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含软弱夹层盐岩型盐力学特性试验研究

ISSN号：1000-6915
期刊名称：《岩石力学与工程学报》
时间：0
分类：TU45[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044, [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071
相关基金：国家重点基础研究发展计划（973）项目（2009CB724606）; 国家自然科学基金资助项目（51074198）,国家自然科学基金创新研究群体项目（50621403）

作者：姜德义[1], 任涛[1], 陈结[1], 任松[1], 范学勤[1], 杨春和[1,2]

关键词：岩石力学, 层状盐岩, 型盐, 软弱夹层, 应力-应变全过程, rock mechanics, layered salt rock, molded salt rock, weak interlayer, complete process ofstress-strain

中文摘要：

为研究不同夹层特征对含软弱夹层盐岩力学特性的影响规律,在现场取芯不易获得试样的情况下,采用压制型盐的办法制备出具有规则夹层特征的层状盐岩型盐,然后对其进行单轴及三轴压缩试验。试验结果表明,当夹层的厚度比和夹层的分布特征发生规则变化时,含软弱夹层盐岩型盐的强度、弹性模量、泊松比等力学参数及型盐体的变形和破损特征均发生一定规律性的变动。得到的结论如下：（1）含软弱夹层盐岩型盐的单轴抗压强度和弹性模量均随着夹层厚度比的增加而呈现下降趋势。（2）夹层厚度比一定时,3层夹层型盐的强度高于1和2层夹层型盐;而多夹层型盐随着夹层层间距的增加,其强度和弹性模量逐渐减小,但减小趋势变缓。（3）强度低的夹层部分径向应变大于强度高的纯盐层,破坏面总是始于强度高的纯盐层。试验结果为在室内开展层状盐岩地下储库的稳定性分析提供一种新方法。

英文摘要：

In order to study the influence of different interlayer characteristics on mechanical properties of molded salt rock with weak interlayer, regularly molded layered salt rock was made by pressing the molded salt rock, and uniaxial and triaxial compression tests were carried out, considering that samples are not easy to be obtained by coring in field. The results show that the mechanical parameters, such as strength, elastic modulus, and Poisson＇s ratio and the formation and failure characteristics of molded salt rock with weak interlayer change regularly to a certain extent as the interlayer＇s thickness ratio and distribution characteristics change regularly. The following experimental results can be drawn. （1） The uniaxial compressive strength and elastic modulus of molded salt rock with weak interlayer decline with the increase in interlayer＇s thickness ratio. （2） When the interlayer＇s thickness remains unchanged, the strength of molded salt rock with three interlayers is higher than that of molded salt rock with one or two interlayers. As the distance between interlayers increases, the strength and elastic modulus of molded salt rock with weak interlayer decrease gradually. （3） The pure salt rock with high strength has stronger radial strain than the interlayer with low strength, and the failure surface is always generated from the pure salt rock. Generally speaking, these results can provide a new method for analysis of mechanical properties of layered salt rock and stability of underground salt rock storage.

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