| 单词 | room and pillar |
| 释义 | > as lemmasroom and pillar room and pillar n. Coal Mining attributive designating a method of mining that involves creating rooms (sense A. 7b) separated by pillars, which are removed at a later stage. ΚΠ 1820 Edinb. Encycl. (1830) XIV. 374/1 In the mining practice of Great Britain, there are four different systems of working coal mines, viz. 1st, Working with pillars and rooms termed post and stall.] 1848 H. T. De La Beche & L. Playfair Second Rep. Coals Suited to Steam Navy App. 12 All these seams have an inclination of 1 in 12 towards the south-east, and are worked by the room and pillar method. 1902 Jrnl. Geol. 7 626 The rock gypsum is won by underground mining on a room and pillar system. 2002 New Yorker 18 Nov. 59/2 This elementary method of mining, called room-and-pillar mining is an engineering exercise designed to leave enough coal still standing..in order to keep the mine from collapsing. < as lemmas |
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