###
DOI:
工程科学与技术:2017,49(Z2):165-172
←前一篇   |   后一篇→
本文二维码信息
码上扫一扫!
含杂质盐岩三轴蠕变特性试验研究(研究生论坛稿件)
(四川大学水利水电学院)
Study on creep properties of salt rock with impurities during triaxial creep test
(State key Lab. of Hydraulic and Mountain River Engineer, College of Water Resource and Hydropower, Sichuan Univ)
摘要
图/表
参考文献
相似文献
附件
本文已被:浏览 1594次   下载 503
投稿时间:2016-08-26    修订日期:2016-12-26
中文摘要: 针对杂质盐岩蠕变力学特性问题,利用四川大学大型程控流变仪,对两种不同杂质盐岩进行了分级加载下的三轴蠕变试验。试验结果表明:围压和杂质含量不同,盐岩破坏形态以及力学参数均有差异。围压小于临界围压,盐岩呈剪切破坏,围压大于临界围压,盐岩呈大变形鼓状破坏;围压和杂质含量一定,岩盐稳态速率随偏应力增加呈指数增长;偏应力和杂质含量一定,蠕变速率随围压增大而降低,长期强度有所增大;偏应力和围压一定,低杂质(ω=2.1%)盐岩稳态蠕变速率高于高杂质(ω=46.8%)盐岩。体积变形经历了压密期-平静期-扩容期三个阶段,高杂质盐岩体积应变低于低杂质盐岩。将不溶物杂质含量与应力敏感性常数n的关系同分数阶蠕变本构方程进行耦合,建立了耦合杂质的盐岩分数阶非定常蠕变模型,将理论模型与试验数据对比分析证实了该模型的合理性。
中文关键词: 三轴  蠕变  杂质  盐岩  体积变形  分数阶本构模型
Abstract:In order to study creep characteristics of salt rock with impurities, the triaxial loading tests about two salt rock with different impurity content were carried out on large-scale programmable rheometer of Sichuan university, The results showed that the failure pattern and mechanical parameters of salt rock are different as the change of confining pressure or content of impurities, The destructional form of salt rock change from shear to drum type when the confining pressure increase. The steady-state creep rate of each sample grows exponentially with the deviatoric stress when confining pressure and impurity content is the same. As increase of confining pressure, the creep rate is depressed, but the long-term strength is increased when deviatoric stress and impurity content is the same. The steady-state creep rate of low-impurity(ω=2.1%) is higher than high-impurity(ω=46.8%) when deviatoric stress and confining pressure is the same. Volume strain experienced three period:pressure dense-quiet-dilatation, the volume strain of salt rock with high impurities inferior to the low impurity.A fractional unsteady creep damage model is established by introducting the relationship between insolubles impurity content and stress sensitivity constant to constitutive equation of creep.The reasonability of this model was proved by comparing the theory model with experimental data.
文章编号:201600854     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目( 51120145001; 51374148) ; 四川省科技计划资助项目( 2015JY0111)
作者简介:
引用文本:
吴池,刘建锋.含杂质盐岩三轴蠕变特性试验研究(研究生论坛稿件)[J].工程科学与技术,2017,49(Z2):165-172.
wuchi,Liu Jianfeng.Study on creep properties of salt rock with impurities during triaxial creep test[J].Advanced Engineering Sciences,2017,49(Z2):165-172.