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

• 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

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.

已经进行了一项实验研究，以应用声发射（AE）测量以预测岩石中的微裂纹。发现奥岛花岗岩的机械行为是通过微裂纹的定位控制的。在加载到蠕变应力期间，AE事件的降压体在整个样品中随机分布。一旦蠕变开始，就会观察到AE低中心者突然迁移和聚集到几个近乎表面的区域。 AE事件形成体积浓度。这种迁移和聚类强烈表明，在初级蠕变开始时，膨胀的局部局部迅速发展。为了在主要蠕变的末端，AE事件开始集中在其中一个集群中，而其他人的活性逐渐衰减。在最活跃的群集中，AE事件的聚类本身引起了故障之前的更多AE事件。该簇的形状是球形的，长轴平行于载荷轴。表面应变映射也证实了通过低中心位置确定的局部膨胀率的发展。

项目成果

Journal of the Society of Material Science. 35 - 392. (1986)

材料科学学会杂志。

土木学会論文集. 400/【III】-1. (1986)

日本土木工程师学会论文集 400/[III]-1 (1986)。

材料. 35-392. (1986)

材料。35-392。

Journal of Geophysical Research. 90 - B8. (1985)

地球物理研究杂志。

Jishin. 38 - 2. (1985)

吉辛。