CAJ | 학술논문

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.
피엄범채용적등개선성점탄성모형불심구토체동응력-응변적구체표체식,무법급출능량모산함수,위심입연구축패토석료동력변형궤제대래불편.변삼수 Ramberg-Osgood 모형(간칭 R-O 모형)통과변동량개삼수이괄응토체동모량쇠감화조니증장,병급출체회권적수학표체식.연구중토론료변삼수 R-O 모형적괄응범위,발현해모형불괄합묘술토체적소응변동력특성,급출료축패토석료변삼수표체식,회제료여시험곡선상협조적응력응변체회권.가이간출변삼수 R-O 모형능구교호지묘술축패토석료적동력특성,위진일보연구축패토석료적동력모산여변형궤제전정료기출.
It is inconvenient for research the deformation mechanism of materials for earth-rock dam under dynamic loading using equivalent linear viscoelastic model, though it has been applied widely, because the stress-strain expressions haven’t been derived in this model and the energy dissipation don’t be described. In this paper, the Ramberg-Osgood constitutive model with variable parameters has been researched; and its adaptability has been discussed. It is found that the Ramberg-Osgood constitutive model is not applicable for describing the dynamic property of soil in small strain level. Also the expression of variable parameters is derived;the hysteretic loops have been drawn in different dynamic shear levels. A solid foundation has been established for studying the dynamic dissipation and strain mechanism of earth-rock dam materials.