ABSTRACT
In order to study the fatigue mechanical properties and fracture failure law of single fracture marble after freeze-thaw, we carry out a freeze-thaw cycle and periodic load tests on single fracture marble with three prefabricated dip angles, and use a camera to record the whole failure process of rock samples. The results show that with the increase of the fracture angle, the peak strength of marble with a single fracture before the freeze-thaw cycle decreases, and the damage of rock samples by the freeze-thaw cycle increases. The fatigue failure of rock samples after freezing and thawing is controlled by the static whole process curve. The amplitude of periodic load has a significant effect on the fatigue damage of rock samples, and the fatigue life of single fracture marble is not sensitive to the change of the fracture dip angle. There are significant differences in the failure modes of rock samples under static load and cyclic load. The secondary cracks are fully developed under cyclic load, which makes the rock samples show brittle failure characteristics. With the increase of the prefabricated dip angle, the penetration mode of the fracture surface of the rock sample becomes dominated by shear-tension composite failure. The research results can provide a reference for the stability evaluation and disaster prevention of fractured rock slopes in the cold region.
