Co-operative research for developing reliable core-based methods for measuring in-situ stresses

合作研究开发可靠的基于岩心的地应力测量方法

基本信息

批准号：
04302052
负责人：
MATSUKI Koji
金额：
$ 1.92万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04302052/
关键词：
Stress Measurement Anelastic Strain Recovery Differential Strain Curve Analysis Differential Strain Analysis Deformation Rate Analysis Acoustic Emission Round Robin Kamaishi mine コア

项目摘要

Fundamental research as well as actual in-situ stress measurements have been carried out by eight researchers to enhance reliability of core-based methods for measuring in-situ stresses at great depth. In the stress measurements common rock cores were distributed to each investigator who has performed stress measurements according to each way. Two series of rock core, a granodiorite and a limestone, were extracted from 550m and 250m level from Kamaishi mine.The methods of stress measurement were Deformation Rate Analysis (DRA) for Dr.Fujii and Prof.Yamamoto, the combined method of Acoustic Emission (AE) and the DRA for Prof.Furuzumi and Dr.Seto and Differential Strain (Curve) Analysis (DSCA) for Mr.Oikawa and Prof.Sano. The members of Tohoku Univ., Prof.Matsuki and Dr.Kojima, performed all the core-based methods. Mr.Oikawa performed a midified DRA under hydrostatic pressure in addition to the conventional DSCA, and Dr.Sano measured the anisotropy of elastic wave velocity to apply it to stress measurement. The comparison among the results given by the researchers has not been completed, but some agreements as well as some disagreements have been found.As basic research work, Prof.Yamamoto has proposed the mechanism which describes how inelastic deformation occurs when uniaxial compressive stress reaches the normal in-situ stress by being based on the concept of stress homoginization in rock in the earth crust. Prof.Matsuki and Dr.Kojima also have proposed another mechanism which may explain the behavior of rock, on which all of the core-based methods are based by model experiments of a glass plate which contained a closed crack with two main wing cracks at the tips.

八名研究人员已经进行了基础研究以及实际的原位应力测量值，以提高基于核心的方法的可靠性，以实现深度测量原位应力。在应力测量中，将公共岩核分布给每个研究者，这些研究者按照每种方式进行了应力测量。从Kamaishi矿山中提取了两个系列岩石核心，一个花岗闪线和一个石灰石。（AE）以及furuzumi和seto博士的DRA和差异菌株（曲线）分析（DSCA）和萨诺教授。 Tohoku Univ，Matsuki教授和Kojima博士的成员执行了所有基于核心的方法。除常规DSCA外，远川先生在静水压力下进行了中型DRA，Sano博士测量了弹性波速度的各向异性，以将其应用于应力测量。研究人员给出的结果之间的比较尚未完成，但是已经找到了一些协议以及一些分歧。作为基础研究工作，Yamamoto教授提出了这种机制，该机制描述了当Unixaxial压缩应力达到时如何发生无弹性变形。正常的原位应力是基于地壳中岩石中应力均匀化的概念。 Matsuki教授和Kojima博士还提出了另一种机制，可以解释岩石的行为，所有基于核心的方法均基于玻璃板的模型实验，其中包含一个封闭的裂纹，该裂纹在该裂缝处，在该裂缝处有两个主翼裂纹。尖端。