基于孔隙介质中弹性波速理论的结构损伤识别与成像  

Structural damage identification and image based on theory of elastic wave velocity for porous medium

作　　者：郭少华[1] 郭原草[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410004

出　　处：《中南大学学报（自然科学版）》2013年第10期4208-4213,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50778179)

摘　　要：基于规范空间理论研究各向异性固体运动方程与含水介质质量守恒方程的准静态耦合问题,讨论几种不同各向异性性质的孔隙介质的弹性波传播规律,分析波场速度在结构损伤区域的变化规律,最后采用偏移技术对结构损伤进行成像,提出一个新的可压缩空隙弹性介质的本构方程,在此基础上得到一组完全解耦的各向异性含水孔隙介质的弹性波方程。研究结果表明:各向异性含水孔隙介质的弹性波速即取决于固体骨架的本征特性也受到流固耦合系数的影响。The static coupled issue of the anisotropic solid motion equation and the water saturated interstitial media conservation of mass equation were studied on the base of the normative space theory, and the elastic wave propagation theory of several different kinds of anisotropic spacing medium was discussed. The variation theory of the wave velocity in the damage region was analyzed, and the structural damage was imaged by the migration technology. A new compressed interstitial elastic media constitutive equation was presented. A group of anisotropic water saturated interstitial medium elastic wave equations were obtained. The results show that the anisotropic water saturated interstitial medium elastic wave velocity relies on the constitutive character of the solid skeleton, and it is also affected by the fluid-solid coefficient.

关 键 词：孔隙介质 各向异性 可压缩弹性模型 弹性波 偏移成像 

分 类 号：TG111.3[金属学及工艺—物理冶金]