Vibration Reduction Of Periodic Filled Trenches In Layered Soil

Considering the stability of soil and the wavelength of incident elastic wave,filling trench as an effective continuous wave vibration isolation barrier has been widely used in practical engineering.However,the current research has some limitations,such as:(1)Considering the dispersion characteristics of the surface waves filled in the trench,the research is mostly for a single soil layer,without considering the stratification of the soil and its diversity characteristics;(2)Even though the literature studies the steady-state response of layered foundations under the action of Rayleigh surface waves,these studies are mostly directed to non-continuous barriers(row piles)rather than periodically filling trenches;(3)For the vibration isolation and vibration reduction problem in the layered soil using periodic filling trenches,the related results of the attenuation domain using the equivalent method system have not been found yet.For this reason,this paper systematically studies the vibration reduction characteristics of filled trenches in layered soil by means of the energy distribution parameter criterion identification method.The main contents are as follows:(1)Based on the periodic structure theory,using the COMSOL finite element analysis software,the energy distribution parameter identification criterion is used to solve the surface wave dispersion of the periodic filling trenches in the layered single-phase soil,the layered saturated soil and the mixed soil layer.Curves that determine their respective attenuation domains;(2)Degrading the parameters of the simplified unit cell model,verifying the correctness of the model;comparing the similarities and differences of the periodic filling groove attenuation domains in different types of layered soil;(3)The numerical analysis model of the finite periodic filling trench-layered soil structure is established,and the frequency domain response analysis is completed,which verifies the feasibility of using the periodically filled trench for vibration isolation;(4)From the perspective of attenuation domain and frequency domain response,the effects of physical and geometric factors on the vibration isolation effect of periodically filled trench-layered soil structure are studied;(5)By introducing the soil layer participation coefficient,the layered soil is equivalent to a kind of isotropic soil,and the attenuation domain of the periodic filling trenches is systematically studied to simplify the calculation process of the attenuation domain.The feasibility of the equivalent method is verified by comparing with the frequency domain response analysis of numerical simulation.This paper finds that the energy distribution parameter criterion based on single-phase soil can be used to identify the surface wave in the periodically filled trench-layered soil structure;In the saturated soil,due to the existence of pore water,the corresponding attenuation domain range is shifted to the low frequency relative to the single-phase soil;By designing the filling trench-layered soil structure parameters,the frequency regulation of the environmental vibration isolation frequency domain can be realized;by designing the filling trench-layered soil structure parameters,the frequency regulation of the environmental vibration isolation frequency domain can be realized;By introducing the soil participation coefficient,the layered soil is equivalent to the isotropic soil,and it is feasible to solve the attenuation domain of the periodically filled trench.