Feasibility of vibration mitigation in unsaturated soil by periodic pile barriers

Wu, Liangliang; Shi, Zhifei

doi:10.1016/j.compgeo.2023.105798

Cited by 4 publications

(3 citation statements)

References 60 publications

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“…The transient responses and their Fourier spectrum at point M for the unsaturated and saturated soil embedded with and without the periodic wave barrier are presented in figure 10. As reported [52,70], the effect of matrix suction can be neglected and unsaturated soil can be degraded to a liquid-saturated condition when S l 1. In order to avoid the denominator being 0 when S l is taken to be 1 in the numerical calculations, we take S l = 1 − 10 −4 .…”

Section: Application In Ambient Vibration Isolationmentioning

confidence: 96%

“…On the other hand, in most finite element software, there is no module that can directly analyse the dynamic behaviour of unsaturated soils. Recently, based on the complex band structure, we successfully isolated bulk waves by a periodic pile barrier in unsaturated soil [52]. It was found that the attenuation zone of the periodic pile barrier is highly dependent on the saturation, and the periodic pile barrier is based on Bragg scattering mechanism, which opens up an attenuation zone in a relatively higher frequency range in unsaturated soil.…”

Section: Introductionmentioning

confidence: 99%

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Broadband surface wave manipulation by periodic barriers in unsaturated soil

Wu,

Shi

2024

Phil. Trans. R. Soc. A.

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Periodic wave barriers have been widely used to manipulate elastic waves propagating in saturated and single-phase soil due to their attenuation zone properties. However, it is difficult to promote application of periodic barriers in unsaturated soils due to their complex constitutive relationship. In this study, manipulation of surface waves by periodic in-filled trench barriers in unsaturated soil has been studied based on the periodic theory. The dispersion relations of a periodic structure for surface waves in unsaturated soil are determined. The attenuation mechanism of evanescent surface waves is revealed. Next, the effects of several key parameters of unsaturated soil on the attenuation zones of the periodic in-filled trench barriers are comprehensively discussed. It is found that in a particular range for material parameter, the surface waves are attenuated over the entire frequency range due to the viscosity of fluid. Finally, a periodic in-filled trench barrier is designed according to a field test of ground vibration induced by a train, and its performances in mitigating surface waves propagating in unsaturated and saturated soils are conducted and compared by conducting analysis in time domain. This investigation provides a new insight for manipulating surface waves by periodic barriers. This article is part of the theme issue ‘Current developments in elastic and acoustic metamaterials science (Part 1)’.

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Section: Application In Ambient Vibration Isolationmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Broadband surface wave manipulation by periodic barriers in unsaturated soil

Wu,

Shi

2024

Phil. Trans. R. Soc. A.

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“…In the field, the subgrade soil is frequently unsaturated and subjected to continuous varieties in degree of temperature, water content and suction (Jin, Lee, & Kovacs, 1994;McCartney & Khosravi, 2013). Numerous studies of experimental and theoretical approaches (François & Laloui, 2008;Uchaipichat & Khalili, 2009;Wu & Shi, 2023) stated that partially saturated soils behavior depends mainly on both suction and degree of temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of degree of saturation on stresses and pore water pressure in the subgrade layer caused by railway track loading

Fattah,

Majeed,

Joni

2024

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PurposeThe experiments of this study investigated the effect of the subgrade degree of saturation on the value of the stresses generated on the surface and the middle (vertical and lateral stresses). The objectives of this study can be identified by studying the effect of subgrade layer degree of saturation variation, load amplitude and load frequency on the transmitted stresses through the ballast layer to the subgrade layer and the stress distribution inside it and investigating the excess pore water pressure development in the clay layer in the case of a fully saturated subgrade layer and the change in matric suction in the case of an unsaturated subgrade layer.Design/methodology/approachThirty-six laboratory experiments were conducted using approximately half-scale replicas of real railways, with an iron box measuring 1.5 x 1.0 × 1.0 m. Inside the box, a 0.5 m thick layer of clay soil representing the base layer was built. Above it is a 0.2 m thick ballast layer made of crushed stone, and on top of that is a 0.8 m long rail line supported by three 0.9 m (0.1 × 0.1 m) slipper beams. The subgrade layer has been built at the following various saturation levels: 100, 80, 70 and 60%. Experiments were conducted with various frequencies of 1, 2 and 4 Hz with load amplitudes of 15, 25 and 35 kN.FindingsThe results of the study demonstrated that as the subgrade degree of saturation decreased from 100 to 60%, the ratio of stress in the lateral direction to stress in the vertical direction generated in the middle of the subgrade layer decreased as well. On average, this ratio changed from approximately 0.75 to approximately 0.65.Originality/valueThe study discovered that as the test proceeded and the number of cycles increased, the value of negative water pressure (matric suction) in the case of unsaturated subgrade soils declined. The frequency of loads had no bearing on the ratio of decline in matric suction values, which was greater under a larger load amplitude than a lower one. As the test progressed (as the number of cycles increased), the matric suction dropped. For larger load amplitudes, there is a greater shift in matric suction. The change in matric suction is greater at higher saturation levels than it is at lower saturation levels. Furthermore, it is seen that the load frequency value has no bearing on how the matric suction changes. For all load frequencies and subgrade layer saturation levels, the track panel settlement rises with the load amplitude. Higher load frequency and saturation levels have a greater impact.

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Bulk wave manipulation by periodic in-filled barriers in unsaturated soil

Wu,

Shi

2024

Engineering Structures

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Feasibility of vibration mitigation in unsaturated soil by periodic pile barriers

Cited by 4 publications

References 60 publications

Broadband surface wave manipulation by periodic barriers in unsaturated soil

Broadband surface wave manipulation by periodic barriers in unsaturated soil

Effect of degree of saturation on stresses and pore water pressure in the subgrade layer caused by railway track loading

Bulk wave manipulation by periodic in-filled barriers in unsaturated soil

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