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subgrade

[suhb-greyd] /ˈsʌbˌgreɪd/
noun
1.
the prepared earth surface on which a pavement or the ballast of a railroad track is placed or upon which the foundation of a structure is built.
adjective
2.
beneath the finished ground level of a project.
Origin
1895-1900
1895-1900; sub- + grade
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for subgrade
  • subgrade soils are prepared and compacted before the placement of subbase and/or base layers.
  • The base and subgrade conditions also play a significant role in performance.
  • The subgrade shall be clean of loose or wet material prior to placing concrete.
  • Unsuitable subgrade soils shall be excavated to a depth sufficient to produce a stable bearing surface for pavement subgrade.
  • subgrade shall be compacted as specified for asphalt pavement subgrade.
  • The subgrade condition and geotechnical properties of the base course aggregate and subgrade soils were also evaluated.
British Dictionary definitions for subgrade

subgrade

/ˈsʌbˌɡreɪd/
noun
1.
the ground beneath a roadway or pavement
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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12
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