This set of Geotechnical Engineering Questions and Answers for Aptitude test focuses on “Construction of Under-Reamed Pile Foundation”.
1. The equipment required for construction of a under-reamed pile is________
a) Auger boring guide
b) Spiral auger
c) Concreting funnel
d) All of the mentioned
View Answer
Explanation: The equipment required for the construction of pile are i) Auger boring guide ii) spiral auger with extension rods iii) under-reamer with soil bucket and iv) concreting funnel.
2. The use of bore guide in under-reamed pile foundation is essential for __________
a) To drill the bore hole
b) To provide a support to the pile
c) To keep the bore holes vertical
d) To set the guide assembly in position
View Answer
Explanation: The used of boring guide is essential in order to keep the bore holes vertical and also in its position.
3. Which of the following stages are involved in the construction of under reamed piles?
a) Concreting of piles and Boring by auger
b) Concreting the funnel
c) None of the mentioned
d) All of the mentioned
View Answer
Explanation: The various stage involved in the construction of under reamed pile foundation are i) boring by auger ii) under-reaming by under-reamer iii) placing reinforcement cage in position iv) concreting of pile caps, plinth beams and curtain walls.
4. The depth of the bore hole is checked at _________ before insertion of the under-reamer.
a) At the start and At the end
b) Each time
c) None of the mentioned
d) All of the mentioned
View Answer
Explanation: The depth of the bore hole is checked each time before insertion of the under-reamer so that any loose earth spilled from the bucket is removed.
5. Routine tests are usually carried out on _________
a) Test piles
b) Working piles
c) None of the mentioned
d) All of the mentioned
View Answer
Explanation: Routine test should be carried out on test piles while initial test are preferably carried on test piles.
6. In the process of pile foundation, boring is done with the help of _________
a) Boring guide
b) Under-reamer
c) Spiral auger
d) Pile beams
View Answer
Explanation: Boring is done with the help of spiral auger, present at the circular collar of the guide assembly.
7. Enlarging the stem of bore hole at the depth is done by using________
a) Spiral auger
b) Under-reamer
c) Boring guide
d) None of the mentioned
View Answer
Explanation: Under-reaming or enlarging the stem of bore hole at the required depths is achieved by means of the under-reamer consisting of a set of two collapsible blade assembly.
8. For completion of one under-ream, how many buckets of earth are required for removal?
a) Five
b) Ten
c) Eight
d) Three
View Answer
Explanation: Generally, removal of eight buckets full of earth is required for completion of one under-ream.
9. Pile groups in under-reamed pile foundation can be tested by means of _________
a) Free standing piles and Pile foundation
b) Cannot be tested
c) None of the mentioned
d) All of the mentioned
View Answer
Explanation: Pile groups may be tested as both free standing piles or piled foundation by applying series of load.
10. The dimension of the bulb in an under-reamed pile can be checked by __________
a) Meter scale
b) G.I pipe assembly
c) Auger
d) Under-reamer
View Answer
Explanation: The dimensions of the bulb can be checked by means of a graduated G.I. pipe assembly.
Sanfoundry Global Education & Learning Series – Geotechnical Engineering.
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