Vibration mitigation in saturated soil by periodic pile barriers

Meng, Lingkai; Cheng, Zhibao; Shi, Zhifei

doi:10.1016/j.compgeo.2019.103251

Cited by 46 publications

(14 citation statements)

References 49 publications

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“…Wang et al [26,27] studied wave propagation in one-dimensional and two-dimensional fluid-saturated porous metamaterials (FSPM). Shi et al [28,29,30] investigated the mitigation of vibrations in saturated soil with periodic pile barriers.…”

Section: Introductionmentioning

confidence: 99%

Wave propagation in one-dimensional fluid-saturated porous phononic crystals with partial-open pore interfaces

Zhang

Yan

Wang

et al. 2021

International Journal of Mechanical Sciences

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The propagation of waves in fluid-saturated porous periodic structures is significantly affected by the interface condition between adjacent layers. We consider in this paper the partial-open pore interface condition between adjacent layers in a one-dimensional fluid-saturated porous phononic crystal. A transfer matrix method is devised to obtain both the complex band structure and the poroelastic Bloch waves of the crystal. Spectral transmission through a finite structure is further computed by a stiffness matrix method. Attention is restricted to normal incidence of longitudinal waves. The influence of the pore blockage, a parameter of the partial-open pore interface condition, and of porosity and viscosity are investigated. The value of the pore blockage is found to influence significantly both the dispersion of poroelastic waves but

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Section: Introductionmentioning

confidence: 99%

Wave propagation in one-dimensional fluid-saturated porous phononic crystals with partial-open pore interfaces

Zhang

Yan

Wang

et al. 2021

International Journal of Mechanical Sciences

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“…Miniaci et al [25] investigated the parameters that affect band gaps of SMM by carrying out a numerical analysis with large-scale mechanical metamaterials, which are made of cavities or rubber/steel/concrete-infilled inclusions. Numerous scholars have also investigated the band gaps of SMM by adopting an array of piles, which possess an excellent performance in mitigating vibrations [19,20,26]. Despite the recent advances in this field, the SMM is mostly designed for shielding seismic waves from earthquakes.…”

Section: Introductionmentioning

confidence: 99%

Seismic metamaterial barriers for ground vibration mitigation in railways considering the train-track-soil dynamic interactions

Kaewunruen

2020

Construction and Building Materials

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With the rapid development of high speed rail system, ground vibration mitigation solutions are desperately needed. Based on the concepts of phononic crystals, seismic metamaterial, which is a novel vibration mitigation method, can theoretically yield excellent performance in shielding dynamic propagation waves in broad frequency bands. However, the application of seismic metamaterials in railway-induced vibration mitigation is a recent and ongoing topic. Therefore, this study aims to create new contribution towards a better understanding into the mitigation effects by seismic metamaterials for railway-induced ground vibrations. The seismic metamaterials are made of an array of concrete inclusions in this study. The dispersion theory for seismic metamaterials is proposed for analyzing the theoretical band gaps. A 3D coupled train-track-soil interaction model is also developed based on the multi-body simulation principle, finite element theory, and perfectly matched layers method using LS-DYNA. The dimensions of seismic metamaterials are determined based on the dominant frequencies of vibration accelerations in natural ground. When the seismic metamaterials are adopted in railway ground, the vibration responses are investigated in both time and frequency domains to illustrate the mitigation effects. Finally, the numbers of inclusions, initial distances, and train speeds are changed to investigate their influences on shielding effects. The insight from this study provides a new and better understanding of attenuating ground vibrations using seismic metamaterials in high speed railways.

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“…Metaconcrete is a promising material for applications in civil engineering, because inclusions can be tailored to attenuate specific frequencies of interest. For instance, it would be worth to address its effectiveness in seismic applications considering greater inclusions regularly arranged as the periodic pile barriers proposed in [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Fig.8Visualization of the distribution of the global eigenfrequencies of the entire specimens as obtained by the impact experiments. Legenda entries refer to the mode shape (T,L) and to the specimen group(1,2,3,4). Shaded vertical lines visualize the eigenfrequencies of the inclusions, estimated numerically…”

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confidence: 99%

Experimental Validation of the Attenuation Properties in the Sonic Range of Metaconcrete Containing Two Types of Resonant Inclusions

et al. 2020

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Background Metaconcrete is a new concept of concrete, showing marked attenuation properties under impact and blast loading, where traditional aggregates are partially replaced by resonant bi-material inclusions. In a departure from conventional mechanical metamaterials, the inclusions are dispersed randomly as cast in the material. The behavior of metaconcrete at supersonic frequencies has been investigated theoretically and numerically and confirmed experimentally. Objective The feasibility of metaconcrete to achieve wave attenuation at low frequencies demands further experimental validation. The present study is directed at characterizing dynamically, in the range of the low sonic frequencies, the—possibly synergistic—effect of combinations of different types of inclusions on the attenuation properties of metaconcrete. Methods Dynamic tests are conducted on cylindrical metaconcrete specimens cast with two types of spherical inclusions, made of a steel core and a polymeric coating. The two inclusions differ in terms of size and coating material: type 1 inclusions are 22 mm diameter with 1.35 mm PDMS coating; type 2 inclusions are 24 mm diameter with 2 mm layer natural rubber coating. Linear frequency sweeps in the low sonic range (< 10 kHz), tuned to numerically estimated inclusion eigenfrequencies, are applied to the specimens through a mechanical actuator. The transmitted waves are recorded by transducers and Fast-Fourier transformed (FFT) to bring the attenuation spectrum of the material into full display. Results Amplitude reductions of transmitted signals are markedly visible for any metaconcrete specimens in the range of the inclusion resonant frequencies, namely, 3,400-3,500 Hz for the PDMS coating inclusions and near 3,200 Hz for the natural rubber coating inclusions. Specimens with mixed inclusions provide a rather uniform attenuation in a limited range of frequencies, independently of the inclusion density, while specimens with a single inclusion type are effective over larger frequency ranges. With respect to conventional concrete, metaconcrete reduces up to 90% the amplitude of the transmitted signal within the attenuation bands. Conclusions Relative to conventional concrete, metaconcrete strongly attenuates waves over frequency bands determined by the resonant frequencies of the inclusions. The present dynamical tests conducted in the sonic range of frequencies quantify the attenuation properties of the metaconcrete cast with two types inclusions, providing location, range and intensity of the attenuation bands, which are dependent on the physical-geometric features of the inclusions.

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Vibration mitigation in saturated soil by periodic pile barriers

Cited by 46 publications

References 49 publications

Wave propagation in one-dimensional fluid-saturated porous phononic crystals with partial-open pore interfaces

Wave propagation in one-dimensional fluid-saturated porous phononic crystals with partial-open pore interfaces

Seismic metamaterial barriers for ground vibration mitigation in railways considering the train-track-soil dynamic interactions

Experimental Validation of the Attenuation Properties in the Sonic Range of Metaconcrete Containing Two Types of Resonant Inclusions

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