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中文摘要：
以湖北云应盐矿地下600-700m的含泥岩夹层的层状氯化钠盐岩试件为研究对象。进行常规力学实验和不同应力批次下的单轴压缩蠕变试验,发现层状盐岩是一种特殊的组合软岩，其弹性模量比较少，盐岩层横向变形能力很大．蠕变试验得出：（1）在充分长的蠕变时间内，层状岩盐蠕变的衰减蠕变阶段、稳态蠕变阶段、加速蠕变阶段显现明显，且加速蠕变阶段持续时间较长：（2）在稳态蠕变阶段出现了夹层内陷和盐岩层外鼓现象．这种不协调蠕变将导致层面的剪切错动建立层状岩盐蠕变破坏模型，定义层状盐岩蠕变损伤变量为盐岩试件环向拉应变与盐岩的极限拉应变之比从理论上揭示了夹层与盐岩层蠕变特性的差异而导致盐岩层蠕变破坏机理，较好地解释了夹层首先劈裂破坏，带动盐岩互层张拉裂纹扩展的实验现象．
英文摘要：
Taking the Sodium Chloride rock salt specimens containing mudstone interbed, located at 600-700 m level of Yunying salt-mine in Hubei Province as the researeh objects, the conventional mechanical tests on the specimens and uniaxial compression creep tests on the specimens under multi batch stress levels were performed. The conventional mechanical tests obtained the result that the bedded rock salt is a kind of special combined soft rock, its elastic modulus is comparative little, but lateral deformation of the rock salt is great under uniaxial compression stress state. Through creep experiments, the results were obtained as follows： （1）If the duration of creep is enough long, the attenuation creep stage, the steady creep stage and the accelerative creep stage are appeared during the bedded rock salt creep, with the accelerative creep stage last longer compared with other rocks. （2）The phenomenon of invagination of interlayer and bulge of rock salt is found at the steady creep stage. Uncoordinated creep deformation may lead to shear dislocation in the interbed. Creep failure model of bedded rock salt is also established in which the damage variable is viewed as the ratio of the ring tensile strain of specimens and ultimate tensile strain. Mechanism of creep failure in the rock salt strata induced by the differences in creep characteristics of the interlayer and that of rock salt theoretically is revealed. The experimental phenomena that the interlayer splits failure firstly, then the failure of interlayer driving tension cracks propagating in interbedded rock salt is reasonably explained.
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