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smooth blasting presplit

CHAPTER 3 – ROCK EXCAVATION METHODS BLASTING

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As with presplit holes, smooth blasting holes are smaller than production holes in order to limit fracturing around the drill hole.

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Aesthetic Blasting - Rock Excavation Techniques | GeoPrac.net

Smooth Blasting. In presplit blasting, the slope is defined by carefully aligned blast holes, containing light charges, which are fired prior to the detonation of ...

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18 Blasting damage in rock - Rocscience

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face created by presplit blasting in jointed gneiss. It is evident that, ... smooth blasting is preferred to pre-split blasting for tunnelling operations.

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A better way to presplit - Mining & Construction online

... slopes that are close to the planned angle of the final pit wall and benches that are smooth and ... in order to obtain a good result with the presplit blast.

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PRESPLIT BLASTING FOR OPEN PIT MINES

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PRESPLIT BLASTING FOR OPEN PIT MINES D P Francis ... These techniques are namely smooth wall blasting (or trim blasting), line drilling, cushion blasting, ...

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11D Rock Blasting 5-6-08 - Kentucky Transportation Cabinet - KYTC

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rock cut faces using presplit blasting and production blasting techniques. 2.0 MATERIALS. ... Perform presplitting to obtain smooth faces in the rock and shale ...

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Application Ofpresplitting And Smooth Blasting For Excavation Of …

Better results were reported with smooth blasting when compared to presplitting during ... when they were at an angle of I to 30 degrees to the presplit ...

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Improved Blasting and Bench Slope Design at the Aitik Mine

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For the footwall, presplit blasting in inclined (70°) holes over the full double-bench height, proved to be ... A lighter smooth blasting pattern was tested in the

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Aesthetic Blasting | GeoPrac.net

Smooth Blasting. In presplit blasting, the slope is defined by carefully aligned blast holes, containing light charges, which are fired prior to the detonation of ...

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05/10_Rock Excavation Handbook / General Contracting

The two methods are: - Smooth blasting - Presplitting Presplit blasting differs from smooth blasting in that it is performed before the primary blast is detonated; ...

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K CONTROLLED BLASTING - USM :: Universiti Sains Malaysia

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The presplit shots transmit compressive shock waves, which, at their point of meeting between the boles, create a zone of ... known as ‘smooth blasting’.

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Blasting and Explosives Quick Reference Guide 2010 - Dyno Nobel

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used in presplit and smooth blasting Hole diameter PF (kg/m3) Hard 0.6 -0.9 Medium 0.4 - 0.5 Soft 0.2 - 0.3. Calculating burdens

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Underground Excavation And Support - Search OnePetro

The specialized techniques known as smooth wall blasting and presplit blasting have now developed from the status of curiosities of rock excavation to the point ...

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date with what’s happening in and around the projects. October ...

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Left: Presplit blasting produces a smooth, stable final pit wall. Right: Presplit blast holes. Far Right: Stemmed production blast hole. Area presplit and excavated

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Context Sensitive Rock Slope Design Solutions

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Smooth Blasting ... Figure 12. Photo. Example of a presplit slope in massive sandstone. Note the abundant drill hole traces (half casts). ...

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Blasting and Explosives Quick Reference Guide - Dyno Nobel

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Presplit blasting Spacing = Hole diameter x 12 Burden = 0.5 x production blast burden (B) ... Smooth Blasting Spacing = 15 x Hole diameter (hard rock)

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Xiluodu Hydropower Station | Bank Thesis

The paper describes successful application of presplit blasting, bench blasting and smooth blasting in excavation of middle and lower parts of diversion tunnel in ...

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mining - Cebu House Design Philippines building a house.

face created by presplit blasting a jointed gneiss. It be evident that,

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