The analysis of the differences of acoustic emission during loading process based on the influence of bedding
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摘要: 为了探究层理对煤矿开采过程中煤岩声发射特征的影响，在寺河矿采集煤样，根据煤样制作要求，分别沿轴向垂直层理方向和平行层理方向加工煤样。利用RMT-150B岩石力学实验系统和CDAE-1全数字化声发射检测及分析系统，对煤样加载过程中的应力-应变、声发射特征进行测试分析。测试结果显示：轴向垂直层理煤样不仅具有较高的岩石力学强度和声发射强度，而且声发射特征具有较强的突变性和滞后性。声发射特征的差异性体现了在加载过程中，轴向垂直层理煤样以整体变形、破坏为主，轴向平行层理煤样以局部变形、破坏为主，这为煤矿井下动力灾害的监测、预报提供了指导。Abstract: In order to explore the effect of bedding on characteristics of acoustic emission during coal mining, the coal samples were collected in Sihe coal mine. The coal samples were made along the axial direction of the vertical stratification and parallel bedding direction, according to the requirements of making the coal samples. With RMT-150B rock mechanics test system and CDAE-1 all-digital acoustic emission detection and analysis system, the samples were tested for stress-strain-acoustic emission during loading. The test results showed that the coal samples of axial vertical stratification had high rock mechanics strength and acoustic emission intensity. The acoustic emission features were strong respectively and hysteresis quality. The difference of acoustic emission characteristics in the loading process reflected that the axial vertical stratification of coal samples were given priority to the overall deformation and destruction. The axial parallel bedding coal samples were given priority to local deformation and destruction. This provides guidance for monitoring and forecasting of coal mine dynamic disaster.
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Keywords:
- rock mechanics /
- bedding /
- acoustic emission /
- experiment
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