酸性与高温环境下花岗岩力学性能试验研究

Studying the Experimental of Mechanical Properties of Granite Under Acid and High Temperature

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。

It is an important topic in rock mechanics and rock engineering to study the mechanical proper- ties of rocks under the variety of environments freeze-thaw cycles. Four different concentrations of ni- trate solution were used to simulate industrial waste water in the actual project and used 400 degrees high temperature treatment of the rock to simulation the rock in the high-level radioactive nuclear waste in the actual project. The variation rule of the rock quality, peak stress and peak strain under the influence of freeze-thaw cycle at 0 %, 1%, 3 %, 5 % four concentrations of nitric acid and high temperature was stud- ied by experimental tests. The results show that the rock under the action of the acidic environment in the freeze-thaw corrosion damage is more serious o Based on the concept of damage mechanics of Rabtnov, damage variable D curves were gotten and the relationship between the degradation of granite＇s mechani- cal properties and the concentration was revealed, which provided some experimental and theoretical basis for the further study of the mechanical properties under the freeze-thaw cycling conditions.