摘要
通过对花岗岩进行动态三轴循环加卸载试验,研究花岗岩在围压条件下的疲劳损伤演化规律,发现其损伤变形过程可分为3个阶段,且岩石的侧向膨胀主导着疲劳损伤过程。同时通过分析围压条件对岩石疲劳损伤特性的影响规律。结果表明,围压和初始损伤对岩石疲劳寿命均有显著影响,揭示了当初始损伤一定时,岩石的疲劳寿命随围压增加而增长的规律。
The"fatigue"characteristics of rock under the action of cyclic loading have an important guiding effect on the design and construction of underground rock engineering.Dynamic tri-axial cyclic loading-unloading tests on granite were performed to study the fatigue damage evolution rule of granite under confining pressure.It was found that the damage deformation process can be divided into three stages,and the lateral expansion dominated the fatigue damage process of rock.At the same time,by analyzing the influence of the confining pressure on the fatigue damage characteristics of rock,it shows that the fatigue life of rock related to the confining pressure and initial damage significantly.And the fatigue life of the rock increases with the increase of confining pressure is revealed,when the initial damage is certain.
作者
黄正均
赵星光
张磊
HUANG Zhengjun;ZHAO Xingguang;ZHANG Lei(School of Civil and Resource Engineering,University of Science and Technology,Beijing 100083,China;Beijing Research Institute of Uranium Geology,Beijing 100029,China)
出处
《实验室研究与探索》
CAS
北大核心
2018年第8期15-19,共5页
Research and Exploration In Laboratory
基金
国家重点研发计划(2016YFC0600703)
中央高校基本科研业务费(FRF-TP-16-017A3)
