The fatigue damage theory has been proven to be practical in estimating the damage of rock subjected to the repeated action of freezing and thawing. The application of the established frost fatigue model in the calculation of rock damage in the natural environments still faces several challenges,for instance,how to simplify the complicated natural freezing and thawing action,how to define the damage variable reasonably and how to calculate the frost damage of rock caused by the joint action of multiple mech...