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The ground is great because it’s there. Of all the fears and uncertainties life throws at us, one thing we can always count on is the ground being exactly where it was yesterday. So when you peek out your front window one morning and see a yawning pit where you used to have a lawn—or neighbors—it can be a bit unsettling. Well, welcome to the lives of these people.
originally posted by: olbe66
a reply to: Tjoran
In the state of Pennsylvania in the USA there were many coal mines dug over the past 175 years, and no one really knows where all of them are. When you buy a house in the state your are offered a subsidized insurance policy incase it is located over an old mine, and it collapse.
originally posted by: TrueBrit
a reply to: hknudzkknexnt
It does however sound like a perfect moment to access those voids under the earth, map them, establish their true volume, and then fill that volume with rapid setting cement, or ferrocrete perhaps. That would prevent further collapse, and provide a stabilising effect on the surface area affected by any subsidence issues being caused at ground level.