Dynamic behaviors of water-saturated and frozen sandstone subjected to freeze-thaw cycles

• DOI: 10.1016/j.jrmge.2022.11.007
• Publication Date: 2022-12-10T00:52:21Z
• Authors: Feng Gao; Cong Li; Xin Xiong; Yanan Zhang; Keping Zhou
• Keywords: Split Hopkinson Pressure Bar

In high-altitude cold areas, freeze-thaw (F-T) cycles induced by day-night and seasonal temperature changes cause numerous rock mass slope engineering disasters. To investigate the dynamic properties of in natural environment a area, standard specimens were drilled from Jiama copper mine Tibet, compression tests performed on water-saturated frozen sandstone with different numbers F-T (0, 10, 20, 30, 40) split Hopkinson pressure bar (SHPB) system cryogenic control system. The influence conditions performance was investigated. following conclusions are drawn: (1) With increasing strain rate, attenuation factor (λa) intensifying (λi) linearly increase. As number increases, dependence (λd) decreases, whereas λd increases. (2) prediction equation compressive strength is obtained, which can be used to predict after various based rate. (3) mesoscopic mechanism sandstone's evolution water softening effect causes decrease, strengthening pore ice it (4) decrease relative increase attributed increased porosity.