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针对土石混合体填筑路堤工后沉降的非线性蠕变特性,提出了一种能考虑材料非线性黏弹性变形的蠕变模型。基于目前对土石混合体蠕变机理研究,将路堤工后的蠕变沉降部分考虑为非线性的衰减蠕变过程,建立了修正的Kelvin模型、广义修正模型,且得到了模型参数的识别方法;通过对修正模型分析表明,非线性常数取值对蠕变曲线变化有较大影响,修正模型的蠕变长期应变值比Kelvin模型要小;结合相关文献中对土石体填料的蠕变试验研究资料,用修正Kelvin模型对试验结果进行拟合,并对参数进行了反演,反演效果良好。修正模型的建立可为编制非线性黏弹性数值计算软件提供理论基础。
Aiming at the nonlinear creep characteristics of embankment after embankment filled by soil-rock mixture, a creep model considering the nonlinear viscoelastic deformation of materials is proposed. Based on the current research on the creep mechanism of soil-rock mixture, the creep settlement after embankment construction is considered as the non-linear decay creep process. The modified Kelvin model and generalized correction model are established and the identification method of model parameters is obtained. Through the analysis of the modified model, it is shown that the value of nonlinear constant has a great influence on the change of creep curve. The long-term creep strain of the modified model is smaller than that of Kelvin model. Combined with the creep test data , The modified Kelvin model is used to fit the test results, and the parameters are inverted. The inversion effect is good. The establishment of the revised model can provide a theoretical basis for compiling nonlinear viscoelastic numerical calculation software.