粉土动态回弹模量预估模型评估与改进

Prediction and Modified Models of Dynamic Resilient Modulus for the Silt

为了综合评估粉土动态回弹模量对围压和偏应力的显著依赖性,在既有粉土在不同含水率和压实度下的动三轴试验基础上,采用典型的应力相关复合模型对试验结果进行了参数回归和预测能力评价。为提高回弹模量预估模型的适用性,考虑八面体剪应力在预估模型中的比例,对已有模型进行了改进。结果表明,不同的回弹模量预估模型对试验数据的拟合效果有较大的差异,而改进的模型具有较高的决定系数,提高了回弹模量的预估准确度。

For comprehensively assessment of the significant dependent of the dynamic resilient modulus on confining pressure and deviatoric stress,the stress dependent composite models were adopted to perform parameter regression and evaluation of prediction ability based on the dynamic triaxial experi- ments under different moisture contents and compaction degrees. A modified model was proposed by con- sidering the proportion of octahedral shear stress in the prediction model to improve the applicability of re- silient modulus prediction model. Results showed that there is a large difference in predicting experiments and the modified model has a high determination coefficient,which implied that the modified model im- proved the accuracy in predicting the resilient modulus.