弹性地基中波阻板对入射Rayleigh波的远场被动隔振研究

针对被保护结构下埋置波阻板的远场被动隔振问题，采用频域弹性边界元法，推导得到了弹性地基中波阻板对入射Rayleigh波散射的边界元方程，在此基础上对波阻板的远场被动隔振效果进行了计算，并对影响波阻板隔振效果的因素进行了分析。研究结果表明:在地基一定深度设置波阻板能够有效降低波阻板上方及后方区域的地面振动；减小波阻板埋深以及增大波阻板厚度均能获得更好的隔振效果；而增加波阻板的剪切模量是提高波阻板被动隔振效果的最有效措施。

Passive vibration isolation effectiveness of wave impedance block under incident Rayleigh wave in elastic foundation

The vibration isolation by a wave impedance block (WIB)as passive barriers installed under the protected structure is studied numerically in this paper. The investigation is conducted with the aid of boundary element method in frequency domain, and the boundary element equations for the scattering of the incident Rayleigh waves by WIB are derived. Solving the equations,the isolation efficiency of WIB as passive barriers can be obtained. Moreover, effects of the relevant parameters on the isolation effectiveness by WIB are analyzed and discussed. The results show that the WIB can decrease ground vibrations effectively within zones up and behind the WIB. Further,both decreasing the embedded depth and increasing the thickness of WIB can increase the isolation effectiveness, and increasing the shear modulus of WIB is the most effective measure to obtain a higher isolation efficiency.