作　　者： ; ; ;

机构地区： 长安大学公路学院

出　　处： 《岩石力学与工程学报》 2007年第A01期3203-3208,共6页

摘　　要： 基于静三轴仪,进行控制不同加载速率的连续加载K0固结试验,研究连续加载条件下K0固结过程中土体的变形特性及加载速率的影响。试验结果表明:加载过程中没有产生超静水压力,加载阶段应力–应变关系可以分为两个阶段,前一个阶段呈幂函数关系,后一阶段呈直线关系;连续加载的加载速率对加载阶段应力–应变特性影响不明显;加载阶段完成时K0值随加载速率的增大而略有减小;稳压阶段应变–时间关系呈双曲线关系,且加载速率对稳压阶段变形特性有较大影响。提出连续加载条件下的K0固结过程应变–应力–时间关系模型,为研究K0固结过程中土体变形特性及路堤沉降提供参考。 In order to analyze the deformation characteristics of compacted loess and influence of loading rate,K0 consolidation tests under continuous loading with different rates are carried out on geotechnical digital systems（GDS） triaxial apparatus.The results show that there is no excess pore water pressure in the loading stage.Stress-strain curve in the loading stage can be divided into two phases.The previous phase can be fitted with power function and the second phase with linear function.The influence of loading rate on the stress-strain relation in the loading stage is not obvious.The value of K0 at the end of loading stage decreases with the increase of loading rate.During the stage with steady pressure,the strain-time curve can be fitted with hyperbolic function;and the influence of loading rate on the strain-time behavior in this stage is obvious.At last the model describing the strain-stress-time relation during the stage of continuous loading is proposed.It provides references to the study of deformation characteristics during the stage of continuous loading and the settlement characteristics of loess embankment.

关 键 词： 土力学 压实黄土 固结 加载速率 应变 应力 时间关系 连续加载

领　　域： [建筑科学] [建筑科学]