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利用RMT-150B岩石力学多功能系统和声发射监测系统,对不同应力路径下的盐岩破坏过程进行试验研究。在试验结果基础上,分析了盐岩常规单轴加载、分级加卸载和多级加载过程中的声发射时序特征和变形特征。试验表明:盐岩常规单轴加载变形表现明显的阶段性特征,声发射信号阶段性特征也比较明显;分级加卸载试验中,存在比较明显的记忆效应,在低应力水平有较明显的声发射Kaiser效应,而在70%峰值应力卸载再加载时,则出现Felicity效应;多级加载试验表明,在低应力水平稳压对盐岩造成的损伤不大,很少有新生裂纹;而在高应力水平稳压时,会有大量由新生微裂纹和裂纹扩展产生的声发射事件。
The RMT-150B rock mechanics multi-functional system and acoustic emission monitoring system are used to study the failure process of salt rock under different stress paths. Based on the experimental results, the acoustic emission timing and deformation characteristics of salt rock in conventional uniaxial loading, grading loading and unloading and multi-stage loading are analyzed. The experimental results show that the conventional uniaxial deformation of salt rock shows obvious stage characteristics and the phase characteristics of acoustic emission signals are obvious. In the stage of loading and unloading test, there is obvious memory effect and obvious acoustic emission at low stress level Kaiser effect, while the Felicity effect occurs when the 70% peak stress is unloaded and reloaded. The multistage loading test shows that the damage caused by salt pressure is not large at low stress level, and there are few new cracks. Under high stress Horizontal regulation, there will be a large number of new micro-cracks and crack propagation generated acoustic emission events.