考虑温度影响的饱和软黏土累积变形特性研究  

Characteristics of cumulative deformation of saturated soft clay considering temperature effect

作　　者：刘干斌[1] 范思婷 陈斌[2] 陶海冰[1] 叶俊能[2] 

机构地区：[1]宁波大学岩土工程研究所,浙江宁波315211 [2]宁波市轨道交通工程建设指挥部,浙江宁波315010

出　　处：《岩土工程学报》2016年第7期1238-1245,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51278256;51478228)

摘　　要：通过开展饱和软黏土温控动三轴试验,研究了不同温度作用下土的不排水累积变形、孔压、阻尼比及动弹性模量变化规律,建立了考虑温度、初始静偏应力、围压、超固结比等影响的应变模型,并获得了模型参数与温度的关系。结果表明:温度对土的累积塑性变形、孔压、阻尼比及动弹性模量有较大影响,土体的累积塑性应变、孔压、阻尼比均随着温度升高而减小,动弹性模量则随着温度升高而增大,土体表现出热硬化特征;在不同温度作用下,考虑温度影响的应变模型计算结果与试验结果较为吻合,验证了模型的合理性,可用于预测同一试验工况下任意温度时土的累积塑性应变结果。The temperature-controlled cyclictriaxial testson Ningbo soft clayarecarried out to studycumulative deformation, pore pressure, damping ratio and dynamic modulusof soilsunder different temperatures and undrained conditions.Astrain constitutive model is developedconsidering the effects of temperature, initial static deviator stress, confining pressure, overconsolidation ratio and other factors, and the relationship between the model parameters and temperature is obtained.It is shown thatthe temperature has great influence onthecumulative plastic deformation, pore pressure, damping ratio and dynamic modulusof soils.Thecumulative plastic strain, pore pressure anddamping ratio decrease gradually with the increase of temperature,and thedynamic elastic modulus increases with the increase of temperature, thus heat hardening characteristic is revealed.Inaddition, thecalculated resultsusing thestrain constitutive model considering the influence of temperature are consistent withthe experimentalones, which verify the rationality of the model.Furthermore,the proposed model can beused topredictthecumulative plastic strain resultsof soilsunder the same condition of arbitrary temperature.

关 键 词：温控动三轴试验 温度效应 应变模型 累积塑性应变 

分 类 号：TU43[建筑科学—岩土工程]