mechanics which is given by the following expression(Chenglieu,2008):
Geotechnics: Using the table for the value of ,, for clayey soil where c>0 and ɸ = 0(Chenglieu,2008 & Bowels,2010) the vaues are
= 5.14
= 1.0
= 0
For Shallow Foundation Case
For Soil Zone A (Development Area 1)
Geotechnics:
Load Data = 400 to 800 kN
Average Load = 600 kN
Wall load = 65 to 80 kN/m
Average Wall load = 72.5 kN/m
Cu = 65 to 90 kN/m2 (For Firm Clay Soil)
Cu avg =77.5 kN/m2 (For Firm Clay Soil)
Cu = 125 to 200 kN/m2 (For Stiff to very Stiff Clay Soil)
Cu avg =162.5 kN/m2 (For Stiff to very Stiff Clay Soil)
γ = 18.86 kN/m3 (For Clayey Soil)
Depth of Foundation = D = 2 m
Area of Foundation = A = Required
Factor of Safety = FS = 3
By substituting the given values in the above equation we get:
C = (1-2)
By substituting the given values in the above equation we get:
q = 2C
qult Firm Clay = 2*77.5 = 155 kN/m2
q = Q/A
A = Q/q
A1 = 600/155 = 3.87 = 4
Length of Footing = 2m
Breadth of Footing = 2m
| qall Firm Clay = 77.5*5.14 + 18.86*2*1.0 = 436.07/3 = 145.36 kN/m2 |
| qult Stiff to very Stiff Clay = 2*162.5 = 325 kN/m2 |
Geotechnics
A2 = 600/325 = 1.85m2 = 2
For Zone A Average Area of Footing = = 3m X 3m
qall Stiff to very Stiff Clay = 162.5*5.14 + 18.86*2*1 = 872.97/3 = 291 kN/m2
Average allowable Bearing Capacity for Zone A = (145.36 +291)/2 = 218 kN/m2
For Soil Zone A (Development Area 2)
Load Data = 1000 to 2500 kN
Maximum Load = 2500 kN
Cu = 65 to 90 kN/m2 (For Firm Clay Soil)
Cu avg =77.5 kN/m2 (For Firm Clay Soil)
Cu = 125 to 200 kN/m2 (For Stiff to very Stiff Clay Soil)
Cu avg =162.5 kN/m2 (For Stiff to very Stiff Clay Soil)
γ = 18.86 kN/m3 (For Clayey Soil)
Depth of Foundation = D = 2 m
Area of Foundation = A = Required
Factor of Safety = FS = 3
By substituting the given values in the above equation we get:
C = (1-2)
By substituting the given values in the above equation we get:
q = 2C
qult Firm Clay = 2*77.5 = 155 kN/m2
q = Q/A
A = Q/q
A1 = 2500/155 = 16m2
Length of Footing = 4m
Breadth of Footing = 4m
| qall Firm Clay = 77.5*5.14 + 18.86*2*1.0 = 436.07/3 = 145.36 kN/m2 |
| qult Stiff to very Stiff Clay = 2*162.5 = 325 kN/m2 |
A2 = 2500/325 = 9m2
For Zone A Average Area of Footing = = 4m X 4m
qall Stiff to very Stiff Clay = 162.5*5.14 + 18.86*2*1 = 872.97/3 = 291 kN/m2
Average allowable Bearing Capacity for Zone A = (145.36 +291)/2 = 218 kN/m2
For Soil Zone A (Development Area 3)
Wall load = 30 to 50 kN/m
Average Wall load = 40 kN/m
Cu = 65 to 90 kN/m2 (For Firm Clay Soil)
Cu avg =77.5 kN/m2 (For Firm Clay Soil)
Cu = 65 to 90 kN/m2 (For Stiff to very Stiff Clay Soil)
Cu avg =77.5 kN/m2 (For Stiff to very Stiff Clay Soil)
γ = 18.86 kN/m3 (For Clayey Soil)
Depth of Foundation = D = 2 m
Average Area of Foundation = 2m X 2m
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