Rock Fragmentation — Winter 2023

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

Explain delay detonators and its advantages with neat sketch.

Describe blast design parameters in details.

Differentiate between low explosive & high explosive with suitable examples.

Discuss the properties of explosive in detail.

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

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

Make a tree diagram of classification of drilling methods. Also write the factors affecting the selection of drill machine.

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

Relative weight strength of an unknown explosive is 1.5 times of ANFO in Jules/gm. Absolute strength of TNT is 4000 Jules/gm. TNT has relative bulk strength of times of the ANFO in Jules/cm3. If the specific gravity or density of ANFO, TNT and unknown explosive 0.9, 1.5 and 1.2 respectively. Determine the absolute strength of unknown explosive in Jules/gm and Jules/cm3.

Compare rotary drilling method with percussive drilling method.

Discuss the construction and operation of wagon drill machine.

Write the purpose of control blasting methods? Explain any two method of control blasting in detail.

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

Write a short note on VOD probe.

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.

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.1

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

Write are the application of image analysis technique in mining? Also name the software used for the same.

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.

Calculate the powder factor, if the bench height is 7.5 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.

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