This set of Geotechnical Engineering Assessment Questions and Answers focuses on “Uncased Cast-in-Situ Concrete Piles”.
1. Which of the following is an advantage of using uncased cast-in-situ piles?
a) They need no storage place
b) The concrete cannot be damaged by driving
c) Special equipment is not required
d) All of the mentioned
View Answer
Explanation: The uncased piles have the advantage that i) They need no storage place ii) they do not require cutting off excess length iii) do not require special equipment and iv) the concrete is not liable to damage from driving.
2. The types of uncased piles used are __________
a) Swage pile
b) McArthur cased pile
c) Simplex pile
d) All of the mentioned
View Answer
Explanation: The following are the common types of uncased cast-in-situ concrete piles:
i) Simplex pile
ii) Vibro pile
iii) Franki pile
iv) Padestal pile.
3. The uncased cast-in-situ piles can be used only in the condition, where _______
a) Water should not fall in the hole and Adjacent pile will not damage the concrete
b) Seasonal condition change
c) None of the mentioned
d) All of the mentioned
View Answer
Explanation: The uncased piles are used only where it is certain that neither soil nor water will fall in to the hole after withdrawing a driven mandrel or shell and also where adjacent pile will not damage the green concrete.
4. In Franki pile foundation, the bottom of the pile is provided in the shape of _________
a) Spherical
b) Mush-room
c) Cone
d) Rectangular
View Answer
Explanation: The Franki pile has an enlarged base of mush-room shape, which gives the effect of a spread footing.
5. Which of the following pile is used, when the ground is soft?
a) Franki pile
b) Simplex pile
c) Vibro-piles
d) Pedestal piles
View Answer
Explanation: Vibro-piles are used where the ground is shaft, thus offering little frictional resistance to the flow of concrete.
6. The bearing capacity of vibro-pile can be increased by ________
a) Increasing its diameter
b) Elongation of the pile
c) By using cone-shape base at the bottom
d) By adding more load
View Answer
Explanation: The bearing capacity of vibro-expanded piles is increased by enlarging its diameter at the bottom.
7. If tamping of concrete is provided at regular intervals in a simplex pile, it is called as ________
a) Simplex standard pile
b) Simplex tamped pile
c) Tamped standard pie
d) None of the mentioned
View Answer
Explanation: In a simplex tamped pile, tamping of green concrete is done after the casing is withdrawn, at regular intervals.
8. The base of an vibro-pile should be in the shape of ___________
a) Conical shoe
b) Mushroom
c) Sphere
d) Rectangle
View Answer
Explanation: The bottom of a vibro-pile is provided with a conical shoe so that it can be easily driven up to the desired depth.
9. In which of the following piles, alligator jaw point can be used?
a) Vibro-pile
b) Pedestal pile
c) Franki pile
d) Simplex pile
View Answer
Explanation: In simplex pile if the soil is firm enough to stand, the cast iron shoe at the base is provided with alligator jaw point.
10. Franki piles are best suited for _________ type of soil.
a) Cohesive soil
b) Clay
c) Granular soil
d) Cohesion less soil
View Answer
Explanation: Franki pile is more useful where a bearing stratum of limited thickness can be reached at a reasonable depth, so they are best suited for the granular type of soil.
Sanfoundry Global Education & Learning Series – Geotechnical Engineering.
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