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The new calculated device consumption of explosives expands towards raise out of rock stiffness

The new calculated device consumption of explosives expands towards raise out of rock stiffness

Approach based on accurate lithology shipment

In the process of rock blasting, brand new real and you will physical attributes of your own stone are undoubtedly one of your own main factors that determine the end result regarding rock blasting 21 . Discover have a tendency to a vague realizing that the brand new more challenging this new material, the fresh harder it’s to-be blasted in the modern systems community. But not, the blasting impact isn’t exactly as expected during the technologies strategies. As an alternative, it has been learned that this new stiffness of material is not higher due to the fact device usage of explosives try higher twenty-two .

According to breaking method from stone blasting 23 , the ability released by explosives acts into rocks by the treat trend and you may expansion tension of detonation energy whenever an explosive explodes with the rocks. The ultimate destruction from rocks is because of the action stress produced by the latest explosion exceeding their electricity limit, and that indicates that the crushing condition are directly associated with the fresh rush energy therefore the mechanized qualities of one’s stone. This basically means, within the particular standards off equipment explosive use means, type, and you can 100 % free facial skin, this new charge numbers is mainly influenced by the new technical attributes from rock to get to a certain crushing effect. Therefore, new lithology shipments is the no. 1 reason behind determining the latest tool usage of explosives 24 .

Inside an in-depth study of the latest lithology out of hard-rock, it is discovered that large worry has a significant impact on new blasting techniques and you will material breaking effect. The outcomes plus demonstrate that highest-website worry handling and you can blasting loading aren’t a couple independent techniques, to the contrary, they work inside the cooperation, and the active handling features a serious impact twenty-five . Hence, this new distribution from hard rock is the vital thing for the design off an excellent segmented fees having blasthole.

Grouping out-of blasthole stone strata

Regarding the old-fashioned blasting procedure, the fresh new lithology huge difference over the great time opening depth is not thought regarding blasting construction. Hence, one costs framework was then followed. Regarding superimposed rock bulk having flaccid and difficult inclusions, the fresh weakened interlayer’s compressing and you may tensile resistance energy are very reasonable compared with you to definitely about complex material formations, nearly negligible. During the time, the fresh weakened interlayer can end up being the overflow channel of your detonation energy and weaken the fresh crushing and you can putting aftereffect of the high-pressure fuel generated by the fresh burst. While doing so, regarding large hard rock in the place of rush splits, it is difficult to break sizeable stones making use of the supplementary crushing concept away from block rock crash throughout the putting process due so you’re able to a failing interlayer twenty-six . Thus, brand new department from soft-rock and hard rock is a vital step from the framework strategy.

The lithology data of the corresponding blastholes are obtained by intelligent drilling rigs. According to the hardness of the lithology, the blasthole rock strata are divided into 7 categories, and lithology classification numbers range from Type 1 to Type 7 27 . In order to facilitate the design and calculation of blasthole charge structure, the adjacent strata with similar lithology are combined and grouped. The lithology is divided into two groups of soft rock and hard rock, denoted as \(s\) and \(h\) , respectively. The classification rule of soft rock and hard rock is that the strata numbered 1, 2, 3, and 4 are soft rocks, and rock strata numbered 5, 6, and 7 are hard rocks. The grouping diagram of blasthole rock strata is shown in Fig. 4: H refers to the blasthole depth, Rs means the thickness of soft rock, and Rh means the thickness of hard rock.

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