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实验采用声发射设备对砂岩单轴受载破裂过程进行监测。实验结果表明:声发射事件率与绝对能量时间序列分析都可反映出砂岩具有压密、弹性、塑性、破裂4个阶段的岩石脆性破坏机制。通过对岩石破裂过程的事件率和绝对能量的皮尔逊积矩相关系数研究,显示岩石破裂时大破裂和小破裂是相互独立的。综合分析表明砂岩大破裂都出现在最大应力出现之后,且也是导致岩石破裂的主要因素。实验结果对由该类岩石破裂引起的矿山地质灾害的长期监测及预报具有指导意义。
The acoustic emission equipment was used to monitor the uniaxial loading and unloading of sandstone. The experimental results show that both acoustic emission event rate and absolute energy time series analysis can reflect the brittle failure mechanism of rock with four stages of compaction, elasticity, plasticity and fracture. By studying the correlation coefficient of Pearson’s moment of event rate and absolute energy of the rock rupture process, it shows that the rupture of the rock is independent of the rupture and the rupture. The comprehensive analysis shows that the big rupture of sandstone occurs after the maximum stress occurs, and is also the main factor leading to the rock rupture. The experimental results are instructive for the long-term monitoring and prediction of mine geological disasters caused by such rock failure.