【摘要】 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。更多还原

【Abstract】 Using the WF12440 dynamic hollow cylinder apparatus as test platform,this paper studied the characteristics of residual strain of saturated loess during its liquefaction.Test results show that the hysteresis loop of deviatoric stress—axial strain of the loess developed with the increase of cycles and the plastic strain increased step by step.When the axial strain was less than 2%,it increased slowly;afterwards,its increase ratio was much larger,and a strain of 3% appeared normally before the "initial liquefaction" process.And after that,the strain increases obviously and the pore pressure may reach the initial effective consolidation pressure.Sometimes the sample may be destroyed before the "initial liquefaction" phenomenon.A 3% axial strain is the critical point between steady deformation and large deformation of the loess.The more the cyclic stress ratio,the less the pore pressure and the more easily destroyed before the "initial liquefaction".更多还原