A Study on Dynamics of Seismic Source or Crack

震源或裂缝动力学研究

• 批准号: 60550321
• 负责人: HIROSE Sohichi
• 金额: $ 1.15万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550321/
• 关键词: Fracture; Crack; Seismic Source; Boundary Integral Equation; Acoustic Emission; Elastic wave; 散乱

In this project, dynamic characteristics of seismic fault or crack were investigated theoretically and experimentally. In theoretical studies, the boundary integral equation method was used, while in experimental studies, the monitoring system of acoustic emissions were employed. This project is mainly divided into two parts. One is concerned with the scattering of elastic waves by seismic fault or crack. The other is the dynamic fracture problems of seismic source or crack.1. Scattering problems of elastic waves: The scattering problems of elastic waves by a crack were theoretically solved by means of the boundary integral equation, which were derived from both the Green's displacement formula and the Green's traction formula. Numerical analyses were carried out for incident body waves and surface waves with a variety of frequency and various geometrical parameters of seismic sources and cracks. The experiments on elastic wave propagation were carried out and compared with the above theoretical results.2. Dynamic fracture problems: As before, theoretical studies on dynamic fracture problems were made by use of the boundary integral equation method. These problems were formulated as moving boundary problems and solved numerically. From fracture experiments of PMMA plates, furthermore, dynamic parameters of AE sources were determined on the basis of the dislocation theory.

本课题从理论和实验两个方面对地震断层或裂隙的动力特性进行了研究。理论研究采用边界积分方程法，实验研究采用声发射监测系统。本项目主要分为两个部分。一种是关于地震断层或裂缝对弹性波的散射。二是震源或裂纹的动态断裂问题.弹性波的散射问题：利用由绿色位移公式和绿色拉力公式导出的边界积分方程，从理论上求解了裂纹对弹性波的散射问题。对不同频率、不同震源和裂隙几何参数的入射体波和面波进行了数值分析。进行了弹性波传播实验，并与上述理论结果进行了比较。动态断裂问题：如前所述，动态断裂问题的理论研究采用边界积分方程法。这些问题被制定为移动边界问题和数值求解。在此基础上，通过PMMA板的断裂实验，根据位错理论确定了声发射源的动力学参数。

项目成果

廣瀬壮一: 境界要素法論文集. 2. 125-130 (1985)

广濑宗一：边界元法论文集 2. 125-130 (1985)。

Sohichi Hirose: "Scattering of elastic waves by a crack in a half space (in Japanese)" Proc. 2nd Japan National Symposium on Boundary Element Methods. 2. 125-130 (1985)

Sohichi Hirose：“半空间裂缝的弹性波散射（日语）”Proc。

Sohichi Hirose: "Scattering of elastic waves by cracks in a half space"

广濑宗一：“弹性波通过半空间裂缝散射”