单元类型选择对土石坝应力变形计算结果的影响  

Effects on FEM Analysis for Stress-strain of Earth-rock Dam with Different Isoparametric Elements

作　　者：陈文明[1] 朱俊高[1] 

机构地区：[1]河海大学 岩土力学与堤坝工程教育部重点实验室,江苏南京210098

出　　处：《水利与建筑工程学报》2013年第1期44-46,129,共4页Journal of Water Resources and Architectural Engineering

基　　金：国家杰出青年科学基金(50825901);高等学校博士学科点专项科研基金(20110094110002)

摘　　要：为准确对比分析土石坝有限元计算时不同单元类型的选择对土石坝应力变形计算结果的影响,利用UMAT子程序,在ABAQUS中开发了邓肯-张E-ν模型。对某心墙堆石坝分别采用8结点等参单元和20结点等参单元进行了有限元计算,并分析两种单元类型的计算结果。结果表明,采用8结点等参单元和20结点等参单元计算得到的坝体沉降和防渗墙应力差异较小。8结点等参单元可有效地用于类似工程的应力变形的有限元分析中。In order to accurately analyze the effects on the stress-strain of earth-rock dam under models with different types of isoparametric elements, the Duncan-Chang（ E - v ） Model is developed on the basis of subroutine UMAT provid- ed by ABAQUS. The 8-node isoparametric element model and 20-node isoparametric element model are coded into a fi- nite element program and used to analyze the stress-strain of an earth-rock dam. It is indicated that the stress and defor- mation results calculated by the 8-node isoparametric element model are close to those calculated by the 20-node isopara- metric element model. The 8-node isoparametric element model could be efficiently used for the FEM analysis of the stress and deformation of similar earth-rock dams.

关 键 词：土石坝 应力变形 等参单元 有限单元法 

分 类 号：TV641[水利工程—水利水电工程]