流体饱和多孔介质黏弹性动力人工边界  

Viscus-spring dynamical artificial boundary for saturated porous media

作　　者：王国军[1] 赵成刚[1] 

机构地区：[1]北京交通大学土木工程学院岩土工程研究所,北京100044

出　　处：《世界地震工程》2007年第3期54-59,共6页World Earthquake Engineering

基　　金：北京自然基金资助项目(8052015)

摘　　要：基于Biot流体饱和多孔介质本构方程,采用平面波和远场散射波经验叠加来反映外行波传播,以经验参数反映人工边界外行波动的衰减和多角度透射特性。在人工边界处分别施加反映固相和液相介质传播效应的弹簧及阻尼来模拟人工边界以外的无限域介质对来自有限域的外行波的能量的吸收作用。从而形成一种流体饱和多孔介质的黏弹性动力人工边界。数值算例表明:边界的精度和稳定性高于现有的黏性边界、黏弹性人工边界及一阶透射边界。Based on the constitutive equations of saturated porous media, this paper adopts the superimposing of plane wave and scattered wave in far field to simulate the propagation of the outgoing waves, and applies experimental parameter to decay of outgoing waves and multi-transmitting characteristics. By applying springs and damp to the artificial boundary, the energy absorbing function of the infinite domain beyond the ABC is realized. Then the viscous-spring artificial boundary of saturated porous media is formed. Numerical examples indicate that the accuracy and good stability of the proposed viscous - spring artificial boundary are higher than that of existing viscous boundaries, viscous-spring boundaries, the first-order transmitting boundary.

关 键 词：流体饱和多孔介质 黏弹性动力人工边界 有限元法 

分 类 号：P315[天文地球—地震学]