冻土蠕变的非线性模型研究  

Research on Nonlinear Model of Frozen Soil Creep

作　　者：曹伟[1] 项蒙佳 赵少飞[1] 

机构地区：[1]华北科技学院土木工程系,北京东燕郊101601

出　　处：《华北科技学院学报》2015年第3期82-86,100,共6页Journal of North China Institute of Science and Technology

基　　金：中央高校基本科研业务费资助(3142015047)

摘　　要：为了研究冻土的蠕变特性,在传统的伯格斯模型中引入一种考虑时间和应力水平影响的非线性黏滞体,代替与弹簧并联的理想牛顿流体,并在此基础上串联一个由非定常、非牛顿黏壶和塑性体并联的新的非线性黏塑性体,从而建立了新的非线性模型,并推到了三维应力状态。随后采用该模型借助Origin软件对冻土蠕变的试验数据进行拟合。结果表明:1该模型所拟合的曲线与试验数据吻合性较好,误差很小,而且适用于不同的温度。2该模型不仅可以很好地描述冻土蠕变的前两个阶段,而且对于加速阶段也适用,这对于高应力下的冻土蠕变分析很有意义。In order to study the creep characteristics of the frozen soil , a kind of nonlinear viscous body which considers the influence of time and stress level is used to instead the ideal Newtonian fluid which is parallel with the spring.Based on this part ,a non-constant and non -Newtonian visco plastic body is connected in series with it , so a new nonlinear visco -elastic model is established .The equation of three -dimensional stress state is deduced.Then using this model , the experimental data of frozen soil creep is fitted by Origin software.The result shows that：①The fitting curves have good agreement with the test data and the model is suitable for the data indifferent temperatures.②The creep model can describe not only the the first two stages of the frozen soil’s creep, but also the accelerating stage.It is very meaningful to analyze the frozen soil creep under high stress.

关 键 词：冻土 蠕变 伯格斯模型 加速蠕变 

分 类 号：TU445[建筑科学—岩土工程]