WebBurden. The distance between rows of blastholes parallel to the major free face or the amount of rock directly in front of a blasthole at the time of initiation. ... Spacing. The … WebThe Burden Suggested in Konya Formula is defined as the distance from the blast hole to the nearest perpendicular free face and is represented as B = (3.15*De)* (SGe/SGr)^ (1/3) or Burden = (3.15*Diameter of explosive)* (Specific gravity of the explosive/Specific gravity of the rock)^ (1/3). Diameter of explosive is any straight line segment ...
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WebMar 30, 2015 · Accordingly, a spacing to burden ratio and matching burden can be selected to produce the optimal blast pattern (typically in the 1.5 -2 range, See Mohd and Singh (2015) on the selection of ... WebAug 1, 2024 · Controllable parameters are the burden, spacing, height of the bench, stemming length, blast hole ... hole diameter to burden ratio, powder factor, maximum charge per delay, RQD, blastability ...
WebApr 1, 2016 · In general, the spacing to burden ratio varies between 1 and 2 but the optimal spacing to burden ratio was 1.15 for staggered pattern and 1.25 for rectangular … WebMay 1, 2024 · 1. Introduction. At present, drilling equipment with 200-mm hole diameter and above is widely used in large open-pit mine. The blasthole diameter has significant effect on rock fragmentation, since it is the primary blast design parameter and has influence on the choice of burden, spacing, stemming length, etc. [1], [2], [3].In order to choose the …
WebOct 5, 2024 · Labor burden rate (for graphic designers): $15,000 / $60,000 = $0.25. Labor burden rate (for copywriters): $17,000 / $64,000 = $0.27. This means for every dollar … WebJun 8, 2013 · Burden, spacing, stemming, powder factor, and stiffness ratio have been considered in order to develop the backbreak predictive equation. Although the delay time is an important effective parameter on backbreak, it was not considered because, in this case study, it takes a fixed value.
WebMay 31, 2015 · Burden. Burden is a very important and critical dimension when designing a blast. A burden is the distance from the face to the blast hole at the time the hole is fired. …
WebFeb 5, 2024 · The burden rate is the dollar amount of burden (i.e., overhead) that is applied to one dollar of wages. For example, if the annual benefits and payroll taxes associated … statlers without lew dewittWebJul 13, 2024 · The term “stiffness ratio” was first used in 1969 by Calvin Konya in his fundamental work on blasthole spacing. Konya discovered there was a relationship … statley homes in badenochWebVoid ratio required for rock swell = 30 - 50%: Max distance from blast hole to void hole in cut = 2.5 x Void hole diameter (≤ 0.5 m) ... Reduce drill burden/spacing's from outer … statline a division of mtfWebThe equations for determining the burden, spacing, and stemming require that we know the blast hole diameter. So, looking at the diameter of the hole is a good first step. ... And so, using “real-world" data for powder factor … statline cbs.nlWebApr 17, 2024 · The stiffness ratio is a function of the burden, which will determine the classification of the bench as either a low or high bench. The spacing is then directly scaled off of the burden based on this bench classification. The hole-to-hole timing of the blast is scaled off of the spacing, which means it is indirectly scaled from the burden. statline cbs inflatieWebJul 22, 2024 · Monjezi et al. after conducting a series of analyses, mentioned that several parameters such as burden-to-spacing ratio and number of blasting rows are the most effective parameters on rock fragmentation. Ebrahimi et al. suggested a new model based on artificial bee colony (ABC) and ... statline clockingWebJan 20, 2024 · The variables used for the study was such as burden to spacing ratio, stemming to hole-depth ratio, p-wave velocity and the density of explosive. For the … statline projections