筑坝土石料的变参数Ramberg-Osgood模型及其适应性研究  

Ramberg-Osgood model with variable parameters of earth-rock materials for earth-rock dam and its adaptability

作　　者：迟世春[1] 陈崇茂[1] 贾宇峰[1] 

机构地区：[1]大连理工大学水利工程学院,辽宁大连116024

出　　处：《岩土力学》2013年第1期1-5,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.51179024;No.50979014);高等学校博士学科点专项科研基金资助项目(No.20090041110016)

摘　　要：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。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.

关 键 词：土石坝料 变参数Ramberg-Osgood模型 滞回圈 

分 类 号：O343[理学—固体力学]