Study on vertical vibration and transmission characteristics of railway ballast using impact hammer test

The vertical vibration and transmission characteristics of ballast are key factors that affect the dynamic stability railway track structures control settlement ballasted beds. Therefore, following study was conducted to explore this topic. Firstly, through an impact hammer test on a sensor with embedding chip, data accurately measured. single can be studied. Then, at different positions in stack were obtained by sensors into stack. Finally, combined field tests, discrete element numerical model established, then speed diffusion angle calculated. results show damping ratio particles is less than 0.1, natural frequency above 1000 Hz. ballasts greatly affected their shape. greater particles, its lower. This indicates has attributes soft material. acceleration rate lower frequencies below 257.94 shows suppression ability bed better range. As depth increases, gradually decreases, as does accumulated external force. In box, average calculated 0.88 mm/?s, transmitted downward 35.32°–54.51° from direction gravity.