摘要
借助于高精度微机控制多通道水压轴压联合作用岩石流变试验系统,对灰岩进行水环境中的压缩流变试验,采用相同水围压力和不同轴向压力连续加载方式,开展水压轴压共同作用下灰岩蠕变特性的初步研究。试验结果表明:相同水压环境中,轴向变形量随着应力水平的增加而增大,且变形速率随着时间的增加而减小;岩石蠕变破坏模式与轴向应力有关,可能存在某一应力阈值,低于该轴向应力阈值时岩石为张拉破坏,超过该阈值时岩石呈剪切破坏;初步分析了水压影响岩石蠕变的机制,可为研究水压环境中地下工程的长期稳定性提供参考依据。
By continuously loading with the same water confining pressure and different axial pressure, the creep characteristics of limestone subjected to water pressure and axial pressure were experimentally studied prelimi- narily by rock creep testing system. The test results showed that under the condition of the same water pressure en- vironment, the axial deformation increased with the increase of stress level, and the deformation rate decreased with the increase of time. Rock creep failure model is associated with the axial stress, there may be a stress threshold, below the threshold the rock will show a tension failure model and exceed the threshold show a shear failure model. At last the mechanism of rock creep subjected to water pressure and axial pressure is analyzed preliminarily. The results can be provided a reference for the long-term stability of underground engineering.
出处
《科学技术与工程》
北大核心
2015年第15期200-203,208,共5页
Science Technology and Engineering
基金
国家自然基金项目(51369001)资助
关键词
岩石力学
轴向荷载
蠕变特征
长期强度
水岩作用
弱化机理
rock mechanics action weakening mechanism axial loading creep characteristics long-term strength water-rock
