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《Journal of Vibration and Shock》 2015-16
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Isolation of fast longitudinal waves by barriers composed of several rows of cylindrical cavities in saturated soils

XU Ping;TIE Ying;CHEN Bin;School of Water and Environment,Zhengzhou University;School of Mechanical Engineering,Zhengzhou University;Ningbo Urban Rail Transit Project Construction Headquarters;  
The lengths of cylindrical cavities were considered as much larger than their diameters,so the isolation of incident plane P1waves( fast compressive wave) by discontinuous barriers composed of several rows of cylindrical cavities was simplified as a two-dimensional plane problem. The conformal mapping method of complex functions and expansion method of wave functions were adopted,the cylindrical cavities were considered to be of free boundaries,where no stresses exist,and then the theoretical solutions about the complex coefficients of scattering wave potential functions were obtained. By studying the normalized displacement amplitudes,which are expressed as the ratios of displacement amplitudes of soils behind the barriers caused by both the incident and scattering waves to those only by the incident P1 waves,the isolation effects of the barriers composed of one,two and three rows of cylindrical cavities were compared. The results reveal that the isolation effects of barriers composed of several waterproof cylindrical cavities are better than those composed of permeable cylindrical cavities; the isolation effects of barriers composed of several rows of cylindrical cavities on incident P1 waves with higher frequencies are much better than on those with lower frequencies; with the increasing of row number of cylindrical cavities,the vibration isolation effects is obviously improved,and the effective isolation area is obviously increased; as the row number of cylindrical cavities reaches three,the isolation effects at some locations behind the barriers are much better and almost increase to 70%.
【Fund】: 国家自然科学基金项目(51008286 51278467);; 河南省高校科技创新人才支持计划(14HASTIT050)
【CateGory Index】: TU43
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