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Fundamental Study for the Application of AE Measurement to Predict Microcracking in Rock

应用声发射测量预测岩石微裂纹的基础研究

基本信息

批准号：
59420037
负责人：
TERADA Makoto
金额：
$ 13.63万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1985
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-59420037/
关键词：
Application of AE Measurement Prediction of Microcracking Localization of Dilatancy AE震源決定

项目摘要

An experimental research has been carried out for the application of acoustic emission (AE) measurement to predict microcracking in rock.The localization of dilatancy during creep of Oshima granite under uniaxial compression was investigated by locating hypocenters of AE events. It was found that the mechanical behavior of Oshima granite was controlled by the localization of microcracks. During the loading up to the creep stress, the hypocenters of AE events were randomly distributed throughout the specimen. As soon as the creep began, abrupt migration and clustering of AE hypocenters into several near-surface zones were observed. AE events formed volumetric concentrations. This migration and clustering strongly suggested the rapid localized development of dilatancy at the beginning of the primary creep.By the end of the primary creep, AE events began to concentrate into one of these cluster, while the activity of others gradually decayed. In the most active cluster, clustering of AE events by itself gave rise to more AE events preceding faulting. The shape of this cluster was spheroidal with the long axis parallel to the loading axis. The development of localized dilatancy identified by hypocenter locations was also confirmed by the surface strain mapping.

对岩石微裂纹的声发射（AE）预测进行了实验研究，通过对AE事件震源的定位，研究了大岛花岗岩单轴压缩蠕变过程中微裂纹的局部化。结果表明，大岛花岗岩的力学行为受微裂纹局部化控制。在加载到蠕变应力期间，AE事件的震源随机分布在整个试样中。当蠕变开始，突然迁移和集群的AE震源成几个近地表区进行了观察。AE事件形成体积浓度。这种迁移和聚集强烈地表明，在初始蠕变开始时，AE事件的快速局部化发展，到初始蠕变结束时，AE事件开始集中到其中一个集群中，而其他集群的活动逐渐衰减。在最活跃的集群，集群的AE事件本身引起了更多的AE事件之前的断层。该簇的形状为长轴平行于加载轴的球形。由震源位置确定的局部不稳定性的发展也被表面应变图所证实。