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运用统计方法,给出了堆石料动剪模量比衰减及阻尼比增长的平均曲线表达式。建立了反映堆石料非线性和滞回性的变参数R-O模型,讨论了模型参数R,及参考剪应变的计算方法。推导了堆石料的增量耗散函数表达式,在热力学基本定律的框架下,研究了堆石料的屈服函数,讨论了其动力变形机理和第2阈值应变。对进一步认识筑坝堆石料动应力变形特性有一定意义。
By using statistical methods, the average curve expressions of dynamic shear modulus ratio and damping ratio of rockfill materials are given. A variable parameter R-O model is established to reflect the nonlinearity and hysteresis of the rockfill materials. The calculation method of the model parameter R and the reference shear strain are discussed. Based on the basic laws of thermodynamics, the yield function of rockfill materials is studied. The dynamic deformation mechanism and the second threshold strain are discussed. It is of some significance to further understand the dynamic stress-deformation characteristics of damped rockfill materials.