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在各种复杂环境下,冻融循环作用后岩石的力学特性是岩石力学与工程中的一个重要课题。作者用四种不同浓度的硝酸溶液模拟实际工程中的工业废水,用400°高温处理后的岩石模拟实际工程中的高放射性核废料中的岩石。通过花岗岩在0%、1%、3%、5%四种浓度硝酸溶液和一组高温共同作用的冻融腐蚀循环实验,研究了岩石质量、峰值应力和峰值应变随酸性溶液浓度变化的规律,发现岩石在酸性环境下的冻融循环损伤更为严重。基于Rabtnov损伤力学的概念,得出损伤变量D变化曲线,揭示了花岗岩力学性能劣化与溶液浓度的关系,为今后冻融腐蚀循环条件下岩石力学性能的研究提供一定的试验、理论基础。
In a variety of complex environments, the mechanical properties of rocks after freeze-thaw cycles are an important issue in rock mechanics and engineering. The authors used four different concentrations of nitric acid solution to simulate the industrial wastewater in the actual project, and simulated the rock in the high-level nuclear waste in the actual project with the rock treated at 400 ° C. Through the freeze-thaw cycle experiments of granite with four concentrations of nitric acid solution of 0%, 1%, 3%, 5% and a set of high temperature, the law of rock quality, peak stress and peak strain with the concentration of acidic solution was studied. It is found that the rock is more damaged by freeze-thaw cycles in an acidic environment. Based on the concept of Rabtnov damage mechanics, the curve of damage variable D is obtained. The relationship between the deterioration of mechanical properties of granite and the concentration of solution is revealed, which provides some experimental and theoretical basis for the future research on the mechanical properties of rock under cyclic freeze-thaw cycles.