Abstract: The general jointed element that consists of several pairs of double-node can be only used to the middle parts of faults. This paper presents a special jointed element for the tip of faults and describes a new type of solid element, which is near to the tip of a fault, and is called the special solid element. These two new types of element plus the general jointed element could simulate any fault, which is of any azimuth and limited of strike length. Thus, this model provides a supplement to geomechanic problem and a powerful tool to simulate and investigate the effect of faults on geological structure.

Key words: Fracture zone, Finite element, Jointed element

摘要： 一般节理单元的节点都为双节点,仅适用于断裂的中间部分,要将它运用于断裂端部须作特殊处理,因而提出断裂端部特殊节理单元;并引入断裂端部特殊实体单元。有了这两种单元,再加上一般节理单元,就可以模拟任意走向有限长度的断裂面或带,从而对此类地质力学问题的完备性做出补充,有助于研究断裂在地质构造活动中的作用。

关键词: 断裂带, 有限元, 节理单元