土体的动剪应变幅值是分析土体动力特性的关键参数,针对掺砂、砾的路基黏土改良填料,进行了一系列不同围压、动偏应力、压实度、含水率条件下的大型动三轴试验,探讨了改良填料累积塑性应变的增长特点和类型,分析了动剪应变与累积塑性应变增长的内在联系,最终得出了区分累积塑性应变增长类型的动剪应变门槛,由此可以利用土体所表现出的动剪应变值判断其动力稳定性.%Dynamic shear strain value is an important parameter for analysis on soil dynamic stability.In view of subgrade improved packing from clay mixing with sand and gravel,this paper carried out a series of large-scale tri-axial tests with different confining pressure,dynamic deviator stress,degree of compaction and water content.The feature and type of cumulative plastic strain are discussed.The relationship of dynamic shear strain and cumulative plastic strain is analyzed.Finally,the dynamic shear strain threshold is acquired in order to distinguish the type of cumulative plastic strain.The achievement of this research provides a method for determining packing's dynamic stability by its dynamic shear strain value.
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