【摘要】 采用RLJW-2000型岩石三轴流变伺服仪,在分级加载条件下对三峡地区中三叠统巴东组二段粉砂质泥岩进行了三轴压缩应力松弛试验。结果表明:不同应变水平下的应力松驰曲线具有相似的形态,应力衰减轨迹为连续光滑的曲线,在瞬间施加一定应变后,保持应变恒定,刚开始应力衰减的速度非常快,之后应力缓慢降低,最终趋于一个稳定值,为非完全衰减型松弛。基于试验结果,建立了粉砂质泥岩应力松弛的经验本构模型。更多还原

【Abstract】 The stress relaxation test of sandy mudstone of 2rd member of Badong formation of Middle Tertian under triaxial compression was performed with the RLJW-2000 rock triaxial servo-controlled rheometer by step loading method.The results show that law of test curves under different stress levels is similar,and the stress decaying track is the smooth continuous curve.After transient strain is applied to the rock specimen,the decaying velocity of stress is very high at the begining,and then the decaying velocity of stress gradually drops with time under the condition of constant strain.The decaying velocity of stress is trend to be a constant finally,which is non-completely decaying stress relaxation.Based on test results,the stress relaxation of sandy mudstone is divided into three stages,and an empirical constitutive model for the stress-strain-time behavior of sandy mudstone is established.更多还原