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，以提高基于岩心的大深度地应力测量方法的可靠性。在应力测量中，共同的岩芯被分配给每个根据每种方式进行应力测量的调查员。从釜石矿的 550m 和 250m 水平中提取了两个系列的岩心：花岗闪长岩和石灰岩。应力测量方法是 Fujii 博士和 Yamamoto 教授的变形率分析（DRA），声发射的组合方法(AE) 和 Dr.Furuzumi 和 Dr.Seto 的 DRA，以及 Mr.Oikawa 和 Dr.Oikawa 的微分应变（曲线）分析 (DSCA)佐野教授。东北大学的成员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之外，Oikawa先生还进行了静水压下的中间化DRA，Sano博士测量了弹性波速度的各向异性，并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，但发现了一些一致和一些分歧。作为基础研究工作，山本教授提出了描述当单轴压应力达到正常地应力基于地壳岩石中应力均质化的概念。 Matsuki 教授和 Kojima 博士还提出了另一种可以解释岩石行为的机制，所有基于岩心的方法均基于玻璃板的模型实验，该玻璃板包含闭合裂纹，在裂纹处有两个主翼裂纹。尖端。