摘要
利用带有压力密封仓的三轴蠕变仪进行了不同孔隙水压力条件下软岩蠕变试验,通过最小二乘回归分析对蠕变方程进行了参数识别.研究表明:孔隙水压力对软岩蠕变影响显著,主要体现在初始应变量和弹性参数的变化;不同应力水平作用下,软岩蠕变存在着明显的应力阙值,在高应力水平作用时,蠕变表现为完整的3个阶段,稳定蠕变阶段比较短暂.
Creep experiments were conducted using the triaxial creep testing apparatus with pressure sealed store- house, and the least square method was used to parameters identification for creep equation under different pore water pressures. The results show that pore water pressure have significant effect on creep laws of soft rock, mainly embodies in the changes of initial strain and elastic parameters. The creep exist stress threshold under different stress levels, when being affected by high stress levels, the creep represent whole three stages, the steady creep stage is transitory.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2009年第8期1067-1070,共4页
Journal of China Coal Society
基金
国家自然科学基金资助项目(50574048)
关键词
孔隙水压力
软岩蠕变
三轴蠕变仪
pore water pressure
soft rock creep
triaxial creep testing apparatus
