单元类型选择对土石坝应力变形计算结果的影响

摘要

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 provided by ABAQUS. The 8-node isoparametric element model and 20-node isoparametric element model are coded into a finite element program and used to analyze the stress-strain of an earth-rock dam. It is indicated that the stress and deformation results calculated by the 8-node isoparametric element model are close to those calculated by the 20-node isoparametric 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.%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-v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.