为能够直观、准确地计算出复杂地形、地质条件下土石方开挖工程量，基于CASS7.0断面法，利用AU-TOCAD三维多段线、面域计算土石方工程量，并且结合南水北调中线工程沙河渡槽鲁山坡落地槽工程数据，提出了一种新的计算方法。该方法首先根据野外采集的原始地形点数据绘制出原始断面图，而后在DTM的基础上生成开挖后的数字地形图，并在数字地形图上标注出各类地质界线及界线点，再将各类地质界线及界线点插入到原始地形断面图中，最终形成包含原始地面线，设计地形线及多层地质界线的断面图。利用该图即可实现对多层地质结构的分别计量，从而能更加直观地描述各种土石在开挖中的工程量。%According to CASS7. 0 cross-section method, the quantities for earth rock excavation under complicated geological conditions are calculated perceptually and accurately by using 3D polylines and surface domain of AutoCAD. Thus, a new calcu-lation method is proposed by the engineering data of the section in Shahe Aqueduct of MRP of South-to-North Water Diversion Project. Firstly, the original cross-sectional diagram is obtained from the field terrain data, and then the post-excavated digital topographic map is generated on the basis of DTM. Various geological boundaries and points of boundaries are marked on the map and illustrated in the original cross-sectional diagram. The final diagram containing the original ground lines and designed ter-rain lines and multi-sectional geological boundaries is formed. The result shows that the diagram drawing can realize the sepa-rate quantity calculation for multi-stratified geological structures and intuitive description of the quantities for earth-rock exca-vation.
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