COMPLETE BLASTING TERMINOLOGIES ( PART - 2 )
Cartridge - An individual closed shell, bag, or tube of circular cross section containing explosive material. Cartridge Count (Stick...
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Raghav Prasad Dubey
Apr 20, 20213 min read
COMPLETE BLASTING TERMINOLOGIES ( PART - 1 )
Air Blast - the airborne shock wave or acoustic transient generated by an explosion. Ammonium Nitrate - The ammonium salt of nitric acid...
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shivank pandey
Apr 19, 20211 min read
Over Riding Of The Pillars
If there is hard sand stone in the roof or if roof does not comes down timely and hanging at roof at long time these type of hanging roof...
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shivank pandey
Apr 19, 20212 min read
Phenomenon of Air Blast In UG Mine :
When a roof fall takes place, the air in the goaf area is displaced as the latter is filled by the broken roof rocks. The displacement is...
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shivank pandey
Apr 19, 20211 min read
Bumps In Coal Mine :
Bumps in Coal Mines: Coal bumps generally occur in deep mines. These are sudden violent bursts of coal from pillars, usually accompanied...
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shivank pandey
Apr 19, 20211 min read
Indication of Roof Weight :
The indications available of roof weight are coming down over mine opening can be sense by - 1. The prop, when tapped with a stick,...
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shivank pandey
Apr 19, 20211 min read
Local Fall & Main Fall :
Local Fall - This is also called as first roof fall. In this type of fall the lower strata of immediate roof separate and fall in the...
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shivank pandey
Apr 19, 20211 min read
Normal Collapses & Premature Collapses :
While working with caving system in depillaring district roof falls after some time when supports are withdrawn from the faces, this type...
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Abhishek Sahu
Apr 18, 20211 min read
CONTROLLED BLASTING (open cast)
Production blasting is designed to fragment rock for loading. At the slope wall, this fragmentation results in backbreak, which reduces...
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Siddharth Urmaliya
Apr 18, 20211 min read
Bore HOLE Deviation
Bore Hole Deviation Deviation from required/set course of action known as Bore Hole Deviation . It is significant when it's more than >2⁰...
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Siddharth Urmaliya
Apr 17, 20211 min read
ROCK BREAKAGE
Chapman-Jouquet plane for Rock Breakage 🪨 🪨 🪨 🪨🪨 🪨 🪨 🪨 The space is Bounded by two infinite planes. Exploded region(shock wave)...
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Prashant prajapati
Apr 16, 20211 min read
What is PRODUCTIVITY, it's Meaning and Measurement
PRODUCTIVITY pro·duc·tiv·i·ty Latin Origin /ˌprōˌdəkˈtivədē Productivity is the commonly relation between the output volume and the...
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Ankit kerketta
Apr 12, 20212 min read
Flameproof & Intrinsically safe Apparatus
•Flameproof Apparatus:- Flameproof Apparatus means an electrical apparatus - whose electrical parts that can ignite an explosive...
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Prashant prajapati
Apr 11, 20211 min read
HEINRICH THEORY About MINES ACCIDENTS
Heinrich Theory In 1931, H.W. Heinrich was the first who view mine accidents in scientific way. He analysed some 75000 accidents and give...
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shivank pandey
Apr 10, 20211 min read
What is line of Extraction ?Types and their reasonable Factors !
Line of extraction is the line or plane along which the roof breaks occurs easily when the depillaring or coal pillar are extracted....
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Ankit kerketta
Apr 9, 20211 min read
Roof Bolt Principles
•Bolt acts on the basis of three principles:- 1) Suspension effect:-. The immediate layers of roof are held by anchorage(लटकाना) from a...
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Abhishek Sahu
Apr 9, 20211 min read
WATER HAMMER
When a moving coloum of water is suddenly come to rest then it begins to stroke the various of the pump. The pump is liable to brake...
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![Coward's Diagram [methane explosibility curve]](https://static.wixstatic.com/media/bdbf57_f1e3829e4500494eb271b4a3f5862f53~mv2.png/v1/fill/w_881,h_662,fp_0.50_0.50,q_95,enc_auto/bdbf57_f1e3829e4500494eb271b4a3f5862f53~mv2.png)
Raghav Prasad Dubey
Apr 9, 20212 min read
Coward's Diagram [methane explosibility curve]
Methane Explosibility Curve If you want to find out the flammability of methane-air mixtures, explosibility curve of methane is extremely...
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Raghav Prasad Dubey
Apr 9, 20212 min read
MINE FAN - AXIAL FLOW FAN
AXIAL FLOW FAN It consists of a shaft with a hub (Boss). A number of blades are attached to the hub. The salient constructional features...
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Apr 9, 20211 min read
BLOWN OUT SHOT
BLOWN OUT SHOT A shot in which the explosive brings down no coal, the main force being expended on the air of the mine BLOWN OUT SHOT...
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