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A research for earthquake source mechanics based on the contact theory

基于接触理论的震源力学研究

基本信息

批准号：
05640470
负责人：
YOSHIOKA Naoto
金额：
$ 0.83万
依托单位：
Yokohama City 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：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

This project aims to investigate the fault mechanics based on the contact theory that has been mainly developed in the field of tribology. The results obtained are summarized as follows :(1) Plastic deformation at asperity contacts was found to play a key role in the deformation of contacting surfaces. Hysteresis and permanent offset, which have been typically observed in experiments on rocks, appeared in a computer simulation when a plastic deformation model is incorporated. The results were published as two papers in J.Geophys.Res.(2) An indentation test were performed to investigate the rate-dependent properties of rock friction. The result showed that the rate of deformation of the sample was strongly dependent on the collision velocity of the indenter. This phenomenon was interpreted as an effect of local heating between the indenter and the sample, which may reduce the viscosity of the sample, The results were published in Geophys.Res.Lett.(3) A computer simulation was performed to investigate the physical meaning of Dc that appears as a parameter in the rate and state variable friction law. The results of the computer simulation agreed with the experimental observations done by others. Dc was found to be correlate to the real local area of asperity contacts.(4) I tried to communicate with the investigators in the field of tribology to discuss problems of friction, wear and other related issues. I introduced some works done in the rock mechanics to them, which was published as two papers in Tribologist. The English versions were also published in Japanese J.Tribology.

本课题主要研究基于摩擦学领域发展起来的接触理论的断层力学。主要研究结果如下：（1）微凸体接触处的塑性变形对接触表面的变形起着关键作用。在岩石实验中观察到的典型的滞后和永久偏移，在计算机模拟中出现时，塑性变形模型被纳入。研究结果作为两篇论文发表在《地球物理学研究》杂志上。(2)采用压入试验研究了岩石摩擦的率相关特性。结果表明，试样的变形速率强烈地依赖于压头的碰撞速度。这种现象被解释为压头和样品之间的局部加热效应，这可能会降低样品的粘度。(3)通过计算机模拟研究了速率和状态变量摩擦定律中Dc的物理意义。计算机模拟的结果与其他人所做的实验观察一致。发现Dc与微凸体接触的真实的局部面积相关。(4)我试图与摩擦学领域的研究人员交流，讨论摩擦，磨损和其他相关问题。介绍了我在岩石力学方面的一些工作，并在《摩擦学家》上发表了两篇论文。英文版也发表在日文J.Tribology上。