drilling and blasting equipment pdf
blast design formulas pdf
drilling and blasting notes
orica blasting handbook pdf
types of blasting patterns pdf
controlled blasting techniques pdf

diamonds disintegrating the rock whilerotating. Page 10. FUSION. PIERCING. ▫ Recent development in drilling holes for blastingpurpose. Rotary drilling is one of the most popular drilling techniques for large surface mines where large diameter holes are used in blasting. Figure 2-8 shows. When the drilling and blasting method is used, the ground is shattered by the detonation of explosives within holes drilled into the solid rock. These holes are Controlled blasting techniques: • Line drilling. • Presplitting. • Smooth blasting. • Cushion blasting. Measurements and calculations: • Loading density. Rock Blasting and Overbreak Control 9.1.3.7 BLASTING IN BEDDED ROCK . Control techniques such as presplitting, trim blasting and line drilling work while bench blasting is done towards two or more free surface. Various drilling patterns have been developed for blasting solid rock faces, such as:. A contractor plans to use dynamite that has specific gravity of 1.3 to open an excavation in granite rock. The drilling equipment available will drill a 3-in Where the fragmentation is unacceptable, the best solution is to use smaller blast holes with smaller blast pattern dimensions. This extra drilling and blasting. Designing Pattern; Drill & Blast Engineer. • Composites are reviewed to ensure that the desired blast location has not been previously blasted. This document details management of drilling, blasting and rock processing operations in order to create a rock platform for the modernization construction Where drilling and blasting conditions are both severe, the operator should use premium explosives, at least in the bottom one third of the drill hole. Clearing Where drilling and blasting conditions are both severe, the operator should use premium explosives, at least in the bottom one third of the drill hole. Clearing Line drilling A method of overbreak control which uses a series of closely spaced holes that are not charged. Loading density The weight of explosives per metre the rock to be blasted (hardness, microfissuration, natural fracturation, behavior during drilling, holes position and deviation, profiles),' the explosives andControlled Blasting - Techniques used to control overbreak and produce a competent final excavation wall. See line drilling, presplitting,