Geotechnical Engineering

IS Code Method for Computing Bearing Capacity

Question 1
Marks : +2 | -2
Pass Ratio : 14%
The depth factor can be applied to footing only when ___________
Back filling is compacted
Shape factors are not used
The base of the footing is circular
All of the mentioned
Explanation:
The depth factor can be applied only the back filling is done with proper compaction.
Question 2
Marks : +2 | -2
Pass Ratio : 14%
The ultimate bearing capacity for cohesive soil can be calculated using the equation __________
q nf = c Nc.sc
q nf = c Nc.sc.dc.ic
q nf = Nc.sc.dc
q nf = sc.dc.ic
Explanation:
The net ultimate bearing capacity after construction on fairly saturated homogeneous cohesive soils can be calculated from the expression:
Question 3
Marks : +2 | -2
Pass Ratio : 14%
The effect of the water table is taken into account for bearing capacity in the form of ___________
Depth factor
Inclination factor
Correction factor
Shape factor
Explanation:
The effect of the water table is taken into account in the form of correction factor W’ applied to the wedge term.
Question 4
Marks : +2 | -2
Pass Ratio : 14%
According to IS code, there are __________ types of failures of soil support beneath the foundation.
2
4
3
5
Explanation:
The code recognizes, depending upon the deformation associated with the load and the extent of development of failure surface, three types of failures of soil support beneath the foundations which are general, local and punching shear failure.
Question 5
Marks : +2 | -2
Pass Ratio : 14%
The standard penetration resistance is determined at a number of selected points at intervals of __________
80 cm
75 cm
100 cm
10 cm
Explanation:
Indian standard recommends that the standard penetration resistance is determined at a number of selected points at intervals of 75 cm in the vertical direction or change of strata if it takes place earlier.
Question 6
Marks : +2 | -2
Pass Ratio : 14%
If the water table is located at the depth D, then the value of W’ is taken as ___________
1
0.5
2
0
Explanation:
If the water table is located at the depth D or likely to rise at the base of the footing or above, then the value of W’ shall be taken as 0.5.
Question 7
Marks : +2 | -2
Pass Ratio : 14%
The value of shape factor S c, S q and S γ for circular base is _________
1.3, 1.2, 0.8
1.3, 1.2, 0.6
1.0, 1.0, 1.0
1.2, 1.0 and 1.3
Explanation:
According to IS (6403 -1981) standards, the shape factor for circle base is 1.3, 1.2 and 0.6 for S c, S q and S γ respectively.
Question 8
Marks : +2 | -2
Pass Ratio : 14%
The bearing capacity equation for strip footing as given IS standard, can be modified on the basis of ___________
Shape of the footing
Type of soil
Bearing capacity
All of the mentioned
Explanation:
The bearing equations applicable for strip footing shall be modified to take into account, the shape of the footings, and inclination of loading, depth of embankment and effect of water table.
Question 9
Marks : +2 | -2
Pass Ratio : 29%
For cohesion less soils, having c=0 Indian standard code recommends that the bearing capacity can be calculated based on __________
Relative density
Standard penetration resistance value
Static cone penetration
All of the mentioned
Explanation:
For cohesionless soils (c=0), Indian standard code recommends that the bearing capacity can be calculated i) based on relative density or ii) based on standard penetration resistance value, and iii) based on static cone penetration test.
Question 10
Marks : +2 | -2
Pass Ratio : 14%
IS code recommends a bearing capacity equation, which is similar to __________
Vesic
Meyerhof and Brinch Hansen
None of the mentioned
All of the mentioned
Explanation:
IS code (IS : 6403-1981) recommends a bearing capacity equation which is similar in nature to those given by Meyerhof and Brinch Hasen.