结构性软土粘弹塑性边界面损伤本构模型

Constitutive Model of Visco-elasticity Plasticity Boundary Surface Damage of Structural Soft Soil

在软土流变性的滞后流变理论基础上,引入考虑损伤和各向异性影响的边界面理论,建立结构性软土粘弹塑性边界面损伤本构模型,并将软土的粘弹塑性边界面损伤模型计算结果与常规室内三轴蠕变试验数据进行比较分析。结果表明:对应不同偏应力比,围压较高时的轴应力-时间曲线和孔隙水压力-时间曲线蠕变特征明显,围压较低条件计算曲线略低于对应试验数据,表明初始作用阶段模型参数设定、土样的试验误差等因素误差导致土样初始变化具有复杂性,但总体计算模型同试验数据基本吻合,表明模型分析的有效性。

On the basis of lagging rheological theory of soft soil rheological property,the theory of anisotropic boundary surface theory considering the effects of injury is introduced in setting up constitutive model of visco-elastic plastic boundary surface damage for structural soft soil and the model calculation results of soft soil is compared with indoor triaxial creep test data.The results of the comparison indicate:in corresponding to different deviatoric stress ratio and under the higher confining pressure the characteristics of curve about the axial stress-time curve is obvious,as well as the pore water pressure and time curve,corresponding to the test data,the calculated curve is lower than the test data under low confining pressure conditions,which shows the initial change soil sample may be complex due to model parameter setting,soil sample test error and so on,but the overall calculation model is consistent with the test data,which proves the effectiveness of the model analysis.