【摘要】 根据饱和黄土在动荷载振动作用下的试验结果提出了以黄土的3%应变为主要考虑因素的液化破坏标准。试验表明:在固结不排水的动三轴试验中,黄土结构连接强度随循环次数的增加而逐渐丧失,体积收缩,在不排水条件下转化为孔隙水压力的上升和有效应力的下降,最终可能出现"初始液化"和"循环活动性"现象。3%轴应变一定出现在"初始液化"前;3%轴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%轴变形是黄土稳定变形和大幅变形的临界点。更多还原

【Abstract】 Based on the result of saturated loess in dynamic triaxial test the 3%axial strain is put forward as the key parameter of the liquefaction criterion.The tests show:for the consolidated-undrained tests(CU)of the undisturbed loess, with increasing of the cycles,the structural bonding strength fades away and the volume shrinkage,which transforms into increasing of the pore pressure and decreasing of the effective stress.At last,the"initial liquefaction"and"cyclic activity" phenomena may occur.Normally,3%axial strain occurs before the"initial liquefaction"phenomenon and after that,strain increases obviously and pore pressure may reach the initial effective consolidation pressure.Sometimes the sample may be destroyed before the"initial liquefaction".3%axial strain is the critical point between being steady-state deformation and being large deformation.更多还原