等应变率加载下冻土粘弹塑性应力应变本构模拟  

Constitutive Analog for Frozen Soil Test Stress-strain Curves under Constant Strain Rates

作　　者：李健康[1] 

机构地区：[1]沙洲职业工学院,江苏张家港215600

出　　处：《沙洲职业工学院学报》2009年第3期1-6,16,共7页Journal of Shazhou Professional Institute of Technology

基　　金：中科院冻土工程国家重点实验室资助项目(200102)

摘　　要：借助模型分析,通过等应变率下对不同含水量、不同温度的兰州粉结冻土试样在单轴加载条件进行应力测试,得到应力应变曲线。根据粘弹塑性体模型,结合试验曲线特征,选择应力应变的方程形式。以其中一个组典型的试验结果为例进行拟合数据处理,获得拟合的应力应变曲线,确定方程中的参数。再将方法用于不同情况下的实验曲线处理,得到10%和20%两种含水量;-10oC和-20oC两种试验温度下冻土试样的测试的应力-应变三阶段全过程本构方程。结果表明,由此得到的方程能很好地描述冻土的材料特性。By means of model analyses the curves of stress-strain have been attained by testing the samples of frozen soil in Lanzhou, which possess different content of water, in uniaxial stress condition and different temperature with the constant strain rates. According to the viscous-elastic-plastic model and the feature of stress-strain curves, the formulas of stress-strain have been determined. In this work, those estimated curves of stress-strain and parameters of the formula could be provided by one series of typical experiment processed results. And this method can also handle the experiment curves with different situations of process. It has been found that the formulas can more accurately describe the features of frozen soil with the proposed method.

关 键 词：人工冻结土 粘性材料 应力应变曲线 本构方程 

分 类 号：P642.14[天文地球—工程地质学]