关键词: 冻融循环　应力波传播　岩杆　节理岩体　ANSYS/LS-DYNA

Abstract: The structural damage of rock masses in high-altitude cold regions,caused by long-term freeze-thaw cycles, significantly affects the propagation behavior of stress waves,which in turn influences blasting disturbance responses and slope stability.This study conducted freeze-thaw cycle experiments on granite samples to test the physical and mechanical parameters of the rock under different freeze-thaw cycles.Using LS-DYNA software,a numerical model was established to analyze the propagation characteristics of stress waves in both intact rock rods and rock rods with fractures.The results show that as the number of freeze-thaw cycles increases,the rock′s strength and elastic modulus decrease,and the stress wave propagation ve locity slows down.The increase in the thickness,number,and spacing of ice-filled fractures leads to an intensification of stress wave attenuation,but the rate of change gradually stabilizes.The interaction between freeze-thaw cycles and fracture geometry parameters determines the dominant factors influencing stress wave attenuation,with the effects of fracture thickness and num ber being significantly greater than those of fracture spacing and freeze-thaw cycles.The study reveals the propagation laws of stress waves in ice-filled jointed rock masses,providing theoretical support for blasting vibration research in cold regions.

Key words: freeze-thaw cycle,stress wave propagation,rock bar,jointed rock mass,ANSYS/LS-DYNA