【摘要】 在饱和地基动力反应的有限元分析中,需要对有限大小网格的边界条件进行处理,以反映实际地基在空间上的无限性。根据Biot动力固结理论,提出了一种适用于两相体时域动力分析的粘弹性边界条件。数值分析结果显示,该边界可较好地模拟远场介质的作用以及土体的辐射阻尼,具有良好的低频稳定性。还讨论了其精度及适用范围。更多还原

【Abstract】 In order to simulate the infinite domain,a special boundary condition should be used in the dynamic analysis of saturated soil foundation with the finite element method.Based on the Biot’s consolidation theory,a visco-elastic transmitting boundary was proposed,which could be used in dynamic analysis of saturated porous media in the time domain.Numerical results showed that the proposed boundary could simulate the influence of far field and did not have the problem of low-frequency instability.The efficiency and applicability of the proposed transmitting boundary were also discussed.更多还原