Tunneling in horizontal and folded rocks.

1.	Tunneling in horizontal and folded rocks.
Answer» A tunnel is a long, narrow, essentially linear excavated underground opening, the length of which greatly EXCEEDS its width or HEIGHT. (Walhstrom, 1973). In CONTRAST, a cavern is an underground opening whoselength and width are roughly similar. These two types of EXCAVATIONS are end-members, and every underground excavation undertaken by mankind can be looked UPON as a combination of the two. A shaft can simply be thought of as a tunnel which is vertical rather than horizontal.

Answer»

A tunnel is a long, narrow, essentially linear excavated underground opening, the length of which greatly EXCEEDS its width or HEIGHT. (Walhstrom, 1973). In CONTRAST, a cavern is an underground opening whoselength and width are roughly similar. These two types of EXCAVATIONS are end-members, and every underground excavation undertaken by mankind can be looked UPON as a combination of the two. A shaft can simply be thought of as a tunnel which is vertical rather than horizontal.

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Tunneling in horizontal and folded rocks.

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