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Get Price2015-9-17 · hole presents a hazard, the explosive may be removed by washing out with water or, if underwater, blown out with air. No drilling or digging shall be permitted until all missed holes have been addressed. When unexploded explosives are discovered mixed in with the shot rock, excavation will cease until a Project Blaster is notified and he is able to
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Get Price2016-1-13 · Rock drilling Penetration Rate (PR) is influenced by many parameters including rock properties, machine parameters of the chosen rig and the working process. Five datasets were utilized to quantitatively assess the effect of various rock properties on PR. The datasets consisted of two sets of diamond and percussive drilling and one set of rotary drilling data.
Get Price2014-4-2 · The rock is known as a high-calcium limestone if the magnesium carbonate content is small. The rock is called a magnesium or dolomitic limestone if 10 percent or more of magnesium carbonate is present. When the magnesium carbonate content approaches 45 percent, the rock is known
Get Price2014-3-1 · The drilling rates and their effects on 5 m vertically and horizontally oriented hole lengths of four different rock types were investigated. It was seen that, although physical and mechanical rock properties are more effective in vertical than horizontal drilling, vertical stress ( σ v ) and Poisson’s ratio are more effective in horizontal ...
Get Price2008-5-22 · borehole at a specified hole diameter. Expressed in pounds per foot, LD is computed as: LD (lbs/ft) = 0.3405 ρD2 where D is the borehole drilled diameter in inches and ρ is the explosive density in g/cm3. The LD value may also be computed by dividing the total explosives charge weight loaded into a hole (W) by the length of the
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Get Price2021-3-29 · Blasting Vibrations. Blasting is, by far, the most-studied source of ground vibration, as the potential for that vibration to damage structures was recognized far earlier than that of construction heavy equipment. There is a large scientific and technical literature of blasting vibration effects on homes and other structures worldwide. [1]
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