摘要
为了研究黄土路堤的沉降特性,基于室内一维固结试验,从流变角度分析了重塑黄土的变形特性;在此基础上,从简单的Kelvin模型入手,引入非线性应力、应变关系的割线模量,利用变参数法建立了描述重塑黄土变形特性的非线性模型,并进行了计算值与实测值的比较分析。结果表明:随着时间的增加,各应力水平下的应变逐渐趋于稳定,不会出现破坏现象,且基本呈双曲线关系;变形属非线性衰减型,且非线性程度随着应力水平的提高而增强;非线性模型中含有4个土性参数,均可由室内一维固结试验得出;计算值与实测值吻合较好,表明该模型具有较高的可靠性,为研究黄土路堤沉降特性提供了有力依据。
In order to analyze the settlement characteristics of loess road embankment, based on one-dimensional consolidation tests, the deformation characteristics of remolded loess are analyzed from the angle of theology. The results of tests show that the strain will level off to a certain extent with time under every stress level and the failure will not appear. The relation of strain and time can be described by hyperbolic model. The deformation belongs to non-linear attenuation and the degree of non-linearity strengthens when the stress level increases. According to the deformation characteristics, using non-linear secant modulus and varying parameters method, the non-linear model based on Kelvin model is proposed. The model can describe the deformation eharaeteristics of remolded loess. The model involves 4 parameters in connection with properties of soil and they can be gotten from one-dimensional consolidation tests easily. At last, through the comparison of calculated value with measured one, the reliability of the model is testified. It provides powerful reference {or studying the settlement characteristics of loess road embankment. 8 figs, 8refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第5期31-34,共4页
Journal of Chang’an University(Natural Science Edition)
基金
国家西部交通建设科技项目(200131881214)
作者简介
程海涛（1980-），男，山东金乡人，工学博士。E-mail：chenghaitao1991@163.com。
