基于ADINA的软土粘弹塑性模型二次开发研究  

Secondary Development of Viscoelastic-plastic Model of Soft Clay Based on ADINA

作　　者：付贵海[1,2] 魏丽敏[1] 周慧[3] 邓宗伟[2] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]湖南城市学院土木工程学院,湖南益阳413000 [3]湖南城市学院城市管理学院,湖南益阳413000

出　　处：《公路交通科技》2013年第12期29-34,44,共7页Journal of Highway and Transportation Research and Development

基　　金：铁道部科技研究开发计划重点课题项目(2009G008-B);铁道部科技研究开发计划项目(2010G018-E-3);湖南省教育厅重点项目(09A016);湖南省教育厅青年项目(13B010)

摘　　要：由于软土具有蠕变特性,而商业化软件提供的岩土本构模型往往不能满足软土地区实际工程数值分析的需求。将一维广义西原模型的应力-应变关系推广为三维应力状态的弹-粘弹-粘塑本构方程,采用D-P屈服准则推导出用于数值计算的粘弹性柔度矩阵和粘塑性柔度矩阵,并成功添加到ADINA有限元程序中。然后利用曲线拟合法确定流变模型参数,并利用二次开发的粘弹塑模型,对软土的三轴蠕变进行数值模拟,通过数值模拟和三轴蠕变试验的结果比较,验证了模型的正确性和可靠性。文中二次开发采用的方法具有普遍性,可以为其他粘弹塑模型的开发提供借鉴和参考。Because of the creep property of soft clay, the constitutive models supplied by existing commercial software cannot usually satisfy the requirement of numerical analysis of actual engineering in soft clay region. The stress-strain relation of 1D generalized Nishihara model is developed to 3D stress state elastic-viscoelastic- viscoplastic constitutive equation. Adopting Drucker-Prager （DP） yield criterion, a viscoelastic flexibility matrix and a viscoplastic flexibility matrix for numerical calculation are derived, and added to ADINA finite element program. Then, rheologieal parameters are determined by using the curve fitting method, and the numerical simulation of triaxial creep test on soft soil is carried out by using secondary developed viscoelastic- plastic model. The feasibility and accuracy of the model are verified by comparing the result of numerical simulation with that given by triaxial test. The proposed method of secondary development is universal and can offer a reference for other viscoelastic-plastic models＇ secondary development.

关 键 词：道路工程 粘弹塑模型 柔度矩阵 软土 二次开发 

分 类 号：U416.211[交通运输工程—道路与铁道工程]