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Micromechanics in frictional dynamics of faults

断层摩擦动力学的微观力学

基本信息

批准号：
02452056
负责人：
YOSHIOKA Naoto
金额：
$ 3.97万
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 (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02452056/
关键词：
rock friction contact theory plastic deformation surface topography fault earthquake source mechanism transmission waves

项目摘要

This project has been carried out to investigate the contact mechanics between two rough surfaces.First of all,measurement method of surface topography was examined by use of a three dimensional surface profilometer. A new data acquisition method was proposed. Paper 1( see below ) has been submitted in which the results are included. We also performed a computer simulation using the three dimensional surface data acquired by the method mentioned above. We found that plastic behavior of contacting asperities plays an important role and hysteresis in loading and unloading processes can be explained by the plastic behavior. The results were reported in Paper 1.A series of experiments have been conducted to investigate wave transmission across a contacting surface. Comparing the experimental results with the theory of wave transmission, we found that a joint behaves visco-elastically to high frequency transmission P- and S-waves. The results have been presented in the Paper 2( see below ).As to the initiation of slip, two papers have been published which are shown on the other side of this report. The mechanics of initiation of slip were precisely studied and the experimental results were compared with a contact theory. The theory successfully explains the experimental results. Thus we can understand the mechanics of initiation of slip more precisely than previously done.All the results obtained in this project were reported in a separate volume.Paper 1 N.Yoshioka, Elastic and plastic behavior of contacting surfaces under normal load: A computer simulation using three dimensional surface topographies, submitted to J. Geophys. Res.Paper 2 N.Yoshioka and M.Kikuchi, Visco-elastic response of joints to transmission waves, submitted to Geophys. Res. Lett.

本研究针对粗糙表面间的接触力学进行研究，首先，探讨利用三维表面轮廓仪量测表面形貌的方法。提出了一种新的数据采集方法。已提交文件1（见下文），其中包括结果。我们还进行了计算机模拟使用的三维表面数据所获得的上述方法。研究发现，接触微凸体的塑性行为起着重要的作用，加载和卸载过程中的滞后现象可以用接触微凸体的塑性行为解释。论文1给出了实验结果。通过一系列实验研究了波在接触面上的传播。将实验结果与波传播理论进行比较，发现节理对高频传播的P波和S波表现为粘弹性行为。结果已在论文2中介绍（见下文）。关于滑移的起始，已发表了两篇论文，见本报告的另一侧。精确地研究了滑移开始的机理，并将实验结果与接触理论进行了比较。该理论成功地解释了实验结果。因此，我们可以比以前更精确地理解滑移开始的机理。在这个项目中获得的所有结果都在一个单独的卷中报道。论文1 N.Yoshioka，法向载荷下接触表面的弹性和塑性行为：使用三维表面形貌的计算机模拟，提交给J. Geophys。研究论文2 N.Yoshioka和M.菊池，节理对透射波的粘弹性响应，提交给地球物理学。保留信函