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通过对湖北云应的盐岩和泥岩,以及江苏金坛盐岩的单轴、三轴蠕变试验结果的分析,研究了包括应力、围压等外在条件以及内部组成结构对盐岩蠕变特性的影响。发现盐岩无论在何种围压下,稳态蠕变率都随偏应力的增加而显著地增大;围压起到限制变形的作用,而随着围压增高,围压对稳态蠕变率的影响越来越小;晶粒越大和杂质含量越多,盐岩的蠕变属性越弱。盐岩的蠕变变形是应变硬化和回复效应等内部变形机制共同作用的结果,选用内应力作为内变量可用来描述这种内部微观结构的演化过程。对云应盐岩的多级加载蠕变试验数据进行拟合,确定了非线性蠕变本构方程中的参数,理论与试验结果的比较表明,两者吻合性较好。
By analyzing the uniaxial and triaxial creep tests of salt rocks and mudstones in Yunying, Hubei Province and the salt rock of Jintan in Jiangsu Province, the external conditions including stress and confining pressure as well as the creep of salt rock Effect of characteristics. It is found that the steady state creep rate increases with the increase of deviatoric stress under any confining pressure of salt rock. The confining pressure plays the role of limiting deformation. With the increase of confining pressure, The effect of the rate of change is getting smaller and smaller; the larger the grain size and the more the impurity content, the weaker the creep property of rock salt. The creep deformation of salt rock is the result of the interaction of internal deformation mechanisms such as strain hardening and recovery effect. The selection of internal stress as internal variable can be used to describe the evolution of this internal microstructure. The multi-stage loading creep test data of the rock salt in the cloud should be fitted to determine the parameters in the nonlinear creep constitutive equation. The comparison between the theoretical and experimental results shows that the agreement between them is good.