土方量的计算（Calculation of earthwork）.docVIP

土方量的计算（Calculation of earthwork） Earthwork calculation 8.2.1 DTM method of earthwork calculation By the DTM model to calculate the earthwork volume is measured according to the coordinates of ground points (X, Y, Z) and the design elevation, by generating triangulation to calculate the amount of earthwork every three pyramid, finally accumulated earthwork specified within the scope of cut and fill, and draw the demarcation line of earthwork. Three methods DTM method is a kind of earthwork calculation, is calculated by the coordinate data file, one is calculated in accordance with the elevation point on the map, the third is calculated in accordance with the triangulation on the map. The process of re establishing the triangulation algorithm contains two, third methods of directly using the existing map triangle, triangle mesh reconstruction no longer. The operation process of the following three methods: 1. according to the coordinate calculation L draw the line to calculate earthwork composite area must be closed, but dont try to fit. Because the line iterative fitting curve in earthwork calculation, influence the accuracy of calculation result. L with a click of the mouse from engineering application of \DTM method in earthwork calculation according to the coordinate file \. L tip: choose a click of the mouse from the painting line closed line figure 8-3 pop-up composite Earthwork Calculation Parameters dialog box. Figure 8-3 earthwork calculation parameters Area: the value of composite wire enclosed polygon level projection area. Flat field elevation: refers to the target to achieve the design elevation. Boundary sampling interval: boundary interpolation interval set, the default value is 20 meters. The slope slope treatment setting: select check box, then set the slope function is optional, selected slope way (up or down: a flat field elevation relative to the actual ground elevation height, flat field elevation above the ground elevation is downward sloping). T