Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (1): 217-231.doi: 10.16285/j.rsm.2022.0210

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Isolation effect of S-wave by composite multilayer wave impeding block in unsaturated soil

SHU Jin-hui1, MA Qiang1, 2, CHANG Li-jun1, 2   

  1. 1. School of Civil Engineering, Qinghai University, Xining, Qinghai 810016, China; 2. Qinghai Provincial Key Laboratory of Energy-saving Building Materials and Engineering Safety, Xining, Qinghai 810016, China
  • Received:2022-02-24 Accepted:2022-04-22 Online:2023-01-16 Published:2023-01-13
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (52168053) and the Qinghai Province Science and Technology Department Project (2021-ZJ-943Q).

Abstract: Based on the propagation theory of elastic waves in unsaturated porous medium and single-phase elastic medium, considering that a composite multilayer wave impeding block(WIB) with a certain thickness is set in unsaturated soil (composite multilayer wave impeding block with three layers as an example), analytical solutions of transmitted/reflected amplitude ratio of S-wave passing through a composite multilayer wave impeding block in unsaturated soil foundation are derived by using Helmholtz vector decomposition theorem. The influences of physical and mechanical parameters such as shear modulus and density of interlayer wave impeding block on the propagation characteristics of S-wave passing through composite multilayer wave impeding block in unsaturated soil are analyzed by numerical examples. The results show that the shear modulus and the density of interlayer wave impeding block material have significant influences on the transmission/reflection coefficient. Therefore, the composite multilayer wave impeding block is an effective vibration isolation barrier, and a better vibration isolation performance can be obtained by strictly controlling the shear modulus and density of interlayer wave impeding block, which provides theoretical guidance for the application of composite multilayer wave impeding block in the field of foundation vibration control.

Key words: unsaturated soil, composite multilayer wave impeding block, isolation effect, reflection amplitude ratio, transmission amplitude ratio

CLC Number: 

  • TU 435
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