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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.

八名研究人员进行了基础研究和实际地应力测量，以提高基于岩心的方法在大深度测量地应力的可靠性。在应力测量中，将普通岩心分发给按照每种方式进行应力测量的每个研究者。从釜石矿550 m和250 m水平提取了两个系列的岩芯，一个花岗闪长岩和一个石灰岩。应力测量的方法是藤井博士和山本教授的变形速率分析法（DESIGN RATE ANALYSIS），古泉教授和濑户博士的声发射（AE）和DESIGN联合法，以及Oikawa先生和Sano教授的微分应变（曲线）分析法（DSCA）。东北大学的成员们，松木教授和小岛博士执行了所有基于核心的方法。除了传统的DSCA外，Oikawa先生还在静水压力下进行了一次改良的地震，佐野博士测量了弹性波速度的各向异性，将其应用于应力测量。研究者们给出的结果之间的比较还没有完成，但也发现了一些一致的地方，也发现了一些不一致的地方。作为基础研究工作，山本教授根据地壳岩石中应力均匀化的概念，提出了描述单轴压应力达到正常地应力时发生非弹性变形的机制。Matsuki教授和Kojima博士还提出了另一种可能解释岩石行为的机制，所有基于岩心的方法都是基于玻璃板的模型实验，该玻璃板包含一个闭合裂纹，尖端有两个主翼裂纹。