Abstract: The formation and expanding of control fissure is the core of mechanism for perilous rock to develop.Based on the theory of damage mechanics,fracture mechanics and elastic mechanics,the formation and expanding of control fissure were researched under the condition of cycle of freezing and thawing.The precondition of control fissure to be damaged and expanded was put forward,and the calculation formulation of frost force on control fissure under freezing condition was established.The applicative method of the calculation formulation has been introduced through an engineering example,and several factors influencing the frost force on control fissure were analyzed.A theoretic foundation for deeper research on the mechanism of perilous rock to develop is established.

Key words: perilous rock, control fissure, cycle of freezing and thawing, frost force, calculation methods

摘要： 主控结构面的形成和扩展是研究危岩发育机理的核心。基于损伤力学、断裂力学、弹性力学等理论,对冻融循环条件下主控结构面的产生和扩展进行了研究。提出了主控结构面损伤扩展的条件,建立了冻结状态下作用在主控结构面上的冻胀力计算公式,通过工程实例给出了公式的运用方法,分析了影响主控结构面冻胀力大小的因素,为危岩发育机理的深入研究奠定了理论基础。

关键词: 危岩, 主控结构面, 冻融循环, 冻胀力, 计算方法