Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Civil Engineering Expert

problem 1: When a confined explosive charge is detonated in a blasthole, four events occur very rapidly but sequentially. Describe each of the four events briefly.

problem 2: An open pit blast consists of 120 vertical blastholes. Bench height is 10m and 1m of subdrilling is undertaken. The holes have 2.5m of stemming. Blasthole diameter is 200 mm, the burden is 6 m and spacing is 7 m. An emulsion explosive of specific gravity 1.1 is used. What is the powder factor? (Note consider the emulsion only, ie. do not consider primers)

problem 3: What is the importance of stemming in relation to blasting?

problem 4: Find the voltage required to detonate 40 electric detonators connected in series joined to 250m of firing cable with 50m of connecting wire. Resistances are as follows: average 2.2 ohms per detonator, 0.11 ohm per m of connecting wire and 0.04 ohms per m there and back for the twin core firing cable. Assume a DC supply is available.

problem 5: Determine the voltage and power input for a parallel firing circuit consisting of 25 detonators of resistance 1.6 ohms. The circuit is connected to 350m of firing cable of resistance 0.001 ohms.

problem 6: A new coal mining operation is to be worked employing surface mining using blasting to clear an overburden of Shale using 120mm holes and 13m benches. Dry rock conditions are anticipated and the decision is to use bulk ANFO with emulsion cartridges as a primer. A staggered drilling pattern with S = 1.15B is to be employed. If density of compacted ANFO = 0.85 g/cm3 and PF = 0.6 kg/m3, find out the burden and spacing.

problem 7: Describe the methods available for secondary blasting.

problem 8: For a schist orebody determine a ring drilling pattern assuming pneumatically loaded ANFO is used of density 0.9, in 56mm diameter blastholes of average length 11m. Detail any assumptions you make.

problem 9: Flyrock, airblast and ground vibrations are common problems in blasting, what methods can be used to minimise their impact both within the mine and to the population living in the area around a mine?

problem 10: Describe the construction of a typical electric detonator. Electric initiation of charges can be problematic in certain ore body types, why is this? What other methods of initiation of explosive initiation are available.

Civil Engineering, Engineering

  • Category:- Civil Engineering
  • Reference No.:- M98023

Have any Question? 


Related Questions in Civil Engineering

In all of our pattern recognition examples thus far we have

In all of our pattern recognition examples thus far, we have represented patterns as vectors by using "1" and "-1" to represent dark and light pixels (picture elements), respectively. What if we were to use "1" and "0" i ...

What are the ingredients of asphalt cutbacks what are the

What are the ingredients of asphalt cutbacks? What are the ingredients of asphalt emulsions? Name three uses of asphalt emulsion. Why is asphalt emulsion preferred over asphalt cutback?

Consider the gain plot in figure p12-68a find the transfer

Consider the gain plot in Figure P12-68. (a) Find the transfer function corresponding to the straightline gain plot. (b) Use MATLAB to plot the Bode magnitude of the transfer function. (c) Design a circuit that will real ...

A tunable tank circuit the rlc circuit in figure p12-81

A Tunable Tank Circuit The RLC circuit in Figure P12-81 (often called a tank circuit) has R = 4.7 kΩ, C = 680 pF, and an adjustable (tunable) L ranging from 64 to 640 μH. (a) Show that the circuit is a bandpass filter. ( ...

Two identical rollerseach of weight 90n are supported by an

Two identical rollers,each of weight 90N are supported by an inclined plane and a vertical wall as shown in fig., determine the reaction at the points of supports A,B,C assuming all the surfaces to be smooth. Also find t ...

Te force system consists of the force p - 300i 200j

The force system consists of the force P = - 300i + 200j + 150k lb and the couple C. Determine the magnitude of C if the moment of this force system about the axis DE is 800 lb · ft.

The force system acting on the machine part is equivalent

The force system acting on the machine part is equivalent to the single force R = 95i + 10j lb acting at O. Determine the force P and the distance b.

Is it possible to assign valid logic levels and noise

Is it possible to assign valid logic levels and noise margin boundaries so that a device with the following transfer characteristic would serve as an inverter? Briefly explain your reasoning

An inflatable backyard swimming pool is being filled from a

An inflatable backyard swimming pool is being filled from a garden hose with a flowrate of 0.12 gal/s. a. If the pool is 8 ft in diameter, determine the time rate of change of the depth of water in the pool. b. Suppose t ...

Literature reviewwhat is waste paper ashis a waste material

LITERATURE REVIEW What is Waste Paper Ash? Is a waste material collected from the Paper Industry How is it generated? Why I want to use it as replacement to cement ? Effect of strength & workability for WPA , FA, SA, WA ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen