单轴载荷作用下岩石损伤演化及声发射特性研究

Research on rock damage evolution and acoustic emission characteristics underuniaxial loading

本文通过对两种不同岩石试样进行了单轴载荷破坏过程中声发射特性试验,得到了岩石全应力应变破坏过程中,声发射事件时间序列、事件累计数时间序列等声发射特性,分析了岩样损伤破裂不同阶段与声发射参数的内在联系与特征规律,研究表明,声发射信息反映岩石内部的损伤破坏情况,与其内部原生裂隙的压密及新裂隙的产生、扩展、贯通等演化过程密切相关,通过声发射事件数参数拟合出的理论应力应变曲线能够合理地反映岩石实际的应力应变和损伤演化特性,对预测预报岩石破坏失效的过程具有有着极其重要的理论价值和实际意义。

This paper obtains the acoustic emission characteristics such as time sequence of acoustic emission events, time series of accumulative event number and etc. during the process of rock damage under full stress -train through research on acoustic emission characteristics of two kinds of different rock specimens during the damage process under uniaxial loading, and analyzes the internal relations and characteristic laws between rock damage fractures in different stages and acoustic emission parameters. The research shows that the acous- tic emission information reflects that the internal fracture damage condition of the rock is closely related to the densification of its internal initial fissure and the evolution process of new fissures such as generation, exten- ding, connection and etc. The fitting theoretical stress -strain curve can reasonably reflect the actual stress and strain and damage evolution features of the rock through the acoustic emission event parameters, which has extremely important theoretical value and practical significance to the prediction of the process of rock damage anti failure.