Scattering of elastic waves by mountain cracks in elastic half space

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (19) : 195-203.

SUN Xiaojian1, LIU Zhongxian1,2, ZHANG Hai1

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Abstract

The indirect boundary element method (IBEM) was used to solve scattering of elastic waves by mountain cracks in elastic half space. Taking a semi-circular mountain with cracks as an example, effects of incident wave frequency, crack angle, crack location and crack number on plane elastic wave scattering were analyzed, anddisplacementamplitudes of the mountain surfaceand the surface on both sides were calculated. Results showed thatcracks have obviousscaling effect on mountain surface displacement; with increase in frequency, effects of crack angle decrease, while effects of crack number increase gradually; when P wave is vertically incident, the amplification effect is the most obvious at the mountainside; compared with the mountain without crack, the peak value of horizontal displacement at the mountainside in the frequency range of 3 to 5 is about 2 times largerthan that in case of the mountain without crack; when SV wave is vertically incident, change at the mountain foot is the most obvious, the maximum peak value reaches 1.8, nearly 27% higher than that in case of the mountain without crack.

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indirect boundary element method (IBEM) / mountaincracks / elastic waves

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SUN Xiaojian1, LIU Zhongxian1,2, ZHANG Hai1. Scattering of elastic waves by mountain cracks in elastic half space[J]. Journal of Vibration and Shock, 2020, 39(19): 195-203

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