基于声发射特征的盐岩蠕变本构模型研究

发布时间：2018-02-14 17:44

本文关键词： 蠕变声发射损伤分数阶微分单轴压缩　出处：《岩土力学》2017年07期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Aiming at the deformation behavior of salt rock as reservoir medium under long-term operation, a 359-day indoor uniaxial creep test of layered salt rock was carried out, and the rules of acoustic emission signals during the test were monitored in real time. In the uniaxial creep test of salt rock, acoustic emission (AE) shows three stages with distinct characteristics. The accumulative AE event location shows that the distribution of AE signal in each stage is basically consistent with the deformation and failure location of the specimen. The cumulative number of AE events is approximately linear with the creep strain, which verifies the rationality of establishing the creep constitutive model of salt rock based on the number of AE events. Furthermore, the damage evolution constitutive model of salt rock based on AE is constructed. The parameters of the constitutive model are obtained by using the least square method to fit the experimental data. The fitting curve shows that the constitutive model of salt rock creep based on acoustic emission can better describe the three characteristic stages of salt rock creep.
【作者单位】：中国矿业大学(北京)煤炭资源与安全开采国家重点试验室;
【基金】：国家自然科学基金(No.11172318,No.51120145001)~~
【分类号】：TU45

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