针对计算对象为复杂地层和有大型地下洞室群时， 自动形成三维有限元计算网格较为困难的情况，提出了三维网格自动剖分的"断面节点 控制法"。该法以地质勘探剖面图作为主控制断面，并在主控制断面上完成少量的前期数据 准备，通过不同的合并、连接和插值，在全计算域上一次形成计算空间网格。多个工程计算 实例表明，该法运用简单、适应性强、效率较高。

In the paper,the method of sectionnode control is first proposed to solve the problem of 3D mesh autogeneration in FEM analysi s when geological strata are complicate and largescale underground grottos are excavated.The geological exploratory sections are used as chief control section s,in which a small amount of data preparation is needed.The 3D mesh is generat ed in the whole calculating region by means of different mergences,linkages and interpolations.Several engineering calculation illustrations show that this meth od is simple,more applicable and efficient. 