Study on vibration isolation performance of composite multilayer wave impeding block based on wave impedance ratio under an underground dynamic load

Based on the theory of single-phase elastic medium and unsaturated porous medium, vibration isolation effect composite multilayer wave impeding block (WIB) in ground under an underground dynamic load is investigated. The results show that best can be obtained by designing impedance ratio between WIB ground. improves vibration-damping bandwidth compared with homogeneous WIB. better closer embedded depth to source, its increases significantly increase thickness, but when thickness exceeds a certain critical decreases thickness. Soil saturation has significant ground, achieve at low saturation.