Unmanned underground mine inspection

[Mr Mike]

Article about robot mine inspection:

https://www.dpaonthenet.net/article/188997/Robots-achieve-historic-unmanned-underground-mine-inspection.aspx

 

[Cantclimbtom]

wwoooahhh!

"...I started an evacuation. At 6:40 everyone was accounted for    and at about 6:49 and 58 seconds the mine collapsed.."

 

[royfellows]

Shades of Middleton. (Derbys) ?

 

[Mr Mike]

Shades of Middleton. (Derbys) ?

I know its a different type of mine, but Greenside as well - the Big Crush.

 

[shotlighter]

Article about robot mine inspection:

https://www.dpaonthenet.net/article/188997/Robots-achieve-historic-unmanned-underground-mine-inspection.aspx

I wonder which pod Virgil deployed those robots from?

 

[tomferry]

After watching this I didn?t hear a reason for the collapse ? I flicked back in the video saw the photo of the survey with areas of pillar robbing , a random guess where these propped up with cogs and it?s flattened everything ?

 

[Cantclimbtom]

Well he did say that he heard a noise like rain around the pillars on one section so the pillars were failing rather than props failing. So not enough pillar. Although you could argue that's again symptoms not cause as that doesn't tell us if it's miscalculation, robbing or what... The fact that one section caused a domino effect to surrounding stalls makes me think that they didn't have enough harrier pillars either. But it's easy for me to be an armchair critic after the event, it probably all looked good a week/month before

 

[rjw]

After watching this I didn?t hear a reason for the collapse ? I flicked back in the video saw the photo of the survey with areas of pillar robbing , a random guess where these propped up with cogs and it?s flattened everything ?

In the article it says:

"It was determined that this collapse was caused by the failure of very old pillars (40 to 70 years old)"

I suppose "very old" is a relative term. I think he did well to take such decisive action given that it was something he'd never heard before. I've heard that rain like sound twice, on both occasions when digging through old fill. The second time I should have recalled that it was the precursor to a slump, but I genuinely thought it was rain, or that someone on the surface, in true mine explorer spirit, was sprinkling dirt on us  :. No time to think anything after that as it whooshed down.

 

[tomferry]

I have read about pillar failures in Leicestershire colliery books it sounds very very scary ,  the pressures involved are huge  and the maths to calculate it mind blowing . He made a very good decision.