GATE CE 2016 Set 2 — Question 54
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Geotechnical Engineering → Shallow Foundations → Effect of Water Table
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Question
A 4 m wide strip footing is founded at a depth of 1.5 m below the ground surface in a soil as shown in the figure. The water table is at a depth of 5.5 m below ground surface. The soil properties are: , , , and . The values of bearing capacity factors for different are given below.
Using Terzaghi's bearing capacity equation and a factor of safety , the net safe bearing capacity (expressed in ) for local shear failure of the soil is __________
| 12.9 | 4.4 | 2.5 | |
| 17.7 | 7.4 | 5.0 | |
| 25.1 | 12.7 | 9.7 | |
| 37.2 | 22.5 | 19.7 |
Correct answer
298 to 300
Solution
For local shear failure:
From the table, for :
Water table is at 5.5 m depth. Depth of base of footing m. Width m.
Depth of water table below base m . Thus, no water table correction is needed ().
Ultimate bearing capacity
Net ultimate bearing capacity
Net safe bearing capacity
From the table, for :
Water table is at 5.5 m depth. Depth of base of footing m. Width m.
Depth of water table below base m . Thus, no water table correction is needed ().
Ultimate bearing capacity
Net ultimate bearing capacity
Net safe bearing capacity
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