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

Meng Zhang; Qiang Ma

doi:10.1590/1679-78257439

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

Authors

Meng Zhang School of Civil Engineering, Qinghai University, Xining 810016, China https://orcid.org/0000-0002-6881-4946
Qiang Ma School of Civil Engineering, Qinghai University, Xining 810016, China / bQinghai Provincial Key Laboratory of Energy-saving Building Materials and Engineering Safety, Xining 810016, China https://orcid.org/0000-0002-5692-3782

DOI:

https://doi.org/10.1590/1679-78257439

Abstract

Based on the theory of single-phase elastic medium and unsaturated porous medium, the vibration isolation effect of composite multilayer wave impeding block (WIB) in the unsaturated ground under an underground dynamic load is investigated. The effects of the wave impedance ratio, thickness, embedded depth, load frequency, and soil saturation on the vibration isolation performance of the composite multilayer WIB are analyzed. The results show that the best vibration isolation effect can be obtained by designing the wave impedance ratio between the composite multilayer WIB and unsaturated ground. The composite multilayer WIB improves the vibration damping bandwidth compared with the homogeneous WIB which can realize the control of vibration of different target frequencies (5Hz£f£100Hz). The vibration isolation effect is better the closer the embedded depth of the composite multilayer WIB is to the vibration source, and its vibration isolation effect increases significantly with the increase of thickness, but when the thickness of the WIB exceeds a certain critical thickness, its vibration isolation effect decreases with the increase of thickness. Soil saturation has a significant effect on the vibration isolation effect of composite multilayer WIB in the unsaturated ground, and the composite multilayer WIB can achieve a better vibration isolation effect at low saturation.

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Published

2023-02-10

Issue

Vol. 20 No. 2 (2023)

Section

Articles

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