岩石峰值应力前后声发射特性研究
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摘要
采用TAW-2000D微机控制电液伺服岩石三轴试验机和SDAES型数字声发射仪组成的动态测试系统,对云南大红山铜矿白云岩进行了单轴压缩条件下的声发射试验,研究岩石在峰值应力前后声发射特性。试验结果表明:加载早期就有声发射活动,岩样在试验接近峰值强度时单位时间内的应力增长速度减小、声发射事件率出现明显下降,即出现相对平静期,峰值强度后的声发射现象仍然明显。
This paper uses the TAW-2000 D computer to control the dynamic testing system consisting of servo triaxial testing machine and SDAES digital acoustic emission analyzer, conducts the acoustic emission test of the Yunnan Dahongshan copper mine dolomite under the uniaxial compression condition, and studies the acoustic emission characteristics of rock before and after reaching the peak stress. The results show that: there is acoustic emission activity in the early loading period, the per unit time stress growth rate of rock sample decreases when the test near peak intensity, acoustic emission rate decreases significantly, namely appears the relatively quiet period, and the acoustic emission phenomenon is still evident after the peak intensity.
This paper uses the TAW-2000 D computer to control the dynamic testing system consisting of servo triaxial testing machine and SDAES digital acoustic emission analyzer, conducts the acoustic emission test of the Yunnan Dahongshan copper mine dolomite under the uniaxial compression condition, and studies the acoustic emission characteristics of rock before and after reaching the peak stress. The results show that: there is acoustic emission activity in the early loading period, the per unit time stress growth rate of rock sample decreases when the test near peak intensity, acoustic emission rate decreases significantly, namely appears the relatively quiet period, and the acoustic emission phenomenon is still evident after the peak intensity.
引文
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[3]吴志勤.桥梁检测技术及其发展趋势简述[J].山西建筑,2007,33(13).
[4]陈喜强,王志强.桥梁结构声发射现场检测方法探讨[J].科技创新导报,2009(32).
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