Rock Fragmentation — Summer 2024

Draw the line diagram or sketch of components of drilling equipment & name the components.

Explain delay detonators and its advantages with neat sketch

Discuss the properties of explosive in detail.

Name the factors affecting the selection of drill machines.

Differentiate between low explosive & high explosive with suitable examples.

What is mechanics of drilling? Explain the mechanism of rock breakage by percussive drilling with neat sketch.

Write a short note on stoper and drifter. Also discuss the construction and operation of wagon drill machine.

Make a tree diagram of classification of drilling methods.

Discuss the principle and operation of “jack hammer” drill machine used in underground coal mining.

Define powder factor with its importance in blasting? Calculate the powder factor (kg/m3 ) from below data :- (i) Bench Height – 12 m (ii) Hole Dia. – 170 mm and amount of explosive loaded in blast hole = 11.5 kg/m. Assume the parameters if required.

Compare rotary drilling method with percussive drilling method.

Discuss the blast design pattern using in surface mine with neat sketch.

Why control blasting methods are used in mines? Explain any two method of control blasting in detail.

Explain the importance of permitted explosive in underground coal mines. Also write its type.

What is VOD and how it is determined?

Calculate the powder factor in tonne/kg from below data:  Bench height including subgrade drilling = 10 m  Burden = 4 m  Spacing = 5 m  Subgrade drilling = 0.5 m  Stemming length = 3 m If the diameter of the hole is 200 mm and density of explosive and rock is 0.9 tonne/m3 and 2 tonne/m3 respectively.1

Explain the application and importance of high speed video camera in mining.

Why drillability is important? Also write the factors affecting the drillability of rock.

Discuss the causes and Impact of ground vibration and air blast on the neighboring structures and communities. Also explain its mittigative measures.

What are the advantages of using image analysis technique for fragmentation analysis of a muckpile?

What do you mean by penetration rate and how it is determined in the mine? Explain with one example.

What is secondary blasting? Explain its types in detail.

Differentiate between the term slurry and emulsion explosive.

Write a short note on bit wear.

Discuss the blast design pattern using in underground mine with neat sketch..