…These are examples of tunnel supports at the face or tunnel (advance), but in the past, square frames made of tunnel timber or brick-lined structures were used for vertical shafts, but now concrete-lined structures are the norm. Mine supports are installed to resist earth pressure, and functionally they can be divided into rigid supports, compressible supports, and flexible supports. Rigid supports resist earth pressure until they can withstand it, and will break if the earth pressure exceeds the strength of the supports. … *Some of the terminology that refers to "flexible supports" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…これらは切羽または坑道(横坑)における坑内支柱の例であるが,立坑では,昔は坑木による四角な枠や,煉瓦を積み上げる煉瓦巻も用いられたが,現在はコンクリート巻が普通である。坑内支柱は地圧に対抗するために設けられるものであるが,機能的にみると剛性支柱と可縮性支柱,可屈性支柱に分けられる。剛性支柱は地圧に対抗しきれるまで対抗するもので,地圧が支柱の強さより大きくなると破砕される。… ※「可屈性支柱」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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