砂岩破裂失稳声发射特征及相关性分析

Study on Acoustic Emission Features and Correlations of Sandstone Fracture

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。

Acoustic emission equipment was used to monitor sandstone under uniaxial load and failure process. Experimental results showed that analysis of acoustic emission event rate and absolute energy time series both could reflect sandstone brittle failure mechanism with four stages of compaction, elastic, plastic and broken. Study on the event rate and absolute energy during rock failure process by Pearson product-moment correlation coefficient showed that large rupture and small crack were independent of each other. Comprehensive analysis indicated that the sandstone large rupture came after the maximum stress, as the main cause to rock failure. The experimental results had guiding significance for long-term monitoring and forecast of mine geological disaster caused by this kind of rock failure.