关键词: 高差场地, 环境振动, 桩-筏基础, 振动传播特性, 减振效果

Abstract: With the development of road traffic, the problem of environmental vibration has become increasingly prominent, especially in areas with high elevation differences where systematic research is still lacking. Based on the onsite measurement and finite element simulation of a high elevation difference raft foundation site in Taiyuan, the propagation characteristics of traffic vibration in high elevation difference terrain and the vibration damping effect of pile-raft foundation were analyzed. Research shows that after the vibration is transmitted from the stage to the stage, it presents obvious anisotropic directions. The RMS value of the velocity in the X direction is amplified by 31%, attenuated by 21% in the Z direction, and changes relatively little in the Y direction. The spectral characteristics have undergone significant changes, with a peak frequency shift occurring in the X direction. Finite element analysis shows that the vibration damping effect of pile-raft foundation improves with the increase of raft slab thickness, and the improvement in the horizontal direction is better than that in the vertical direction. When the thickness of the raft is 1.5m, the VC vibration levels in all three directions can be controlled below VC-D. The comprehensive results show that the adoption of a 1.5 meter-thick pile-raft foundation in the soil-like high elevation difference site in Taiyuan can achieve effective vibration control, providing an important reference for the engineering vibration prevention design under similar terrain conditions.

Key words: High Elevation Difference Site, Environmental Vibration, Pile-Raft Foundation, Vibration Propagation Characteristics, Vibration Damping Effect