Study on the Distribution Laws of Three-Dimensional Vibration Field of Railway Subgrade during Vibratory Crushing and Compaction
The compaction quality of railway roadbed fill ensures safe operations under cyclic vehicle loading during the operational phase,while the synergistic effect between the self-weight of the roller and the excitation vibration wave is pivotal in achieving effective fill compaction.Therefore,it is of decisive significance to elucidate the three-dimensional vibration field distribution laws of the vibration wave during the rolling process for improving the compaction quality.By establishing a vibratory roller-filler coupling finite element numerical simulation model,the vibration wave propagation laws in three dimensions in the subgrade is revealed,and the theoretical distribution equation of the vibration field of the railroad subgrade is constructed.According to the subsequent vibratory compaction field test,this paper establishes the distribution equation of the field vibration in the vibratory milling process and determines the effective compaction range.The results show that the vibration wave acceleration amplitude during vibratory crushing and compaction shows an exponential decay within the subgrade fill,and the three-dimensional vibration field shows an ellipsoidal distribution;the key parameters such as longitudinal wave speed,transverse wave speed and acceleration amplitude attenuation coefficient of the subgrade fill under the field measurement conditions are clarified,and the distribution equation of the effective compaction range of the subgrade fill is formulated by taking 86％attenuation of the vertical acceleration amplitude of the roadbed fill as the threshold for effective compaction range.The results of the study provide a theoretical foundation for understanding vibration wave distributions in the three-dimensional vibration field of railroad subgrade fill during vibratory crushing and compaction.
Railway subgradeFillerCompaction qualityThree-dimensional vibration fieldNumerical simulationVibration wave velocityEffective compaction range
万方数据
维普
