ENGIN5514: Production Drilling and Blasting Design Project - Engineering Assignment Help

Assignment Task:

TASK:

Question 1: Calculate the total drilling per month (15 marks) and drilling rate per minute (5 marks) from the following information: Spacing of the drill holes: 5 m Burden of the drill holes: 4 m Overburden to be removed per month: 200,000 m3 Hours scheduled per shift: 6 Shifts per day: 1 Drilling days per week: 5 Weeks worked per month: 2 Number of drilling units: 2

Question 2: How many drilling units are required to meet the overburden-preparation requirements of a surface mine, if the following information is provided (20 marks)? Spacing of the drill holes: 7 m Burden of the drill holes: 5 m Overburden to be removed per month: 500,000 m3 Hours scheduled per shift: 6 Shifts per day: 2 Drilling days per week: 5 Weeks worked per month: 3 Drilling rate: 20 meters per hour

Question 3: A house located at 300 meters from blast site, needs to be protected. Determine how much maximum explosive charge (20 marks) can be used to protect the house from blasting using square root scaled distance equation. The house can sustain blast vibration level upto 5 mm/s. Assume K: 690.84 and b: 1.65 Determine how much explosive charge can be used to protect the house, if it is 500 meters away from blast site (10 marks).

Question 4: At an urban quarry, a drill and blast contractor has to produce +/-20,000 tonnes of blasted sandstone (2.70 t/m3), which will be fed to a 30 x 42 jaw crusher. The bench height is 15m and they use a hydraulic drill rig with 76mm drill bits. To obtain the required fragmentation, history has indicated that a powder factor of 0.80 or greater is required. Assume an explosive density of 1.2 g/cc. Calculate the following:

a. No. of holes required (10 marks)

b. Total explosives required (10 marks)

c. A building is 500m from the blast. If the maximum mass charge per delay is 250kg, what is the greatest number of shot holes which can be detonated at the same time (15 marks)?

Question 5: Students are to undertake a tunnel blast design for the following conditions:

• Tunnel is 5.5 m wide by 5.5 m high

• Rock is granite with a UCS of 300 MPa

• Drill hole diameter is 51 mm, hole length is 4 m

• The cut is to contain 2 relief holes of 75 mm diameter

• Dry conditions are anticipated, ANFO to be used with a density of 800 kg/m3 and a powder factor of 0.6 kg/m3

• Nonel detonators are to be used

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