摘要：The rapid development of the domestic econ- omy has stimulated the demand for construction in cold areas. In recent years, a large number of domes- tic construction projects have been slowly trans- ferred to cold areas. For example, construction and transportation are facing increasingly serious prob- lems due to the extremely cold weather in the coldareas. The freezing and thawing disasters of rocky slopes in cold regions are one of the major problemsthat must be solved in slope engineering. Therefore. it is of great value to study the stability of rock slopes in cold regions. In this paper, the freeze-thaw cycle test is selected for research, and the mechanical char- acteristics ofthe freeze-thaw damage ofthe fractured rock mass and the mechanism of fracture failure are carefully analyzed. The uniaxial experiments and freeze-thaw cycle mechanics tests will be used tostudy the mechanical properties of fractured rock masses freeze-thaw damage and explore the cou- pling effect of freeze-thaw on the fractured rock masses and the law of changes in the damage caused The research results show that: (1) We use the same type of rock mass (2 pieces of YI type rock mass) as the research sample to pass the cyclic freeze-thawtest. From 25 freeze-thaw cycles to 65 freeze-thaw cycles, the initial 5.5mm gradually increases to 19mm. By the end of the test, large-scale cracking occurred on the surface of the rock mass: (2) Under the combined action of a single load and a freeze-thaw environment, the damage of the fractured rock samples (Y1-Y4) is deeper than the intact rock sam- ple, indicating that the length of the cracks and the number of freeze-thaw cycles of the rock sample have a great influence on the damage of the rock, andthe inclination angle of the cracked rock has a rela- tively small influence on its mechanical damage. Rock freeze-thaw damage belongs to fatigue failure. The effect of load and freeze-thaw on rock damage has significant nonlinear characteristics, and the cou- pling effect makes the total damage slowly weak- ened. The initial damage situation and rock lithology determine the freeze-thaw cycle and damage expan- sion feature.
关键词：Cracked rock mass;mechanical experiment;freeze-thaw damage;failure mechanism
