饱和多孔弹性材料中加速度波的传播  

Acceleration Waves in Saturated Poroelastic Materials

作　　者：刘占芳[1,2] 严波[1,2] 唐录成 

机构地区：[1]重庆大学工程力学系 [2]中国工程物理研究院

出　　处：《重庆大学学报（自然科学版）》1998年第2期7-15,共9页Journal of Chongqing University

基　　金：国家自然科学基金;亚历山大.冯.洪堡基金会(AvH)资助项目

摘　　要：讨论多孔介质中加速度波的传播问题。采用Ｂｏｗｅｎ的模型描述由线弹性可压缩固体骨架和可压缩流体组成的饱和多孔介质，并且本文将孔隙度的演化修正为与固体和流体速度的散度相关联。然后用改进的控制场方程研究两相多孔介质中加速度波的传播，结果表明在该种介质中存在两种加速度波。最后考察了均匀弱间断情况下加速度波的波幅演化规律。In this work the propagation of acceleration wave in porous media is investigated. The basic formulation of Bowens model is adopted to describe the saturated porous media composed of a linear elastic compressible skeleton and a compressible fluid. In particular, the porosity change is modified to associate with divergence of velocities of the solid and the fluid rather than the divergence of displacements as Bowens model. The modified governing field equations are then used to study the propagation condition of acceleraion wave in two-component porous materials. It is shown that two types of acceleration waves are realizable in the media. Finally, in the context of homogeneous weak discontinuity, the evolution of the amplitudes of acceleration wave is analyzed.

关 键 词：多孔介质 加速度波 孔隙度 弹性材料 

分 类 号：O347.4[理学—固体力学]