Geotechnical Engineering

Load on Positive and Negative Projecting Conduits

Question 1
Marks : +2 | -2
Pass Ratio : 50%
Critical plane in conduit is located at ___________
Tangential to the top of the conduit
Tangential to the bottom of the conduit
Centre of the conduit
All of the mentioned
Explanation:
The critical plane is a horizontal plane, located tangential to the top of the conduit.
Question 2
Marks : +2 | -2
Pass Ratio : 50%
The load on a negative conduit is given by the equation __________
Wc = Cn γ Bd
Wc = Cn γ Bd2
Wc = γ Bd
Wc = Cn Bd2
Explanation:
The load on the conduit is given as WC = Cn γ Bd2, where Cn= load coefficient for negative projecting conduit.
Question 3
Marks : +2 | -2
Pass Ratio : 50%
If the plane of settlement does not fall within the embankment, then such a condition is called _________
Complete ditch condition and Complete project condition
Incomplete ditch condition
None of the mentioned
All of the mentioned
Explanation:
If the embankment is not of sufficient height, the plane of equal settlement does not fall within the embankment (i.e., He > H); such a condition is called complete projection condition or complete ditch condition.
Question 4
Marks : +2 | -2
Pass Ratio : 50%
The settlement ratio for a negative projecting conduit is __________
Always positive
Always negative
Negative in some cases
None of the mentioned
Explanation:
The settlement ratio for negative projecting conduits is always negative since the settlement of the critical plane is more than the settlement of the natural ground.
Question 5
Marks : +2 | -2
Pass Ratio : 50%
Positive projecting conduits are of ___________ types.
2
5
3
4
Explanation:
Positive projecting conduits are of four types: i) complete ditch conditions ii) complete projection conduits iii) incomplete ditch conduit iv) incomplete projection conduits.
Question 6
Marks : +2 | -2
Pass Ratio : 50%
The sign used for complete projection is __________
+
–
No sign is used
None of the mentioned
Explanation:
Since + is used for positive settlement ratio, (+) sign is used for complete projection and (–) sign used for complete ditch condition.
Question 7
Marks : +2 | -2
Pass Ratio : 50%
If the critical plane settles more than the top of the conduit, the settlement ratio is __________
Zero
Negative
Positive
Unity
Explanation:
If the critical plane settles more than the top of the conduit i.e. if (sm + sg) is more than (sf + dc) the settlement ratio is positive.
Question 8
Marks : +2 | -2
Pass Ratio : 50%
Both the projection condition and the ditch conditions of a positive projecting conduit may be __________
Complete
Incomplete
All of the mentioned
None of the mentioned
Explanation:
Depending upon the position of plane of equal settlement, both the projection conditions and the ditch conditions of a positive projecting conduit may be complete or incomplete.
Question 9
Marks : +2 | -2
Pass Ratio : 50%
The magnitude and direction of relative movements between the interior and exterior prisms of the conduits are dependent upon the ___________
Settlement ratio
Projection ratio
Settlement of conduits
Compressive strain
Explanation:
The magnitude and direction of relative movements are dependent upon the settlement ration rsd defined by the equation:
Question 10
Marks : +2 | -2
Pass Ratio : 50%
The recommended value of settlement ratio for embankment, to use in design is __________
+0.5
+1.0
– 0.3
– 0.4
Explanation:
The value of rsd for embankment of rigid conduit type is +1.0, which can be used for any ordinary rock hard, hard or unyielding soil as foundation soil.