3-D simulation for broadband scattering of Rayleigh wave by&nbsp; discontinuous barrier based on FMP-IBEM

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (19) : 89-97.

3-D simulation for broadband scattering of Rayleigh wave by discontinuous barrier based on FMP-IBEM

LIU Zhong-xian1,3, Fu Zhan-yuan1，Miao Yu2, Wang Zhi-kun1, Li Chang-jun1

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Abstract

Here, based on the single-layer potential theory, the fast multi-pole indirect boundary element method (FMP-IBEM) was extended to solve broadband scattering of elastic wave by group of piles in an elastic half-space. Then, vibration isolation effect of multi-row piles barrier on incident Rayleigh wave was investigated. Numerical simulation showed that this method can greatly reduce storage amount and computational one of conventional IBEM calculation. A typical example was given to discuss barrier effects of single row piles’ spacing, pile length, site wave velocity, row number of multi-row piles and spacing between rows on Rayleigh wave. The results showed that the row number of multi-row piles is the main factor affecting vibration isolation effect of multi-row piles, while the spacing between rows of multi-row piles has smaller effect on their vibration isolation effect; the spacing between piles and pile length are important parameters affecting vibration isolation effect of single-row piles; if the pile spacing is 0.1-0.3 times of the wavelength of Rayleigh wave and the pile length is larger than one wavelength, good vibration isolation effect can be obtained; for different sites, the softer the site soil, the better the vibration isolation effect of row piles; multi-row piles barrier is suitable for vibration isolation of low-frequency wave.
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Rayleigh-wave / fast multi-pole indirect boundary element method (FMM-IBEM) / multi-rows of pile barrier / vibration isolation

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LIU Zhong-xian1,3, Fu Zhan-yuan1，Miao Yu2, Wang Zhi-kun1, Li Chang-jun1. 3-D simulation for broadband scattering of Rayleigh wave by discontinuous barrier based on FMP-IBEM[J]. Journal of Vibration and Shock, 2019, 38(19): 89-97

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