In areas with complex terrain and large fluctuation, or areas with long and narrow land, deep excavation and irregular filling depth, the cross-section method should be selected for earthwork calculation.
The accuracy of earthwork quantity is related to the length of spacing L, and the smaller the L, the higher the accuracy. However, this method requires a large amount of calculation, especially in the case of large measuring range and high accuracy. If the interval between sections is increased to reduce the amount of calculation, the accuracy of the calculation results will be reduced; Therefore, there is a contradiction between calculation accuracy and calculation speed in the section method.
2. Network law
Grid method is suitable for large-area earthwork estimation and some sites with small terrain fluctuation and gentle slope change. In this method, the site is divided into several square grids, and then the volume of each quadrangular prism is calculated, so that the total earthwork is obtained by adding the volumes of all quadrangular prisms.
Extended data:
Calculation should meet the conditions.
Earthwork calculation must have, without these two conditions, there is no basis for earthwork calculation. Therefore, the original terrain must be surveyed before earthwork construction, and the scale of surveying and mapping must be determined according to the accuracy of earthwork calculation and terrain conditions. The mapping scale is between 1: 500 and 1: 2000. Especially in the design change, the original terrain elevation, the original design elevation and the changed design elevation must be marked.