WEBToday, it is possible to rapidly drill the required blast holes with good precision using modern drill jumbos. A wide variety of explosive products are available to charge the holes and with the use of electronic delays the holes can be properly sequenced.
7.3.2: Drift Round Blast Design | MNG 230: Introduction to …
WEB7.3.2: Drift Round Blast Design. For drift rounds, we are talking about driving openings, i.e., drilling, blasting, loading, and hauling, in an underground mine. These openings are horizontal or nearly so in many cases, but can be on fairly steep grades in others.
WEBvertical or angled holes will be used the drill the round. Conventional shafts and raises are drilled with vertical holes, with some angled holes in the cut if a pyramid or swing cut is used for opening the round. Small tunnel headings generally use …
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6.1. GENERAL
WEBTo successfully blast a full round, the cut must be drilled, charged and blasted correctly. Cut holes are drilled very near to each other, as parallel as possible, as shown in FIGURE 6.2.-3.
Drift Drilling and Blasting - Promine
WEBPromine’s new module “Drift Drilling and Blasting” is a versatile and easy-to-use module that allows you to design drilling cuts, drill-and-blast holes, set delays and generate detailed reports to obtain a well-designed horizontal development.
(PDF) Blasting Design for Tunnels - ResearchGate
WEBJan 1, 2000 · The blasting sequence in a tunnel or drift. ... To successfully bla st a full round, th e cut must. ... Drilling and blasting as a tunnel excavation method .
7.4.1: Patterns for Drift Rounds | MNG 230: Introduction to Mining ...
WEBThis diagram illustrates a typical drift round in medium-hard rock using four-hole vertical V cut with two-hole baby V cut and MS delay electric blasting caps. In this example of the V-cut, the baby V fires first, and creates a small free face for the firing of the two large Vs.
Empirical guidelines for drift blast design - ScienceDirect
WEBJul 1, 1990 · The extra time spent in planning and accurately drilling the cut would result in the full ad- vance of the face and "boot leg" free round. Proper spacing and alignment of the burn cut holes are necessary to successfully pull the desired depth.
Drilling and blasting as a tunnel excavation method
WEBJan 1, 2000 · According to the drilling and blasting excavation process of the tunnel, the disturbance effects induced by blast load and transient unloading of excavation load are analyzed; and based on...
Proposed blast design for the drift round (after Martin et al., 1989 ...
WEBAn automated drill and blast system was developed by Martin et al. (1989). Parameters of a typical blast design have been displayed in Figure 1. In this system the explosive was mixed from...