A Study of Energy in Rock Blasting

Rajput, Ashish (2016) A Study of Energy in Rock Blasting. MTech thesis.

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Abstract

Creation impacts have been observed in quarry so as to evaluate the quantifiable structures of energy in which the energy conveyed by the unstable is changed in rock impacting. The seismic field from Minimate readings, the introductory speed of the impacted rock face acquired utilizing Gurney condition, and the section size disseminations from picture investigation of the muckpile material are utilized to decide the seismic wave energy, the Kinetic energy and the Fragmentation energy, individually, moved in the impacting procedure. The impacting information and the techniques for figuring of the energy terms from those are depicted in subtle element. The most extreme aggregate energy measured records for not more than 26% of the accessible dangerous energy in the event that this is appraised as the warmth of blast, however lower figures are normally acquired. Sample of iron ore collected for laboratory experiment to find out the fragmentation energy with the help of “WipFarg Software (used for sieving of different rock sizes)”, drilling and blasting data, average size of fine and coarser particles, data for ppv to find out seismic energy, also Gurney equation for calculation of kinetic energy The energy discharged by the explosive, borne in the detonation endless supply of the chemical reaction, is changed over into heat and work to the surroundings as indicated by the first principle of thermodynamics.

Some of these structures get to be obvious amid the impact, to be specific:
• the fracture work, that eventually shows up as new surface in the rock fragments;
• the work exchanged as shock wave into the rock, that proliferates as plastic and at last elastic waves, showing up as seismic wave or ground vibration; and
• the work to uproot the rock and shape the muckpile, that shows up as kinetic energy conferred to the rock.
Other energy exchange happens, in a less evident manner, as takes after:
• expansion work of the fractures, that is consumed as elastic and plastic miss happening of the rock in the surface of the fractures as they are infiltrated by the gasses;
• heat exchanged to the rock from the hot detonation items; and
• heat and work passed on as enthalpy of the gasses venting to the air through open fractures and stemming.
The energetic analysis provides a good insight of the explosive/rock interaction and a better understanding of the blasting process, encompassing a broad range of scientifically challenging subjects .For each energy component, first of all some experiments have been carried out in laboratory and some data collected from Iron Ore Mine to find out some results for different energy. Then with the help of some software and some equations from literature helped me to do my project work with efficiency. Energies ratios with respect to the total explosive energy are: Fragmentation energy is 31.45%, seismic energy is 1.69%, kinetic energy 13.599%. Total explosive energy measured is equal to 2.434 GJ

Item Type:Thesis (MTech)
Uncontrolled Keywords:Fragmentation energy; Seismic energy; Kinetic energy; Rittinger’s law; Explosive energy; Heat and work; Shock wave
Subjects:Engineering and Technology > Mining Engineering > Surface Blasts
Engineering and Technology > Mining Engineering > Mining Geomechanics
Divisions: Engineering and Technology > Department of Mining Engineering
ID Code:8118
Deposited By:Mr. Sanat Kumar Behera
Deposited On:21 Dec 2017 21:09
Last Modified:21 Dec 2017 21:09
Supervisor(s):Mishra, Manoj Kumar

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