In the calculation of earthwork volume, we should not only calculate the natural excavation volume and the required natural fill volume, but also balance the earthwork volume and make up the fill with the excavated soil. ?

Due to the looseness of soil, the volume of naturally dense soil will expand after being dug out (called initial looseness). When this part of soil is compacted in the filling area, the compacted volume is also larger than the initial volume of natural dense soil (called final loosening). Therefore, excavation = fill does not mean earthwork balance. Consider the amount of waste soil transported abroad and the amount of buried soil transported inside (including the amount of earthwork excavated in the foundation trench of the building, etc.). ), the calculation of earthwork balance is more complicated.

Extended data:

Precautions:

Earthwork excavation shall be carried out from top to bottom according to the requirements of drawings, and indiscriminate excavation and overbreak shall be strictly controlled. Blasting construction and digging for soil are strictly prohibited.

When there is an aquifer in the excavated earthwork section, measures should be taken before the earthwork excavation of this layer.

Pay attention to drainage during earthwork excavation, especially in areas with high groundwater level. During excavation, the method of first two sides and then the middle should be adopted, and 3 ~ 4% cross slope should be left in the construction section to ensure smooth drainage.

If any change is found in the nature of soil layer during excavation, the construction scheme and excavation slope shall be revised and reported to the supervision engineer for approval in time. After the subgrade excavation reaches the elevation, it should be carefully trimmed to make its width, slope and side ditch meet the design requirements.

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