The influence of ice saturations on the mechanical properties of rocks in cold regions is of great significance for many engineering projects. This study adopted a nuclear magnetic resonance (NMR) technology to measure the different ice saturations of sandstone specimens accurately. The split Hopkinson pressure bar (SHPB) was espoused to conduct dynamic compressive tests on sandstone with different ice saturations at room (26 ͦ C) and various low temperatures of 0 ͦ C, −5 ͦ C, −10 ͦ C, −20 ͦ C, −30 ͦ C and − 40 ͦ C. The findings revealed an increase in the dynamic mechanical strength's parameters, including dynamic elastic modulus (E) and dynamic compressive strength of sandstone with decreasing temperatures from 0 °C to −20 °C. The dynamic mechanical strength of sandstone reaches its peak value when the temperature drops from −20 ͦ C to −30 ͦ C, and a reduction in dynamic strength is evidenced when the temperature declines from −30 ͦ C. The results indicated that the dynamic mechanical strength of dry and fully saturated sandstone initially increased and then decreased when the temperature reached −40 °C, showing a clear negative trend. A reduction in temperature increases the dynamic mechanical strength of unsaturated sandstone, and the lower saturation leads to a more pronounced enhancement effect. Furthermore, the E and strength damage factors elucidate that varying ice saturations greatly affect the strength of sandstones with different porosities.

中文翻译：

---

冰饱和度和零下温度对砂岩动态力学特性影响的实验研究

冰饱和度对寒区岩石力学性质的影响对于许多工程项目具有重要意义。本研究采用核磁共振（NMR）技术来准确测量砂岩标本的不同冰饱和度。采用分体式霍普金森压力棒（SHPB）在室温（26℃）和0℃、-5℃、-10℃、-20℃各种低温下对不同冰饱和度的砂岩进行动态压缩试验。 C、-30 ͦ C 和 - 40 ͦ C。研究结果表明，随着温度从 0 °C 降低到 -20 °C，砂岩的动态机械强度参数（包括动态弹性模量 (E) 和动态压缩强度）增加。当温度从-20℃降至-30℃时，砂岩的动态力学强度达到峰值，当温度从-30℃降至-30℃时，动态力学强度明显下降。干燥完全饱和砂岩的强度在温度达到-40℃时先增大后减小，呈现明显的负趋势。温度降低会提高非饱和砂岩的动态机械强度，饱和度越低，增强效果越明显。此外，E 和强度损伤因子表明，不同的冰饱和度极大地影响了不同孔隙率砂岩的强度。