Highway fill section is composed of subgrade and pavement, both of which are important parts of highway engineering. However, the structure of pavement and subgrade is different. Let's take a closer look.

Face protection structure

Pavement structure includes surface layer, base layer, subbase layer and cushion layer. These parts have their own functions and are isomorphic with the pavement.

Subgrade structure

Subgrade structure includes subgrade and embankment. Subgrade is divided into upper and lower subgrade, and embankment is divided into upper and lower embankment. These parts are isomorphic to form the subgrade of expressway.

The difference between pavement and subgrade

The structure of pavement and subgrade is different. Pavement is the surface layer in highway engineering, while subgrade is the part below the pavement. Pavement and subgrade have different functions, but they are interrelated.

The difference between the upper berth and the lower berth.

Road bed is a part of subgrade, which is divided into upper road bed and lower road bed. The upper layer is the area with a depth of 0-30cm below the bottom surface of the road, and the lower layer is the area with a depth of 30-80cm below the bottom surface of the road.