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选取2008年极端冰雪受灾地区的灰色砂岩,通过扫描电镜试验、冻融循环试验和单轴压缩试验,探究了砂岩在极端冰雪条件下的破坏机理和物理力学性质。试验结果表明,灰色砂岩的冻融破坏主要是沿着试样沉积层理面(微结构面)出现、发展和贯通,层理面的破坏源于碎屑颗粒间填隙物的破坏;砂岩宏观冻融破坏模式的类型和冻融循环后力学性质的变化与其发育的沉积层理密度关系密切;表征砂岩单轴抗压强度或弹性模量随冻融循环次数变化关系的模型中,直线模型最为实用。
Gray sandstone in the area affected by extreme snow and ice in 2008 was selected to investigate the failure mechanism and physical and mechanical properties of sandstone under extreme ice and snow conditions by scanning electron microscopy, freeze-thaw cycling and uniaxial compression tests. The results show that the freeze-thaw damage of gray sandstone mainly occurs along the depositional bedding plane (microstructure plane) of the sample, and the failure of the bedding plane is caused by the destruction of interstitial spacers. The sandstone macro The type of freeze-thaw failure mode and the change of mechanical properties after freeze-thaw cycles are closely related to the developed depositional layer densities. Among the models that characterize the relationship between the uniaxial compressive strength or elastic modulus of sandstone and the number of freeze-thaw cycles, the linear model is the most practical.