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Swallowed up by the ground... Sinkholes!
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rynner2Offline
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PostPosted: 19-02-2014 16:05    Post subject: Reply with quote

"It is directly above a mine shaft.."

I'd be inclined to put this in 'Underground'. My working definition for a sinkhole is that it is mainly caused by water eroding and dissolving soft rocks, usually sedimentary.

Mine shafts are man-made, although the final collapse of one might be triggered by the weight of wet ground bearing down on it. And mines are often dug in hard rock, often of igneous origin, which doesn't erode or dissolve so easily.

But some cases are not so easy to identify. Mines have been dug in sedimentary rock, for chalk or flint (or even coal!), so finally an expert will have to opine whether a hole is a sinkhole or a collapsed mine-working.
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SameOldVardoger
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PostPosted: 19-02-2014 23:00    Post subject: Reply with quote

rynner2 wrote:
"It is directly above a mine shaft.."

I'd be inclined to put this in 'Underground'. My working definition for a sinkhole is that it is mainly caused by water eroding and dissolving soft rocks, usually sedimentary.

Mine shafts are man-made, although the final collapse of one might be triggered by the weight of wet ground bearing down on it. And mines are often dug in hard rock, often of igneous origin, which doesn't erode or dissolve so easily.

But some cases are not so easy to identify. Mines have been dug in sedimentary rock, for chalk or flint (or even coal!), so finally an expert will have to opine whether a hole is a sinkhole or a collapsed mine-working.


The Bayou Corne sinkhole is above a salt mine. They have been waiting one and a half year for it to collapse completely. Still it only devours some trees once in a while.
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Pietro_Mercurios
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PostPosted: 20-02-2014 08:34    Post subject: Reply with quote

Sinkholes are deep holes that suddenly open up on the surface. I don't think that what's underneath the hole, making it happen, actually matters so much. Smile
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rynner2Offline
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PostPosted: 20-02-2014 12:54    Post subject: Reply with quote

Pietro_Mercurios wrote:
Sinkholes are deep holes that suddenly open up on the surface. I don't think that what's underneath the hole, making it happen, actually matters so much. Smile

One is essentially man made, while the other is produced by nature.

The distinction is important if rescue or repair work is needed, because the workers need to know exactly what they are dealing with. In particular, how dangerous the hole still is. Shoring up a mine in hard rock is simpler and safer than trying the same thing in soft rock country.
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Pietro_Mercurios
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PostPosted: 20-02-2014 14:15    Post subject: Reply with quote

rynner2 wrote:
Pietro_Mercurios wrote:
Sinkholes are deep holes that suddenly open up on the surface. I don't think that what's underneath the hole, making it happen, actually matters so much. Smile

One is essentially man made, while the other is produced by nature.

The distinction is important if rescue or repair work is needed, because the workers need to know exactly what they are dealing with. In particular, how dangerous the hole still is. Shoring up a mine in hard rock is simpler and safer than trying the same thing in soft rock country.

Well, yes. But the business end on the surface would still be a, sinkhole. Smile
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rynner2Offline
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PostPosted: 20-02-2014 15:06    Post subject: Reply with quote

The business end of a sinkhole is underground, sometimes deep underground. The processes of erosion and and dissolving carries on as long as there is slightly acidic water available, so sinkholes continue to grow, getting deeper and more extensive.

The hole at the surface is a secondary effect, created when the ground falls into the void below. Wink
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Pietro_Mercurios
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PostPosted: 20-02-2014 15:23    Post subject: Reply with quote

That's just the cause of the sinkhole. Laughing
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ramonmercadoOffline
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PostPosted: 20-02-2014 21:47    Post subject: Reply with quote

Stop digging Ryn.
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krakentenOffline
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PostPosted: 21-02-2014 19:24    Post subject: Reply with quote

A hole is a hole,is a hole.

That's the whole of the matter, the whole truth,the whole thing in a nutshell. Truth shall make us whole.

There's a whole lot of shaking going on! A whole lot of sinking, too!

BASTA!
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rynner2Offline
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PostPosted: 09-04-2014 08:00    Post subject: Reply with quote

This one's in a class of its own...

Crawley leaking sewer pipe forces A23 closure

Part of a major road in West Sussex will be shut for the rest of the week after a hole was caused by a leaking sewer pipe.
The hole appeared on a section of the A23 north of the[?] Crawley on Sunday.

The road has been shut northbound between the Fleming Way and Lowfield Heath roundabouts for repairs.
Thames Water said it was working with West Sussex County Council and the emergency services to put diversions in place.
"The closure is expected to last beyond this week while investigations continue," the spokesman said.
"We are sorry for any inconvenience this may cause and will open the road as soon as it is safe to do so."

http://www.bbc.co.uk/news/uk-england-sussex-26937118

...it's a Stinkhole! Cool
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