Subgrade is the foundation of pavement, which refers to the part of subgrade within 80cm below the bottom of pavement. ?
The subgrade is 1, and the subgrade is divided into upper and lower layers: the subgrade within the depth of 0 ~ 30cm below the road bottom is called subgrade; Subgrade within the depth of 30 ~ 80 cm below the bottom of pavement is called subgrade bed.
The subgrade will bear the large load stress transmitted by the pavement, and it is required to be uniform and dense to achieve the specified strength. ?
Subgrade Subgrade refers to the strip structure built as the foundation of pavement according to the route position and certain technical requirements. Subgrade is a linear structure made of earth or stone.
It bears its own geotechnical gravity, pavement gravity and traffic load transmitted by pavement, and is an important part of the whole highway structure. ?
In engineering, roads are structurally divided into subgrade and pavement.
First of all, I'll tell you about pavement, which includes surface layer, base layer and cushion layer. Buffer layers may not be available. The base layer is a common water-stable layer, and the surface layer is the driving layer. I won't go into details here, each layer is a big article.
In addition, subgrade and subgrade are often called soil foundation. Generally speaking, you have cleaned the topsoil, dug a ditch and prepared to lay concrete or asphalt pavement on it. The part of this trench starting from the low soil is called subgrade, and the part near the low soil of the trench is also called subgrade, which is a part of subgrade.
General definition: 0 ~ 80 cm below the bottom of pavement layer is the road bed.