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因目前在模拟长期交通荷载作用下粉砂土路基不均匀变形时尚缺乏一套严谨、高效的计算模型,在室内静力及动三轴试验的基础上,通过引入安定性理论,基于弹塑性本构理论框架,提出了一个能合理反映粉砂土复杂变形机理的双屈服面等效黏塑性本构模型。对粉砂土动三轴试验结果的模拟表明,该模型采用完全隐式的积分方法,可任意选取积分步长,计算效率高,模拟效果良好。最后,将该模型在有限元程序中进行了实现,可应用于路基不均匀累积变形的计算。
Due to the lack of a rigorous and efficient computational model for the uneven deformation of silt subgrade under simulated long-term traffic loads, based on the static and dynamic triaxial tests in indoor, by introducing the stability theory and based on elastoplastic Structure theory, an equivalent visco-plastic constitutive model of double yield surface that can reasonably reflect the complicated deformation mechanism of silty sand is proposed. The simulation of the triaxial test results of silt soil shows that the model adopts a completely implicit integration method, the integral step length can be chosen arbitrarily, the calculation efficiency is high, and the simulation effect is good. Finally, the model is implemented in the finite element program and can be applied to the calculation of uneven cumulative deformation of subgrade.