Where can I find chalk rock and boulder clay?

Rock-hard clay for tunnel shoring?

If i am digging a tunnel (hypothetical question) would rock-hard clay be able to support the tunnel without using wooden support? (rock-hard clay is compressed clay that is hard to ...show more
Answer:

It might be rock hard now but as soon as it rains the clay will be soggy soft and will collapse without warning. You must shore and line the tunnel as soft clay can creep through the smallest space and fill the tunnel with ooze. Don't kid yourself it will always stay dry unless you live in the Nevada desert or your tunnel is at least ten metres below ground. Many an over optimistic tunneller lies buried beneath apparently solid clay - it is very treacherous stuff.

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no will cave in

Alina

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