Strayos’ Post

Name: Protecting the highwall 3: Line Drilling
Uploaded: 2024-03-12T21:12:44.713Z
Channel: Strayos
Description: Leaving behind a clean safe highwall is critical for future drilling and blasting safety, site safety and site optimization. Nathan Rouse, PE, PhD of Thoroughbred Drill and Blast Consultants discusses the ways to use blasting to get your best highwall. Here is the third way to leave behind an optimized highwall. #mining #blasting #quarrying #smartmining #sitesafety

Strayos

7,552 followers

7mo

Leaving behind a clean safe highwall is critical for future drilling and blasting safety, site safety and site optimization. Nathan Rouse, PE, PhD of Thoroughbred Drill and Blast Consultants discusses the ways to use blasting to get your best highwall. Here is the third way to leave behind an optimized highwall. #mining #blasting #quarrying #smartmining #sitesafety

Transcript

So the first ones line drilling and in this method holds their spaced close together and they're not loaded. So they're they're placed in a line to create a final perimeter. And the idea is that the holes are close enough together that they stop any of the fractures from the production holes from going beyond. I've seen this used a lot in the field. Um, to to. Sometimes it works, sometimes it doesn't, and most of the time it doesn't work is because the holes aren't spaced close enough together, so they have to be really closely spaced to prevent the fractures from going much beyond them. Um, the approach here. A good rule of thumb is to drill them at a spacing of two to four times the drill hole diameter. So let's say you're on a construction project and you're drilling 3 inch or 75 millimeter holes. Then those holes need to be like 6 to 12 inches apart and 12 inches, probably pushing it for good results. This does require a a significant amount of drilling effort because of the amount of holes, so it can be pretty costly from a drilling perspective and the drilling needs to be really accurate because you're not using explosives to aid in the creation of a protective line like you would with a pre split. Uh, so again, significant drilling, accurate drilling. So it's pretty high cost option that you can follow for for line drilling and here's just a couple of pictures of of what that might look like. Like I said, it's expensive, requires accurately accurate drilling. In this case or in these two images the the holes are drilled really close together, so you can imagine how much that would cost. And then here's just a diagram of the line drilling. So I've I've just it's a general diagram right. So we've we've got our line drilled holes there are two to four times hole diameter in white at the top there and then our loaded blast holes you can tell see how those would be arranged along the line. So you want them to be greater than or equal to half of the spacing. Um. Which is shown there at the bottom. So again, this is the rule of thumb. It's a good place to start. Is this gonna work in every geology or every scenario? Not necessarily. But it's a good place to start. Where I've seen it work really well is in construction, where they have to get good results, and so they make sure to put the extra effort into the line drawing.

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Strayos’ Post

Protecting the highwall 3: Line Drilling

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