关键词: 高寒地区, 爆破振动传播, 边坡动态响应, 冻融效应, 数值模拟

Abstract: Blasting operations in open-pit mines in high-cold regions are significantly affected by low-temperature freezing. The difference in mechanical properties between frozen and unfrozen layers leads to abnormal vibration propagation and complicates the dynamic response of slopes. To reveal the in‐ fluence law of temperature field on the vibration attenuation mechanism and slope stability，an open-pit phosphate mine in a high-cold region was selected as the research object. Through comparative monitoring experiments in 3 periods of the severe cold period，the cool period and the melting period，the vibration propagation parameters under different temperature conditions were obtained. A 3D dynamic response mod‐ el of the slope considering the freeze-thaw effect was established by using ANSYS/LS-DYNA. Four freez‐ ing depth conditions were set，and the mechanism of the temperature-blasting coupling effect was system‐ atically analyzed. The research results show that in a low-temperature environment，the vibration attenua‐ tion coefficient decreases by 15% to 23%，and the main frequency shifts towards the low frequency by 8% to 12%. The freeze-thaw interface reflects 32% of the incident energy. The stiffness of the slope increases in the frozen state，but the stress concentration at the freeze-thaw interface is significant. The maximum ef‐ fective stress at the foot of the slope increases by 80.1% compared with the melting period，the plastic strain gradient reaches 0.000 18 m-1 ，and the bidirectional coupling effect of blasting vibration and slope response is obvious. A blasting vibration control method based on temperature zoning was established through research. By setting the threshold of the zoning，correcting the temperature of the charge quantity，optimizing the delay and reducing the charge at the interface，it provides a scientific basis for the safe pro‐ duction of open-pit mines in high-cold regions.

Key words: high-cold regions, blasting vibration propagation, dynamic response of slopes, freeze?thaw effect, numerical simulation