饱和孔隙介质中波动分析的加权吸收边界条件

饱和孔隙介质中波动分析的加权吸收边界条件 English Version

Geotechnical Engineering Institute Chongqing Architectural University Chongqing 630045

摘要: 提出一种应用于孔隙介质稳态波动分析平面有限元模型的人工边界处理的新方法———加权平均逼近法。采用边界点入射波与反射波的能量比和有效能量比作为评价标准，数值分析结果表明，利用本文方法建立的局部吸收边界对Ｐ１波和Ｐ２波有良好的吸收能力
- 孔隙介质 /
- 稳态波动 /
- 加权吸收边界
Abstract: An absorbing boundary condition is generally needed to model wave propagation in an unbounded domain in FEM analysis. Considering that the absorbing capabilities for the incident waves with large obliquity is commonly poor, a weighted absorbing boundary condition is presented and the computational formulae are derived based on the Fourier tranformation solution of wave propagation equations in poroelastic media. Its efficiency is compared with the results of G. Degrande and G. De Roeck in a numerial example by a study of the reflected wave amplitudes for waves—P1, P2 and SV at various angles of incidence. The results have shown that the weighted absorbing boundary is an improvement on the absorbing capabilities especially for P1 and P2 waves.
- poroelastic media /
- steady wave propagation /
- weighted absorbing boundary condition.