Vibration reduction analysis of new barriers in large model experiment

A large model box was developed in our experiment to study the vibration reduction effect. Five hydraulic high-performance actuators are arranged in the upper part of the model box. There is a time difference between adjacent actuators, which can simulate the train induced vibration. To reduce vibration a composite barrier is designed; the barrier consists of a honeycomb concrete canvas and PE polymer water bags. The concrete canvas can be mixed with water to produce a hydration reaction to form a structure with a certain hardness. By simulating different train speeds and loads, vertical vibration velocity, and acceleration before and after the barrier are compared and analyzed. The experimental results show that the new barrier can achieve a good vibration reduction effect. When the simulated train speed increases, the damping effect of the barrier is improved. At a speed of 180 km/h, an amplitude of 1.5 m after the barrier is found to be 48.6% lower than that before the barrier. Velocity decreases by 24.2% at 36 km/h and by 38.1% at 108 km/h.