摘要
采用三维非线性有限元方法分析深覆盖层上面板堆石坝防渗墙应力变形特性。采用邓肯-张E-B模型模拟覆盖层和坝体材料的本构关系,采用接触摩擦单元模拟防渗墙和覆盖层之间的相互作用。考虑覆盖层地基的多孔介质属性,进行覆盖层地基渗流作用的防渗墙应力变形计算。分析了防渗墙施工顺序对墙体应力变形特性的影响,以及悬挂式防渗墙的应力变形特性。计算结果表明防渗墙靠后的施工顺序可以改善墙体的应力变形性状,悬挂式防渗墙贯入深度越小,其应力变形特性越趋于安全稳定。
The 3D non-linear finite element method is applied to analyze the characteristics of the stress deformation of the cutoff wall of the CFRD on the deep overburden.The constitutive relationship between the overburden and the dam materials is simulated by application of Duncan-Chang E-B model;the interaction between the cutoff wall and the overburden, by the contact friction unit.In consideration of the property of porous media of the overburden foundation, calculation on the stress deformation of the cutoff wall is executed based on the seepage function of the overburden foundation.Impacts on characteristics of the stress deformation of the cutoff wall by the sequence of the cutoff wall construction as well as characteristics of the stress deformation of the suspended cutoff wall are analyzed respectively .The calculation results show that the late sequence of the cutoff wall construction may improve the property of the stress deformation of the cutoff wall.The smaller the penetration depth of the suspended cutoff wall is, the safer and stabler the catachrestic of the stress deformation is.
出处
《西北水电》
2014年第2期20-24,共5页
Northwest Hydropower
