DRILLING ,BLASTING AND FRAGMENTATION OF ROCKS

Jun 28th, 2015
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1:Factors affecting drill pattern - 1. geology 2. area - shape 3. free faces - location and nos

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DRILLING ,BLASTING AND FRAGMENTATION OF ROCKS1:Factors affecting drill pattern basic drill patterns i:geology 1: square ii: area shape 2: rectangular iii:free faces-location and nos 3:staggered iv:boreholes-dimensions 4:echelon pattern v :explosives-types and characteristics 5:V-pattern vi :fragmentation-planned 6 :staggered v vii :site specific condition viii :local blasting experience2:blast design factorsI:rock characteristicsii :explosive characteristicsiii :blast geometryiv :site specific conditionv :safety and environmental concernsvi :production concernsvii :drilling and blasting costviii :geology3: basic blast design parameters* burden :distance between blasthole and free face*Spacing :distance between any two consecutive boreholesSub-drilling: Stemming:Hole diameterDelay patternRock face profiling system1: fishing rod method2:survey method (laser profiling methods) i:2D approach to burden measurementii :3D modelling a :digital photogrammetry b :laser scanningAPPLICATIONS OF LASER PROFILING SYSTEM1: Profiling quarry faces and determining precise burdens against hole depth.2: standardising offset for the front row of holes.3: helping in optimum deployment of drilling machines.4: measur

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