层状盐岩蠕变变形相互作用研究

考虑泥岩夹层和盐岩的弹性性质和稳态蠕变性质，通过数值试验方法计算层状复合盐岩体在单轴和低围压三轴荷载作用下蠕变变形过程中力学相互作用和变形时效规律，分析泥岩夹层和盐岩层因蠕变率不匹配对层状盐岩蠕变的影响，初步讨论了层状复合岩体的复合材料研究方法。结果表明，层状盐岩中泥岩夹层与盐岩因弹性参数不匹配产生的初始应力集中在蠕变过程中发生松弛，因泥岩夹层与盐岩层蠕变率不匹配导致两者之间应力重分布，泥岩夹层对盐岩层的蠕变有明显抑制作用。这些分析体现了层状盐岩蠕变过程的非线性性质，为建立层状盐岩体合理本构模型奠定了基础。

Study of interaction between creep deformation of bedded salt rock

Considering elasticity and steady-state creep of mudstone and salt rock, numerical experiment approaches are employed to study mechanics and time-dependent law of bedded salt rock under uniaxial and low confining pressure triaxial loadings; the effect of creep rate mismatch between salt rock and mudstone on the creep of bedded salt rock is analyzed. Finally, composite material research methods of laminated composite are preliminary discussed. It is shown that the initial concentrated stresses induced by elastic parameters mismatch are relaxed in the process of creep; stress redistribution induced by creep rate mismatch between salt rock and mudstone is exhibited; interlayer(mudstone) with relatively small steady creep rate obviously influences the creep of bedded salt rock. These analyses reflect the nonlinear creep behavior of bedded salt rock, so as to lay the basis for establishing constitutive law in the future.