含夹层盐岩蠕变特性试验及其本构关系

为了解某拟建盐穴储库围岩含夹层盐岩的蠕变特性，对该库址含泥岩夹层盐岩、纯泥岩和纯盐岩3种岩芯试样进行了不同围压下三轴压缩蠕变试验，分析了其蠕变变形规律。实验结果表明：含夹层盐岩初始蠕变阶段的持续时间大于泥岩试件而与盐岩试件基本相同，即第1蠕变阶段的持续时间主要由层状盐岩试件中盐岩体部分决定；第2蠕变阶段的稳定蠕变速率则随着泥质夹层含量的不同呈现较大的差异，在相同应力条件下，含泥质夹层盐岩试件的蠕变速率小于盐岩而大于泥岩。根据3种岩样第2蠕变阶段的蠕变特性，基于含泥质夹层盐岩试件中泥质夹层的体积分数，推导了含夹层盐岩蠕变力学参数与纯盐岩及纯泥岩蠕变参数的关系。

Creep property experiment and constitutive relation of salt-mudstone interlayer

In order to understand the mechanical characteristics of the surrounding layered rock salt of a gas storage cavern in Jiangsu Province,creep experimental studies of triaxial compression under different confining pressures were carried out on three kinds of rock samples which were rock salt,mudstone and salt-mudstone interlayer.The experiments indicate that the duration of the first creep stage of salt-mudstone interlayer is larger than that of mudstone and almost the same as that of rack salt.The duration o...