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被广泛采用的等价线性黏弹性模型不寻求土体动应力-应变的具体表达式,无法给出能量耗散函数,为深入研究筑坝土石料动力变形机制带来不便。变参数Ramberg-Osgood模型(简称R-O模型)通过变动两个参数以适应土体动模量衰减和阻尼增长,并给出滞回圈的数学表达式。研究中讨论了变参数R-O模型的适应范围,发现该模型不适合描述土体的小应变动力特性,给出了筑坝土石料变参数表达式,绘制了与试验曲线相协调的应力应变滞回圈。可以看出变参数R-O模型能够较好地描述筑坝土石料的动力特性,为进一步研究筑坝土石料的动力耗散与变形机制奠定了基础。
The widely used equivalent linear viscoelastic model does not seek the specific expression of soil dynamic stress-strain, and can not give the energy dissipation function, which brings inconvenience to the further study on the dynamic deformation mechanism of earth-rock dam. Variable parameters The Ramberg-Osgood model (referred to as the R-O model) adapts to the dynamic modulus attenuation and damping growth of soil by changing two parameters and gives the mathematical expression of hysteresis loop. In this study, we discuss the adaptability of the variable parameter RO model. It is found that the model is not suitable for describing the small-strain dynamic characteristics of the soil. The expressions of soil-stone variable parameters are given and the stress-strain hysteresis ring. It can be seen that the variable parameter R-O model can well describe the dynamic characteristics of the earth-rock materials for dam construction, which lays the foundation for further study on the dynamic dissipation and deformation mechanism of the earth-rock dams.