Harry Harrison at one time lets one of his protagonists - professor Coypu - refer to mankind's legendary home as 'Dirt or Earth or something like that' (The Stainless Steel Rat saves The World). 'Blown up in an atomic war ages ago'.Maybe it's a translation from German language ?
Here "Erde" (earth) means our planet, as well as that usually dark, dirty and
somehow crumbly substance, you call "soil"
That's my understanding of 'earth' but I'm struggling to find somewhere with 160ft of soil. The Loess in China? The podzols and chernozems of Ukraine? Sand dunes? There's not many places with soil that deep.as well as that usually dark, dirty and
somehow crumbly substance, you call "soil"
In this case it's, "hard dirt in the desert". IIRC it dug itself so deep they didn't bother digging it up.I've been looking at Paveway recently and (OK, OK, yes, yes, it's Wiki) on the Wiki page for the GBU-28 it says:
'It proved capable of penetrating over 50 metres (164ft) of earth or 5 metres (16ft) of solid concrete'
Donning my Geologist's (hard) hat - what is 'earth'?
Chris
Well, the video was posted back in 2016. Not sure what you expect us to do about it?The video is private.
Not sure what you expect us to do about it?
Sometimes it's just gone. I posted a link to a video that had several good shots of Nike Zeus A launches in 2017. Noticed a while back that that channel was deleted. Odds are I've got the video downloaded. . .somewhere. Haven't been able to find it though.What was its' title and what was it about? If I know the title I can then do a search on YouTube.
Most of the US Midwest has soil that deep. So does eastern Washington and northern Idaho (Camas and Palouse prairies).That's my understanding of 'earth' but I'm struggling to find somewhere with 160ft of soil. The Loess in China? The podzols and chernozems of Ukraine? Sand dunes? There's not many places with soil that deep.
I thought concrete went way higher than 20ksi. I recall them testing super hard missile silos at 50ksi.Granite yield strength is on the order of 20k psi, which is similar to some high-strength concretes used in bunkers. So, penetration in granite is usually estimated as being similar.
As Air Force Brigadier General Scott Vander Hamm explained to Air Force Magazine, the MOP “is specifically designed to go after very dense targets-solid granite, 20,000 (pounds per square inch) concrete, and those hard and deeply buried complexes-where enemies are putting things that the President of the United States wants to hold at risk.”
At risk of going OT (though not too much as we're talking about bunker busting):Concrete yields are extremely variable. Those 50kpsi and up versions are very exotic, with things like steel fibers in the mix. I think 20k is about the baseline for "typical" hardened military facilities.
See, for example:
Iran nuclear sites may be beyond reach of "bunker busters"
With its nuclear program beset as never before by sanctions, sabotage and assassination, Iran must now make a new addition to its list of concerns: One of the biggest conventional bombs ever built.www.reuters.com