饱和粘土蠕变特性研究及参数确定  

Study on Rheology Property of Saturated Soiland the Parameter Confirmed

作　　者：周镇勇[1] 魏丽敏[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《石家庄铁道学院学报（自然科学版）》2009年第4期48-51,55,共5页Journal of Shijiazhuang Railway Institute

基　　金：铁道部科技研究开发计划项目(2005K002-B-6)

摘　　要：将两种弹一粘弹性模型（Burgers和H-2K模型）的一维蠕变方程，转换成三维状态下的应力．应变．时间关系，分别推导出常应力下两种模型的轴向应变随时间变化的方程。采用分级加载法进行室内长期单轴压缩蠕变试验，结合两种模型三维应力状态的轴向应变表达式，对试验结果进行拟合，得出相应模型的本构参数。试验结果表明：饱和粘土在新增荷载作用下2—3d变形趋于稳定，Burgers模型和H-2K模型均能较好地模拟饱和粘土的衰减蠕变过程；而H-2K模型能更好地模拟土样在常应力作用下的蠕变特性。The equations of the relationships between axial strain and time for two elastic-viscoelastic models （Burgers model and H-2K model） are deduced under constant stress by transforming single dimension theological equations into three dimension strain-stress-time relationship. Long-term single axle rheological experiments are conducted by using stage loading. According to the two models＇ expression of three dimensional stress and axial strain, constitutive parameters are obtained by fitting the experiment results. It is shown from the experi- ences that the deformation of the saturated clay soils tends to be stable within 2 or 3 days under newly-stress, and the process of creep can be simulated by both Burgers model and H-2K model, while the characteristic of de- formation can be modeled better by H-2K model.

关 键 词：蠕变 BURGERS模型 H-2K模型 本构参数 

分 类 号：TU411[建筑科学—岩土工程]