路堑

在土木工程中，路堑是高于现路水平面的地表土石被挖走的工程。一般用于公路、铁路、运河，以截弯取直、降低纵坡。[1] [2]

1860年开通的穿过威尔士坎布里安山脉花岗岩的纽顿-马汉莱斯铁路的塔勒西格路堑，深36米，是当时世界上最深的路堑。
Open-cut station of the New York City Subway
路堑

挖掘路堑可以用人力锹挖、平地机、铲运机、挖掘机、钻爆法。[3]

路堑可分为山边绕过的与穿山而过的两种。[4]

著名路堑

参考文献
  1. Alexander Smith (1875) A new history of Aberdeenshire
  2. Robert G. Lewis et al., eds., Railway Age's Comprehensive Railroad Dictionary (Omaha, Neb.: Simmons-Boardman Books, 1984), p. 48. This reference does not include a definition for the corresponding term fill.
  3. Herbert L. Nichols, Jr., and David A. Day, P.E., Moving the Earth: The Workbook of Excavation, 5th ed. (New York: McGraw-Hill, 2005), pp. 8.16 et seq.
  4. Nichols and Day, Moving the Earth, p. 8.16.
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