| 单词 | pressure arch |
| 释义 | > as lemmaspressure arch pressure arch n. Mining a distribution of pressure over an excavation resembling that in a structural arch, caused by increased pressure on the side walls of the excavation, which act as abutments supporting the strata forming the roof. ΘΚΠ society > occupation and work > workplace > places where raw materials are extracted > mine > [noun] > pressure on side walls as support to roof pressure arch1950 1950 Ferrari & Wardell in E. Mason Pract. Coal Mining I. ix. 145/2 Props and bars, chocks and cutter nogs, all of which can be withdrawn and reset, are used for carrying the weight of stone inside the pressure arch. 1997 R. D. Singh Princ. & Pract. Mod. Coal Mining xii. 392 It was possible to indicate conservative estimates of the width of maximum pressure arch for various depths. < as lemmas |
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