饱和重塑网纹红土恒应力比路径下应力应变特性

Characteristics of stress and strain on saturated remodeling reticulate red clay under constant stress ratio path

针对土体在恒应力比路径下应力应变的复杂性问题,本文采用应力控制式全自动GDS静三轴仪对几组含水率相同、干密度相同的饱和重塑网纹红土试样分别进行了不同恒应力比路径下三轴固结排水试验,通过试验结果探讨了应力应变之间的关系。试验结果表明:当加载速率保持恒定时,不同恒应力比路径下的轴向应变与加载时间关系曲线、轴向应力与轴向应变关系曲线均呈直线型;通过拟合试验结果得到了轴向应变与时间、应力比的关系及轴向应变与轴向应力、应力比的关系,这可以很好地预测实际工程中的沉降量。

In view of the problem of the complexity of stress and strain on the constant stress ratio path,the study on the characteristics of stress and strain under constant stress ratio path was carried out.Several consolidated drained triaxial tests on saturated remoulded specimens of reticulate red soil are conducted under different constant stress ratio path by the stress control type automatic GDS static triaxial apparatus.The relationship between the stress and strain is explored through the experiment.The experimental analysis results show that when the loading rate is constant,axial strain under different constant stress ratio path and loading time shows a linear relationship,the axial stress-axial strain curve under different constant stress ratio path is linear;the relationship between stress ratio and axial stress-axial strain and stress ratio and axial strain-time are obtained by test data fitting which could be used to predict settlement in the engineering practice.