南水北调中线沙河渡槽开挖土石比计算方法探讨

Calculation method of soil-stone ratio for Shahe Aqueduct of MRP of South-to-North Water Diversion Project

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AUTOCAD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 calculation 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 terrain lines and multi- sectional geological boundaries is formed. The result shows that the diagram drawing can realize the separate quantity calculation for multi- stratified geological structures and intuitive description of the quantities for earth- rock excavation.