摘要
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。
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 sah-mudstone interlayer is larger than that of mudstone and almost the same as that of rack sah. The duration of the first creep stage is mainly dominated by the salt part of sample. The stability creep rate of the second creep stage shows a large difference because the content of mudstone in salt- mudstone interlayer is different. Under the same stress conditions, the stability creep rate of the second creep stage of salt-mudstone interlayer is much larger than that of rock salt and less than that of mudstone. According to the property of the second creep stage of three kinds of samples and the volume content of mudstone in salt-mudstone interlayer, the relations between the creep parameters of salt-mudstone interlayer and the creep parameters of mudstone and rock salt were obtained.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2010年第1期42-45,共4页
Journal of China Coal Society
基金
国家自然科学基金资助项目(50774090)
关键词
含泥质夹层盐岩
蠕变特性
蠕变速率
伯格斯蠕变模型
salt-mudstone interlayer
creep property
stability creep rate
Burgers creep model
