COx黏土岩三轴压缩蠕变特性及速率阈值试验研究

发布时间：2018-04-20 15:16

本文选题：岩石力学 + 黏土岩　；参考：《岩石力学与工程学报》2017年03期

【摘要】：黏土岩具有低渗性和自我裂缝修复能力等优点,被用于高放废物地质处置的候选基岩。出于高放废物处置库的长期性及高安全性要求,研究黏土岩的蠕变破坏特征显得极其重要。通过一系列黏土岩的单级三轴压缩蠕变试验,获得Callovo-Oxfordian(COx)黏土岩较为精确的蠕变速率阈值范围。试验结果表明,发生蠕变破坏的蠕变速率阈值与黏土岩的湿度及所处围压等因素有关。总体上,当轴向蠕变速率低于2.5με/h,该类黏土岩很难发生蠕变破坏;但若高于58με/h,则黏土岩极易发生加速蠕变破坏;而处于两者之间的速率值,目前试验尚无明确结论。该阈值可用于在稳定蠕变阶段判断黏土岩是否会出现加速蠕变破坏。
[Abstract]:Clay rocks have the advantages of low permeability and self-fissure repair ability, which are used as candidate bedrock for geological disposal of high-level radioactive waste. It is very important to study the creep failure characteristics of clay rock due to the long-term and high safety requirements of high-level radioactive waste repository. Through a series of unistage triaxial compression creep tests of clay rocks, a more accurate threshold range of creep rate for Callovo-Oxfordian CO _ x clay is obtained. The experimental results show that the creep rate threshold of creep failure is related to the humidity and confining pressure of clay rock. Generally speaking, when the axial creep rate is less than 2.5 渭蔚 / h, the creep failure of this kind of clay is very difficult, but if it is higher than 58 渭蔚 / h, the accelerated creep failure is easy to occur. The threshold can be used to determine whether accelerated creep failure will occur in clay rock during the stable creep stage.
【作者单位】：湖北工业大学岩土力学与混凝土材料中法联合研究中心;中国科学院武汉岩土力学研究所岩土力学和工程国家重点实验室;法国里尔科技大学里尔力学实验室;
【基金】：国家自然科学基金资助项目(51579093,51479193) 国家重点基础发展计划(973)项目(2015CB057905)~~
【分类号】：TU45

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