摘要
卸载状态下冻土三轴蠕变试验结果表明,冻土具有明显的剪胀性,且体积应变不能忽略。为了全面反映冻土在卸载状态下的蠕变变形规律,以简单的黏弹塑模型为基本流变元件,提出了冻土服从椭圆-DP双屈服面流变本构力学模型。通过有限元程序的二次开发,将该模型嵌入到ADINA有限元程序中。对冻土三轴蠕变试验过程进行了数值模拟表明,椭圆-DP型双屈服面本构力学模型能够较好地反映冻土的剪胀性和体积应变等变形性质,数值模拟和试验结果吻合良好,可为冻土工程数值计算提供参考。
The results of triaxial creep experiments for unloading state show that the frozen soil has an obvious dilatancy, and its volume strain should not be neglected. To fully reflect creep deformation laws of frozen soil under unloading state, a rheological constitutive dynamic model of frozen soil submitting to ellipse-DP two-yield-surface is put forward by using Nishihara model as the basic element. And the model is embedded in ADINA finite element program on the base of secondary developing technique for finite element program. The results of numerical simulation for triaxial creep experiments show that the constitutive dynamic model of ellipse-DP two-yield-surface can reflect some deformation properties of dilatancy and volume strain of frozen soil very well; and it can coincide with the experimental data, which can provide references for frozen projects calculation.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第11期2337-2342,共6页
Rock and Soil Mechanics
基金
获安徽省高校青年教师基金资助(No.2007JQ1044)
安徽理工大学青年教师基金资助(No.QN200607)
关键词
双屈服面模型
卸载
剪胀性
体积应变
数值模拟
two-yield-surface model
unloading
dilatancy
volume strain
numerical simulation Lade
