What are the requirements for earthwork cutting excavation of railway subgrade?

During excavation, check the width and slope frequently, correct the deviation in time, avoid over-excavation, and keep the slope smooth.

Excavators and bulldozers are used to excavate the collapsible loess cutting along the slope from top to bottom (according to the designed slope rate), and excavators are used to transport the earthwork with dump trucks, and the slope is manually brushed and trimmed, so as to complete the waterproof and drainage facilities in time.

Cutting excavation should ensure smooth drainage system.

Excavation shall be carried out in layers from top to bottom, and the longitudinal slope shall not be less than 4%. Undercut excavation is strictly prohibited.

Expansive soil and loess cutting should avoid construction in rainy season, and subgrade replacement and slope protection and sealing should be closely related to excavation. When the excavation cannot be followed closely, a protective layer with a thickness of not less than 50cm should be reserved.

Cutting slope with retaining structure should be excavated and constructed in sections. The design requires that the cutting slope with layered excavation and layered protection should be excavated in layers from top to bottom, and the enclosure construction should be closely connected with excavation. If it cannot be completed immediately, a protective layer with a thickness of not less than 50cm shall be reserved.

Strictly control each layer of slope to be formed at one time, and the slope brushing work follows the excavation, forming an assembly line operation of slope brushing while excavating in multiple working faces. After each excavation, slope protection should be done in time. The excavated spoil is transported to the spoil ground for stacking. Planting soil and topsoil for other purposes are stored in designated places for restoring or planting vegetation.

Earthworks close to the cutting should be excavated gradually from one end of the cutting or according to the full width of the cross section.

For concentrated earthwork with a long distance, the longitudinal excavation method is adopted, that is, the height is divided into different grades along the longitudinal direction of excavation and excavated in turn. After the excavation reaches the design elevation, it shall be over-excavated by 30cm, and then the construction shall be carried out according to the filled subgrade to ensure the smoothness and compactness of the subgrade.

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