Abstract The moisture environment where the rock is located during the freeze-thaw (F-T) weathering plays a significant role in the deterioration of physical and mechanical properties. This study explores the effect of the moisture conditions on the degradation of the granite dynamic mechanical properties during F-T cycles. Saturated granite samples were positioned in varying moisture conditions (i.e., sealed with cling wrap, half-submersion and completely submersion in water) when they were under different F-T cycles ranging from 20 to 100. Dynamic tensile and compression tests were performed on the fresh and the weathered samples. By appropriately adjusting the gas pressure, the loading rate was controlled in the range of 471–563 GPa/s for the dynamic tensile test and 1944–2144 GPa/s for the dynamic compression test. The deterioration characteristics were examined by the changes in the open porosity, P-wave velocity, and dynamic tensile and compressive strengths. The experimental results for the sealed samples indicate that with the increase of the F-T cycles the moisture content is unchanged while the degree of saturation slightly decreases. Whereas in the half- and completely submerged samples the moisture content slightly increases and the degree of saturation remains. Furthermore, the water migration activities in half-submerged samples are more pronounced than completely submerged samples. The half-submerged samples having the highest degree of saturation are more susceptible to the F-T weathering and therefore, exhibit the lowest dynamic mechanical properties followed by the completely submerged samples and the sealed samples.

中文翻译：

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冻融风化导致花岗岩动态力学性能劣化：考虑水分条件的影响

摘要 岩石在冻融（FT）风化过程中所处的潮湿环境对物理力学性能的恶化起着重要作用。本研究探讨了湿度条件对 FT 循环过程中花岗岩动态力学性能退化的影响。当饱和花岗岩样品处于 20 到 100 的不同 FT 循环下时，它们被放置在不同的湿度条件下（即用保鲜膜密封、半浸没和完全浸没在水中）。对新鲜和风化样品。通过适当调节气压，动态拉伸试验的加载速率控制在471-563 GPa/s，动态压缩试验的加载速率控制在1944-2144 GPa/s。通过开放孔隙率、P 波速度和动态拉伸和压缩强度的变化来检查劣化特性。密封样品的实验结果表明，随着FT循环次数的增加，水分含量不变，而饱和度略有下降。而在半浸没和完全浸没的样品中，水分含量略有增加，饱和度保持不变。此外，半浸水样品中的水迁移活动比完全浸水样品更明显。具有最高饱和度的半浸没样品更容易受到 FT 风化的影响，因此表现出最低的动态机械性能，其次是完全浸没的样品和密封的样品。