摘要
修正剑桥模型是基于临界状态理论下提出的一种描述黏土体应力-应变行为的弹塑性本构模型,具有形式简单、参数少并具有明确的物理意义,易采用试验确定,能够比较准确的描述黏土的应力-应变行为等优点。修正剑桥模型在描述土体力学行为时,需要表达土体有效应力p′,剪切力q和体积比υ的三者关系,这就要求将3个变量呈现在1个三维图表或者2个二维图表上。本文采用两种方法对模型中的3个变量进行归一化处理,通过对修正剑桥模型的屈服面方程进一步的推导和转化,将三者之间的关系用1个二维图形表示出来。与此同时,通过编写程序模拟土体三轴排水和不排水试验中的应力路径并将结果表现在二维图形中,发现模拟结果与常规方法一致,从而验证了该归一化处理的有效性和准确性。
The Modified Cam-claymodel is aelasto-plastic constitutive model which is used to describe the stress-strain behavior of soils.The model is simple because it was defined only by five parameters.It was established based on the critical state theory and can describe the behavior of clay more accurately.In addition,the parameters in themodel which can bedetermined easily by indoor soil tests have clear physical meanings.The relationship of the mean effective stressp′,the deviator stressqand specific volumeυwas usually used to describe the soils mechanical properties in the model.As a result,a three-dimensional figureor two two-dimensional ones which reflect the relationship between two variablesrespectively are needed.In this paper,the three variables in Modified Cam-claymodel were normalized using two different methods.Two-dimensional graphs which can reflectsp′：q：υrelationship were drawn respectively after further derivation and transformationof the model yield surface equation.At the same time,the stress paths of soil triaxial drained testand triaxialundrained test were simulated by programing and the results were drawn in two-dimensional figure.It is found that the stress path resultsconsistent with that obtained using the usual methods.Finally,the accuracy and rationality of the normalization methodsare confirmed.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2017年第3期95-100,共6页
Periodical of Ocean University of China
基金
国家自然科学基金项目(50779652)资助~~
关键词
修正剑桥模型
归一化
三轴排水试验
三轴不排水试验
Modified Cam-clay model
normalization
drained triaxial tests
undrainedtriaxial tests
