(1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical
and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；3. Shenyuan Geotechnical Engineering Co.，Ltd.，Shanghai Modern Architectural Design Group，Shanghai 200040，China；
4. B.M. Holding(Group) Co.，Ltd.，Shanghai 200070，China)
Abstract：Wave barrier has been widely employed in engineering as an effective way to harness vibration pollution. Studies on vibration isolation using barrier are mainly based on elastic half-space soil at present，and little attention is paid to the vibration isolation in layered foundation in accordance with reality. The semi- analytical boundary element method(BEM) with the basic solution of thin layered method(TLM) using orthogonal coordinates and the second shape function was employed to investigate the isolation effect of passive wave barriers in layered foundation. The numerical results indicate that：(1) Based on the numerical study of a upper-soft lower-hard foundation，the normalized depth of piles in row as passive vibration isolation is about 2.5 for providing satisfying vibration isolation effect，which is greater than that in homogeneous ground(1.0)；(2) The normalized depth of piles in row is about 2.0 for a upper-hard lower-soft foundation；(3) If the ratio of shear modulus of pile to that of topsoil，G* meets the requirement of 5≤G*≤30，the vibration isolation effect obviously increases with G*.
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2013, Vol. 32 
