论文部分内容阅读
以WF12440型空心圆柱扭剪仪为实验平台,通过室内饱和黄土动三轴液化试验,探讨了饱和兰州黄土液化过程中残余应变的发展规律:应力-应变滞回特性随着振动次数的增加发生变化,塑性逐步增大;当残余应变小于2%时,增长缓慢;此后,残余应变上升速率加大,3%应变一般出现在“初始液化”前;3%应变后,应变大幅增加,孔压有可能达到初始有效固结围压,也有可能在“初始液化”前破坏;3%残余应变是黄土稳定变形和大幅变形的临界点。循环应力比越大,试样的孔压上升越不充分,越容易于“初始液化”前破坏。
The WF12440 hollow cylinder torsion shear was used as the experimental platform to study the rule of residual strain during the liquefaction of saturated Lanzhou loess through dynamic triaxial liquefaction test of saturated loess: stress-strain hysteresis changes with the increase of vibration frequency , The plasticity gradually increases; when the residual strain is less than 2%, the growth slows down; thereafter, the rate of increase of residual strain increases, 3% strain generally appears before “initial liquefaction”; strain increases sharply after 3% strain, Pressure may reach the initial effective confining confining pressure, it is also possible to destroy before “initial liquefaction”; 3% residual strain is the critical point of loess stable deformation and large deformation. The greater the cyclic stress ratio, the more insufficient the pore pressure of the sample increases, and the easier it is for the “initial liquefaction” pre-destruction.