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为研究冻融循环作用下硬性岩的力学及损伤特性,以某拟建水电站坝区英安岩为例,开展了室内饱水状态下岩石的冻融循环、电镜扫描、单轴压缩、三轴压缩等试验,建立了冻融荷载耦合作用下较为真实的岩体损伤本构模型,分析了高寒山区冻融英安岩的力学性质及损伤特性。结果表明,冻融循环使岩样发生了裂隙扩展和颗粒析出;单轴压缩条件下,岩样破坏以单轴压缩产生的受荷损伤为主,有限的冻融循坏对英安岩(硬性岩)造成的损伤有限;三轴压缩条件下,随着循环次数的增加岩样损伤增加,随着围压增加岩样损伤有所减弱,且英安岩对围压的敏感性大于冻融循环。
In order to study the mechanics and damage characteristics of hard rock under freeze-thaw cycles, taking the dacite of the proposed hydropower station as an example, the freeze-thaw cycles, scanning electron microscopy, uniaxial compression, triaxial Compression and other tests to establish a more realistic frozen rock damage constitutive model under the action of freeze-thaw load coupling, and analyze the mechanical properties and damage characteristics of freezing-thawing dacite in the alpine area. The results show that the freeze-thaw cycles lead to the crack propagation and particle precipitation. Under uniaxial compression, the damage of rock specimen is dominated by the uniaxial compression, and the limited freeze-thaw cycles affect the formation of dacite Rock). Under triaxial compression, the damage of rock samples increases with the increase of circulation number, and the damage of rock samples decreases with the increase of confining pressure. And the sensitivity of dacite to confining pressure is greater than that of freeze-thaw cycles .