subgrade


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Related to subgrade: subgrade modulus

sub·grade

 (sŭb′grād′)
n.
The level layer of rock or earth upon which the foundation of a road or railway is laid.

subgrade

(ˈsʌbˌɡreɪd)
n
(Civil Engineering) the ground beneath a roadway or pavement
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References in periodicals archive ?
The project having total length of 118km, out of which 39km is a six-lane expressway with subgrade width of 24.7m, while the rest is 79km is Class-II highway with subgrade width of 12.3m.
The vertical displacement and settlement of the rail, the sleepers and the subgrade at various sections and depths were recorded.
High subgrade more than 4 m is commonly adopted in China [1], usually leading to big subgrade settlement.
Roadways and railways commonly consist of upper pavement or ballast layers (track slab) over one or more silty clay layers which are together compacted over a suitable soil subgrade. As it is well known, compacted clay material provides the most important structural element in the road system because, in most cases, the cumulative deformation phenomenon takes place mainly in the subgrade layer causing progressive fatigue cracking of upper road layers [1-3].
Abstract: This paper describes the behavior of reinforced embankments constructed on soft clay subgrade with varying compressible depths, embankment slopes and embankment heights.
Most of the rutting from the accelerated loading occurred in the soil subgrade as was expected.
Stone filled subgrade is mostly confined to high quality stone.
At the stage of development of transport infrastructure under conditions of high-speed train and heavy train traffic it is necessary to have an accurate idea about the technical condition of all components of the track, starting from the ballast and ending with the subgrade. During the implementation of the program Innotrack in five countries of the European Union 15 railway sections were measured, the purpose of these measurements was to assess the state of the track [1, 2].
A new 18-inch-thick rock subgrade will be placed, topped with 12 inches of gravel and capped with a layer of asphalt, Little said.
It is known that a laboratory resilient modus test and a falling weight deflectometer (FWD) test are usually used to obtain the resilient modulus of subgrade [5, 6].
The bearing strength of the pavement is reported by indicating PCN, pavement type, subgrade category, allowable tyre pressure, and method of the evaluation.
Geogrid is known as a reinforcement material that has been used to increase stability and improve performance of soft and weak subgrade in roadways.