论文部分内容阅读
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。
Clay rock has the advantages of low permeability and self-crack repair ability, and is used as a candidate bedrock for geological disposal of high level radioactive waste. Due to the long-term and high safety requirements of HLW disposal repository, it is very important to study the creep failure characteristics of clay rock. Through a series of single-stage triaxial compression creep tests on clay rocks, the more accurate creep rate threshold range of Callovo-Oxfordian (COx) clay rocks is obtained. The experimental results show that the creep rate threshold of creep damage is related to the clay rock humidity and confining pressure. In general, when the axial creep rate is lower than 2.5με / h, creep failure of such clays is very difficult to occur. However, if the creep rate is higher than 58με / h, the creep damage of clays can easily occur. The rate between the current test no clear conclusion. This threshold can be used to determine if creep damage will occur to clay rocks during steady creep.