An explosives requires a shock to initiate (detonate) how is this achieved with a commercial explosive? 

2.  What is a primer?

3.  What are the three broad categories of high explosives?

4.  What are the three types of commercial explosives available in South Africa? 

5.  Are commercial explosives, primary, secondary or tertiary explosives?

6.  What are the three types of tertiary explosives available in South Africa?

7.  Draw a diagram of a cartridge of explosive.

8.  How are cartridged commercial explosives supplied by the manufacturers to the mines? I.e. how are they packaged? 

9.  How is ANFO supplied to underground mines?

10. What is a Blasting Agent?

11. What is the purpose of the UN tests for a blasting agent?

12. What are the three UN tests for a blasting agent?

13. Describe the three UN tests for a blasting agent?

14. Describe the composition of a watergel explosive 

15. Describe the composition of an emulsion explosive

16. How are watergel explosives sensitised?

17. How is an emulsion explosives sensitised?

18. What is a Mobil Manufacturing Unit (MMU)?

19. What is Heavy ANFO?

20. What is a Doped Emulsion explosive?

21. What is the difference between a heavy ANFO and a Doped Emulsion?

22. What is a "permitted " explosive and where MUST it be used?

 An explosives requires a shock to initiate (detonate) how is this achieved with a

commercial explosive? 

2.  What is a primer?

3.  What are the three broad categories of high explosives?

4.  What are the three types of commercial explosives available in South Africa? 

5.  Are commercial explosives, primary, secondary or tertiary explosives?

6.  What are the three types of tertiary explosives available in South Africa?

7.  Draw a diagram of a cartridge of explosive.

8.  How are cartridged commercial explosives supplied by the manufacturers to the

mines? I.e. how are they packaged? 

9.  How is ANFO supplied to underground mines?

10. What is a Blasting Agent?

11. What is the purpose of the UN tests for a blasting agent?

12. What are the three UN tests for a blasting agent?

13. Describe the three UN tests for a blasting agent?

14. Describe the composition of a watergel explosive 

15. Describe the composition of an emulsion explosive

16. How are watergel explosives sensitised?

17. How is an emulsion explosives sensitised?

18. What is a Mobil Manufacturing Unit (MMU)?

19. What is Heavy ANFO?

20. What is a Doped Emulsion explosive?

21. What is the difference between a heavy ANFO and a Doped Emulsion?

22. What is a "permitted " explosive and where MUST it be used?

    

Transcribed Image Text:

Question 1 1.1 (Excavation Support) 5m Sandstone 0.75 m Slate (Density - 2750 kg/m²) 1.25m Shale (Density-2450 kg¹) An excavation of span (s) 5.5 m is made in a coal seam. The roof above the excavation comprises of rocks as shown in the Figure above. Assume g = 10 m/s2. If the capacity (F) of each individual bolt is 225 kN and the FOS is 1.7. calculate the number of bolts (n) per line. Assume the spacing (b) between the rows to be 2 m. Formulae: W = pgtsb FOS = n.FM 1.2 (Mechanical Properties of Rock) A standard rock specimen underwent a laboratory Uniaxial Compressive Strength (UCS) Test. The following information was recorded: Force at Failure = 175 kN (150 000 N) Specimen original length = 105 mm Specimen original diameter = 42 mm Axial strain (at half UCS) = 0.6548 x 10-3 Lateral strain (at half UCS) = -0.1519 x 10-3 Determine: i) Uniaxial Compressive Strength (Stress at failure) of the rock ii) Elastic Modulus of the rock iii) Poisson's Ratio of the rock Formulae: o=F/A E = a/e v=eV/ca (5) (2) (1) Question 1 1.1 (Excavation Support) 5m Sandstone 0.75 m Slate (Density - 2750 kg/m²) 1.25m Shale (Density-2450 kg¹) An excavation of span (s) 5.5 m is made in a coal seam. The roof above the excavation comprises of rocks as shown in the Figure above. Assume g = 10 m/s2. If the capacity (F) of each individual bolt is 225 kN and the FOS is 1.7. calculate the number of bolts (n) per line. Assume the spacing (b) between the rows to be 2 m. Formulae: W = pgtsb FOS = n.FM 1.2 (Mechanical Properties of Rock) A standard rock specimen underwent a laboratory Uniaxial Compressive Strength (UCS) Test. The following information was recorded: Force at Failure = 175 kN (150 000 N) Specimen original length = 105 mm Specimen original diameter = 42 mm Axial strain (at half UCS) = 0.6548 x 10-3 Lateral strain (at half UCS) = -0.1519 x 10-3 Determine: i) Uniaxial Compressive Strength (Stress at failure) of the rock ii) Elastic Modulus of the rock iii) Poisson's Ratio of the rock Formulae: o=F/A E = a/e v=eV/ca (5) (2) (1)

Answer rating: 100% (QA)

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