三角网法计算土方量的“破网”问题研究

Study on the problem of "break net" in earthwork calculation by triangulation network

对三角网法计算土方量展开了深入研究,讨论了其优缺点,剖析了其计算过程中存在的问题。针对三角网投影时出现"破网"的问题,提出了创建一个虚拟的投影组合面,再对该投影组合面进行三角剖分,求出剖分之后的每个三角形对应的三棱柱的体积,进而求出总的土方量。最后,通过实例验证了该方法,并对三种方法精度进行了分析。

The paper thorough researched the method of earthwork calculation by triangulation network,discussed its merit and shortcoming,and analyzed the problem in calculation.Aimed at the triangulation network projection appear the problem of ＂break net＂,the paper established a virtual projection combination surfaces,then divided the projection combination surfaces,calculated the volume of the three prism which correspond to the each triangle,and calculated overall earthwork.Finally,the paper through a example validated the method,and analyzed the precision of three kinds of method.