zemin altı, toprak altı

listen to the pronunciation of zemin altı, toprak altı
التركية - الإنجليزية
(Mukavele) subgrade
The layer of native soil on which the foundation of a road is laid
Road surface shaped and graded before application of rock
The soil prepared to support a pavement structure or a pavement system It is the foundation of the pavement structure
The portion of a roadbed surface that has been prepared as specified, upon which a subbase, base, base course, or pavement is to be constructed