盐岩巴西劈裂破坏声发射时序特征

 利用RMT-150B 岩石力学多功能系统和声发射监测系统，对盐岩巴西劈裂破坏过程中的变形与强度特征和声发射特征进行试验研究。试验结果表明：盐岩巴西劈裂破坏在峰值前的变形特征也存在类似单轴抗压试验的压密阶段、弹性阶段、屈服阶段和破坏阶段；在压密和弹性阶段声发射事件较少，能量较小，进入塑性阶段后，声发射振铃计数迅速增加，能量增大；当荷载超过承载能力后，试件突然劈裂破坏，残余应力迅速消失。试验表明，可通过观察振铃计数、累计计数和能量判定试件破坏的前兆，为工程实践提供借鉴和参考。

Acoustic Emission Timing Features of Salt Rock Under Brazilian Splitting

Brazilian split tests for salt rock were carried out with a servo-controlled test machine RMT-150B, and acoustic emission (AE) detections were conducted at the same time. The results indicate that the deformation characteristics before the peak load in Brazilian split tests are similar to those of uniaxial compression test which could be divided into four stages, namely compression, elasticity, yielding and failure stage. AE events in compression and elasticity stage are totally low in energy and accumulation number. Starting from the yield stage, AE events increase rapidly, and energy and accumulation number grow quickly. The specimens suddenly fracture when the load exceeds capacity, and the residual stress rapidly disappears. In this test, the sign for specimen failure could be judged through observing ringing counting, accumulation number and energy, so as to provide reference for engineering practice.