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针对盐岩作为储库介质在长期运营下的变形行为,开展了历时359 d的层状盐岩室内单轴蠕变试验,实时监测了试验过程中的声发射信号规律。研究表明,盐岩单轴蠕变试验中声发射表现出特征明显不同的3个阶段,累计声发射事件定位显示,各阶段声发射信号的分布与试件的变形及破坏位置基本一致,并且累计声发射事件数与蠕变应变近似满足线性关系,验证了基于声发射事件数来建立盐岩蠕变本构模型的合理性。进一步构建了基于声发射的盐岩损伤演化本构模型,并采用最小二乘法拟合本试验数据获得本构模型中的参数,由拟合曲线可知,基于声发射的盐岩蠕变本构模型能够较好地描述盐岩蠕变的3个特征阶段。
According to the deformation behavior of rock salt as reservoir medium under long-term operation, a uniaxial creep test of stratiform salt rock lasted 359 days, and the law of acoustic emission signal was monitored in real time. The results show that the acoustic emission in salt rock uniaxial creep test shows three distinct phases with different characteristics. The location of accumulated acoustic emission events shows that the distribution of acoustic emission signals in each stage is basically in accordance with the deformation and failure locations of the specimens, The number of acoustic emission events and creep strain approximately satisfy the linear relationship, which verifies the rationality of establishing the creep constitutive model of rock salt based on the number of acoustic emission events. The damage evolution constitutive model of salt rock based on acoustic emission is further constructed and the parameters of the constitutive model are obtained by fitting the experimental data by the least squares method. From the fitted curve, it can be seen that the creep constitutive model of rock salt based on acoustic emission It can describe the three characteristic stages of salt rock creep better.