危岩体细观损伤断裂力学研究

Study of Fracture Mechanics of Microscopic Damage of Unstable Rock Mass

细观损伤力学常采用一种平均化的方法,把细观结构损伤机制研究的结果反映到材料的宏观力学行为的描述中去。这就涉及两个主要方面的内容,一是细观损伤的形式特点、描述以及变量选取;另一个就是平均化后向连续介质损伤力学的过渡问题。从上述两方面做了研究,指出了危岩裂端的损伤形式,对于危岩稳定性而言,损伤的发展和稳定性的劣化是一个动态的过程,起控制性作用的是主控裂端区域的损伤发展,定义了主控裂端损伤区,并给出了求解其大小和方位的方法。

Microscopic damage often uses an average method to describe the study results of microscopic structural damage mechanism in macroscopic mechanics of material. This involves two main aspects, one is the characteristics of microscopic damage, description and selection of variables; the other is transition of continuum damage mechanics after the average. Study has been done for the two aspects. Damage form of crack-tip is pointed out. For stability of the rock, the development of damage and the degradation of the stability is a dynamic process. Damage development of the master control crack-tip region plays the role of control. The damage zone of the master control crack-tip is defined and the methods to determine its size and position are given.