空军工程大学学报（自然科学版）Issue(5)：20-23,4.DOI:10.3969/j.issn.1009-3516.2015.05.005
高应力条件下黄土三轴蠕变试验及经验模型
Triaxial Creep Test on Loess and A Study of Empirical Models under Conditions of High Stress
摘要
Abstract
To investigate the creep properties of loess in highfill foundation under conditions of high stress and different depth,the CU triaxial creep tests of loess at Yan'an airport are carried out under conditions of different confining pressure.The creep curves of multistep constant load and the equaltime stressstrain curves are obtained by using"Chen method".The results indicate that the creep properties of the lo-ess are obviously influenced by stress level.The stressstrain presents linear properties under conditions of lower stress,and shows nonlinear creep properties under conditions of higher stress.Taking the confining pressure 600 kPa for example,an empirical creep model is proposed in which the stressstrain is described by exponential function and the straintime is described by hyperbolic function.The result shows that the model proposed and the empirical data are high in fitting degree,simple in formality,few in parameters and easy in achievement,can further reflect and predict the creep properties of the loess at Yan'an airport engineering compared with SinghMitchell and Mesri models.关键词
黄土/高应力/三轴蠕变试验/陈氏法/经验蠕变模型Key words
loess/high stress/triaxial creep test/Chen method/empirical creep model引用本文复制引用
张昊,顾强康,裴元新,王乐凡,刘少博,殷帛成..高应力条件下黄土三轴蠕变试验及经验模型[J].空军工程大学学报（自然科学版）,2015,(5):20-23,4.基金项目
陕西省青年科技新星项目资助(KJXX??81) （KJXX??81）
