From the cataestrophic theory, applying related equations, this paper discusses on physical mechanism of unstable coal / rock pillar, and the conditions of the unstability are also given.

• 从突变理论出发,引用煤岩损伤本构方程,讨论了煤(岩)柱失稳的物理机制,并给出了煤(岩)柱失稳的条件。