Method of blasting multiple layers or levels of rock

A rock formation and blasting hole technology, applied in blasting, earth-moving drilling, surface mining, etc., can solve problems such as unproven substantial improvements, and achieve the effect of reducing possibility and improving productivity

Inactive Publication Date: 2006-12-27
ORICA EXPLOSIVES TECH PTY LTD
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  • Abstract
  • Description
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Problems solved by technology

The paper also notes that, according to theory, introducing a blast delay time between the coal pillar and the intervening rock formation would improve the results and reduce coal contamination, but experimental work investigating the theory did not demonstrate any substantial improvement

Method used

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  • Method of blasting multiple layers or levels of rock
  • Method of blasting multiple layers or levels of rock
  • Method of blasting multiple layers or levels of rock

Examples

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Embodiment approach

[0070] Referring to the accompanying drawings, various implementations of the blasting method of the present invention are only introduced by way of example, wherein:

[0071] figure 1 Shown is the general idea of ​​the inventive method;

[0072] figure 2 Shown is a first specific embodiment of the method of the invention;

[0073] image 3 Shown is a second particular embodiment of the method of the invention;

[0074] Figure 4 Shown is a third specific embodiment of the method of the invention;

[0075] Figure 5 Shown is a fourth particular embodiment of the method of the invention;

[0076] Figure 6a and 6b shown in accordance with Figure 5 Plan and cross-sectional views of the blasts described in examples of the illustrated embodiments;

[0077] Figure 7 Shown is a kind of blasting method of the present invention, and it has obtained differential crushing result;

[0078] Figure 8 is similar to Figure 6a , but belongs to another blasting method of th...

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Abstract

A method of blasting plural layers of material (38, 40, 42, 44) in a blastfield (16) that reduces the amount of mechanical excavation required to expose a lower layer of material. The method includes using rows of equally spaced blastholes (18, 20, 22, 24) that pass through all of the layers and additional intermediate rows of blastholes (26, 28) that pass down only through top layer (40). Each blasthole is capped with stemming material and includes one or more decks of explosives material (46) and detonators (48), with air decks or inert stemming (45) separating adjacent explosives decks (46). The detonators in layer (40) are detonated first in order from row (18) rearwards to throw a substantial amount of the blast material from layer (40) forwardly of free face (12) onto floor (34). In the same blasting cycle and within seconds of the throw blast, explosives material in layers (42, 44) is detonated in a stand-up blast in which material in layers (38, 42, 44) is broken up but otherwise minimally displaced or thrown forwardly. Layers (38, 44) may be coal seams which are separated by interburden layer (42) and covered by overburden layer (40).

Description

field of invention [0001] The present invention relates to a method of blasting and in particular to a method of blasting away layers or levels of rock in mining operations, including layers containing regolith and / or recoverable minerals, such as coal seams. Background of the invention [0002] In surface mining operations, current practice typically involves several rounds of drilling and blasting, blasting away layers of material such as regolith or "toprock" (overburden and intermediate rock formations) and coal. Similar practices are sometimes applied to mining metal ores. Where appropriate, the present invention will use the term "recoverable minerals" in the description to include coal, metal ores and other valuable recoverable materials. For metallic ores, the thickness of the blasted layer often depends on equipment requirements rather than on mineral formation. However, the principles described here for blasting multiple rock formations apply equally to this situ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D3/04F42D1/08E21C41/28F42D1/02
CPCF42D3/04F42D1/055
Inventor G·布伦特T·戈斯瓦密
Owner ORICA EXPLOSIVES TECH PTY LTD
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