为探究冻融作用对灰岩物理力学特性的影响，对冻融循环0、20、40、60、80次的巴宿灰岩开展单轴压缩试验，分析了冻融劣化效应对岩石宏观物理力学参数及破坏模式的影响，探究了冻融损伤试样在单轴压缩条件下能量演化规律；其次，考虑冻融与荷载的耦合作用，基于广义Lemaitre应变等价性假设，基于Weibull分布函数理论建立冻融灰岩分段损伤本构模型。研究结果表明：灰岩的质量、弹性模量及抗压强度均随冻融次数的增加而降低，其破坏模式从单一张拉破坏向拉剪组合破坏转变，冻融循环60次和80次的破坏试样表现出明显的鼓胀效应，说明冻融作用使得灰岩出现延性破坏；在单轴压缩条件下，理论模型曲线与试验数据曲线在峰前段基本吻合，非压密段参数m是岩石塑性的重要指标，非压密段参数m从39.8降到了4.32，降低了89.15%，该模型揭示了灰岩由脆性向延性的转变。研究成果为季节性冻融岩土工程相关问题提供理论支撑。

In order to explore the damage law of freeze-thaw effect on the physical and mechanical properties of limestone, uniaxial compression tests were carried out on Basu limestone with 0,20,40,60 and 80 freeze-thaw cycles. The effects of freeze-thaw deterioration on the macroscopic physical and mechanical parameters and failure modes of rock were analyzed, and the energy evolution law of freeze-thaw damage samples under uniaxial compression was explored. Secondly, considering the coupling effect of freeze-thaw and load, based on the assumption of generalized Lemaitre strain equivalence, a piecewise damage constitutive model of freeze-thaw limestone with Weibull distribution was established. The results show that the mass, elastic modulus and compressive strength of limestone decrease with the increase of freeze-thaw cycles, and the failure mode changes from a single tensile failure to a combination of tensile and shear failure. The failure samples of 60 times and 80 times of freeze-thaw cycles show obvious bulging effect, indicating that freeze-thaw action causes ductile failure of limestone. Under the condition of uniaxial compression, the theoretical model curve is basically consistent with the experimental data curve in the pre-peak section. The non-compaction section parameter m is an important index of rock plasticity. The non-compaction section parameter m is reduced from 39.8 to 4.32, which is reduced by 89.15%. The model reveals the transformation of limestone from brittleness to ductility. The research results provide theoretical support for the related problems of seasonal geotechnical engineering.