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| 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 |
1. Tianjin Municipal Key Lab of Civil Buildings Protection and Reinforcement, Tianjin Chengjian University, Tianjin 300384, China;
2. School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China;
3. Tianjin Municipal Research Institute of Earthquake Engineering, Tianjin 300384, China |
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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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Received: 12 February 2018
Published: 28 September 2019
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