Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
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Subject Code: 2172207 Date: 30/11/2019
Subject Name: Rock Fragmentation
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain the purpose of drilling & factors influencing the selection of drill machine. [03]
(b) Discuss the type of drilling methods based on their principle of working. [04]
(c) Define drillability and explain the four phases of rock breakage during percussive drilling. [07]
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Q.2 (a) Write a note on ANFO explosive. [03]
(b) Explain the principle of operation of jack hammer drill used in underground coal mining. [04]
(c) Define explosive & its basic composition. Briefly explain the properties of explosive. [07]
OR
(a) Explain different types of drill bits used in drilling with neat sketch. [07]
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(b) Differentiate between low explosive & high explosive with suitable examples. [03]
(c) Write a note on down the hole hammer drill machine. [04]
Q.3 A project in granite rock will have an average bench height of 20 feet. An explosive having a specific gravity of 1.2 has been proposed. A drill machine can easily drill 3.0 inch diameter of holes. Assume diameter of explosive will be 2.5 inch and delay blasting technique will be used. Develop a blast design for the project. Take specific gravity of granite is 2.8. [07]
OR
(a) What do you mean by safety fuse and detonating fuse? [03]
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(b) Differentiate between the term slurry explosive and emulsion explosive. [04]
(c) What are the blast design parameters? Explain briefly. [07]
Q.4 (a) Explain permitted explosive and’its type [03]
(b) What are electric and non-electric methods of blasting system? [04]
(c) Write note on Hydraulic Drilling and Long Hole Drilling. [07]
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OR
(a) Write a note on wagon drill machine. [03]
(b) Explain delay detonator and its type with neat sketches. [04]
(c) What do you mean by powder factor? [07]
Q.5 Calculate the powder factor, if the bench height is 6.5 m, subgrade drilling is 0.3 m, stemming height is 1.5 m, burden is 2 m and spacing is 3 m. Take specific gravity of explosive is 1.2 and loading rate of explosive per meter is 7.5 kg. [07]
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OR
(a) What do you mean by boring in rocks? [03]
(b) Write the advantage and disadvantage of delay blasting technique. [04]
(c) Explain the recent developments in explosive and blasting techniques. [07]
OR
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(a) Write a short note on nuclear blasting. [03]
(b) Explain novel methods of drilling. [04]
(c) What is ground vibration and air blast? Explain its causes and impacts. [07]
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