两种残余变形模型计算结果对比分析

Comparative analysis of calculated results by using two residual deformation models

为研究修正的沈珠江残余变形模型和双曲线残余变形模型的异同及其在实际工程中适应性,在同一条件下开展了面板坝二维有限元计算,对残余应变和坝体永久变形进行分析。研究结果表明:1强震荷载作用下两个模型计算结果总体规律一致。2考虑平均主应力影响的双曲线模型能更好地反映坝顶及其附近的残余变形规律。3残余体应变在双曲线模型中对永久位移值的贡献要小于其在修正沈珠江模型中的贡献。残余体应变对面板坝永久变形的影响要小于残余剪应变。

A two - dimensional finite element analysis of CFRD is carried out to study the residual deformation and permanent deformation under the same condition by using modified Shenzhujiang residual deformation model and hyperbolic residual deform- ation model respectively to explore their differences and the applicability in practical calculations. The results show that ： （ I ） the general principles of the two models are identical under the strong earthquake load; （2） the residual deformation at the dam crest and the nearby region simulated by the hyperbolic model is more precise because the mean principle stress is taken into account; （3） the contribution of the residual volumetric strain to the permanent displacement in the hyperbolic model is relatively lower than that in Shenzhujiang Model; the influence of the residual volumetric strain on the permanent deformation is lower than that of the residual shear strain.