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Mechanical properties and damage constitutive model for uniaxial compression of salt rock at different loading rates
International Journal of Damage Mechanics ( IF 4.2 ) Pub Date : 2021-01-14 , DOI: 10.1177/1056789520983868
Junbao Wang 1, 2 , Qiang Zhang 1, 2 , Zhanping Song 1, 2 , Yuwei Zhang 1, 2 , Xinrong Liu 3
Affiliation  

To study the effect of loading rate on the mechanical properties of salt rock, uniaxial compression tests and acoustic emission tests at different loading rates were carried out on salt rock specimens. The test results show that with increases in loading rate, the peak stress of salt rock increases first and then essentially remains unchanged, and the elastic modulus increases gradually, while the strain at peak stress decreases gradually. Moreover, the Poisson’s ratio is independent of loading rate. The macroscopic failure modes of the salt rock specimens at different loading rates are all ‘X’-type conjugate shear failure. However, the loading rate is closely related to the degree of fracture, such that the smaller the loading rate is, the higher is the degree of fracture of salt rock. In order to describe the stress–strain behaviour in the process of salt rock failure, a damage variable expression represented by the deformation modulus was proposed, and a rock damage constitutive model was established according to the theory of continuum damage mechanics. The rationality of the damage constitutive model was verified by using the present uniaxial compression test results of salt rock and existing test data from the literature. The results show that the model can accurately describe the stress–strain response of rock in the failure process.



中文翻译:

不同加载速率下盐岩单轴压缩的力学特性和损伤本构模型

为了研究加载速率对盐岩力学性能的影响,对盐岩标本进行了不同加载速率下的单轴压缩试验和声发射试验。试验结果表明,随着荷载率的增加,盐岩的峰值应力先增大,然后基本保持不变,弹性模量逐渐增大,而峰值应力处的应变逐渐减小。此外,泊松比与加载速率无关。盐岩试样在不同加载速率下的宏观破坏模式均为“ X”型共轭剪切破坏。但是,加载速率与断裂程度密切相关,因此加载速率越小,盐岩的断裂程度越高。为了描述盐岩破坏过程中的应力-应变行为,提出了以变形模量表示的破坏变量表达式,并根据连续破坏力学理论建立了岩石破坏本构模型。利用目前盐岩的单轴压缩试验结果和文献中已有的试验数据,验证了损伤本构模型的合理性。结果表明,该模型可以准确地描述岩石在破坏过程中的应力应变响应。利用目前盐岩的单轴压缩试验结果和文献中已有的试验数据,验证了损伤本构模型的合理性。结果表明,该模型可以准确地描述岩石在破坏过程中的应力应变响应。利用目前盐岩的单轴压缩试验结果和文献中已有的试验数据,验证了损伤本构模型的合理性。结果表明,该模型可以准确地描述岩石在破坏过程中的应力应变响应。

更新日期:2021-01-16
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