中文摘要：

通过循环冻融和相似材料试验，研究了节理岩体在冻融条件下的损伤破坏机制及其相应的力学特性。通过对经历冻融循环后的试件损伤破坏模式的观察和单轴压缩试验，重点研究了节理倾角、节理贯通度、节理条数、节理充填物厚度、节理充填物类型、试件饱和度、冻融循环次数等对试件冻融损伤破坏模式、单轴抗压强度和弹性模量的影响。研究发现：节理存在及其物理力学性质对岩体的冻融损伤破坏模式及强度均有很大影响。节理倾角通过影响冻融裂纹的起裂位置进而影响其破坏模式和强度；随着贯通度的增加，试件表面裂纹由稀变密；随着节理条数增加，试件受冻融影响明显加剧；随着节理充填物厚度增加，试件冻融损伤程度先增加后减小；节理充填物类型对试件冻融损伤程度也有一定影响；随着试件饱和度的增加，试件冻融损伤程度先减小后增加；随着冻融循环次数的增加，节理试件表面因冻胀引起的裂纹逐渐增多、变宽，且其抗冻融特性较完整试件差。上述研究成果对寒区岩体工程建设及安全运营具有重要的参考价值。

英文摘要：

The damage failure mechanism and mechanical characteristics of jointed rock mass have been studied through freezing-thawing cycles and similar material test method. Through the observation of the damage failure modes and uniaxial compression testof the samples after freezing-thawing cycles, the effects of joint dip angle, joint continuity degree, joint set, joint filling depth, sort ofjoint filling, sample＇s saturation degree and number of cycles on the damage failure mode, uniaixal compression strength and elasticmodulus are studied. It is shown that the existence of joint and its physico-mechanical properties have much effect on the damagefailure modes and strength. The joint dip angle affects the failure modes and strength by affecting the occurrence position offreezing-thawing cracks. The cracks become more with joint continuity degree. The effect of freezing-thawing on the samplesbecomes worse with number of joints. The freezing-thawing damage degree first increases then decreases with joint filling depth. Thesort of joint filling has certain effect on the freezing-thawing damage degree. The freezing-thawing damage degree first decreasesthen increases with the sample＇s saaa＇ation degree. The cracks become more and wider with the number of cycles; and itsanti-freezing-thawing property is worse than that of the intact one. The above research conclusions can provide valuable references tothe constructions and safety operation of rock mass projects in cold regions.