用声发射技术研究圆形开口周围的损伤区

IF 1.1 Q3 MINING & MINERAL PROCESSING
A. Dadi-givshad, M. Ahmadi, H. Nejati
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引用次数: 1

摘要

声发射法是研究岩石结构损伤区的一种方法。该方法基于接收地下开挖周围岩体变形和开裂产生的弹性波。本研究采用数值方法对岩石样本进行了研究,以研究其上圆形空间开挖引起的破坏区。为此,制备了33个不同材料类型的立方体样本,包括砂岩、混凝土和水泥砂浆。在每个样品的中心钻一个圆孔。孔径为20或25mm。样品以不同的应力率单轴或双轴加载。试图研究测试过程中样品中发生的声学事件,并对其位置进行调查。然后,利用FLAC3D软件和一些开发的代码,用数值方法对实验进行了评估。研究了加载期间发生声学事件的样品损伤区与达到一定程度的拉伸和剪切屈服的数值单元之间的关系。结果表明,水泥砂浆试件的声学参数累积量大于其他试件。事实上,晶粒越细,产生的能量和计数就越多。此外,结果表明,随着侧向压力和加载速率的增加,累积能量和计数都会减少。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of Damaged Zone around Circular Opening Using Acoustic Emission Technique
One of the methods used to investigate the damaged zone in rock structure is the acoustic emission method. This method is based on receiving the elastic waves that are produced by deformation and cracking of the rock mass around the underground excavation. In this research, a study is conducted on the rock samples by a numerical method to investigate the damaged zone caused by the excavation of circular space on it. For this purpose, 33 cube samples of three different material types including sandstone, concrete, and cement-plaster mortar are prepared. A circular hole is drilled in the center of each sample. The hole diameter is 20 or 25 mm. The samples are loaded uniaxially or biaxially with different stress rates. It is tried to study the acoustic events occurring in the samples during the test, and their locations are investigated. Then the experiments are evaluated by a numerical method using the FLAC3D software and some developed codes. The relation between the sample damaged zone where the acoustic events have occurred during the loading period and the numerical elements that reach a degree of tensile and shear yield is studied. The results obtained show that the amount of cumulative acoustic parameters in cement-plaster mortar specimens is more than the others. In fact, the finer grains, the more amounts of energy and counts will be produced. Also, the results show that with increase in the lateral pressure and loading rate, the amount of cumulative energy and counts decreases.
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来源期刊
Journal of Mining and Environment
Journal of Mining and Environment MINING & MINERAL PROCESSING-
CiteScore
1.90
自引率
25.00%
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