粘弹性层状半空间中瑞雷波多模式耦合及传播特性研究

项目名称： 粘弹性层状半空间中瑞雷波多模式耦合及传播特性研究

项目编号： No.41204042

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 地球物理学和空间物理学

项目作者： 刘雪峰

作者单位： 哈尔滨工业大学

项目金额： 25万元

中文摘要： 近年来关于弹性层状介质中瑞雷波传播特性的研究越来越多，而关于粘弹性层状介质中瑞雷波传播特性的研究仍然很少。由于岩石、土壤等很多介质都有一定的粘弹性，因此研究粘弹性层状介质中瑞雷波的传播特性有重要的意义。传统上往往将对应于同一条频散曲线的瑞雷波定义为同一模式，而实际上在弹性层状介质中可以将频散曲线按相速度分区，根据分区对瑞雷波频散曲线分段定义其对应的模式。前期研究表明这种新的模式定义比传统的定义具有更明显的物理意义。本项目将这种新的模式定义推广到粘弹性层状介质中，基于这种定义研究粘弹性层状介质中瑞雷波多模式的耦合现象，并且研究不同模式瑞雷波在粘弹性层状介质中的传播特性。本项目的研究对深入了解粘弹性层状介质中瑞雷波的频散机理有重要意义，而且对瑞雷波的实际应用有指导意义。

中文关键词： 瑞雷波；层状介质；粘弹性；多模式；

英文摘要： In recent years, there are more and more studies about the propagation characteristics of Rayleigh waves in elastic stratified half-space. However, there are few studies about the propagation characteristics of Rayleigh waves in viscoelastic stratified half-space. Since many media such as rock and soil are viscoelastic, it is very meaningful to study the propagation characteristics of Rayleigh waves in viscoelastic stratified half-space. Traditionally, the Rayleigh waves correspond to one dispersion curve are defined as one mode. Actually, the dispersion curves can be divided into several velocity zones. Then a dispersion curve can be divided in to several sections, and the Rayleigh waves correspond to one section can be defined as one mode. The former study showed that the new definition of modes is physically more meaningful than the traditional one. In this project, the new definition of modes is introduced into the case of viscoelastic stratified half-space. Based on the new definition, the coupling phenomenon of modes is analyzed, and the propagation characteristics of Rayleigh waves of different modes in viscoelastic stratified half-space are studied. The study of this project is meaningful for further understanding the dispersion mechanism of Rayleigh waves in viscoelastic stratified half-space. It is als

英文关键词： Rayleigh wave；stratified medium；viscoelastic；multi-modes；