亚塑性模型晶粒间应变参数研究  

Research on Intergranular Strain Parameters in Hypoplasticity Model

作　　者：刘广波[1] 周星德[2] 姜冬菊[1] 竺启泽 石星星[1] 刘谦敏[1] 

机构地区：[1]河海大学力学与材料学院,江苏南京210098 [2]河海大学土木与交通学院,江苏南京210098 [3]江苏华东工程设计有限公司,江苏南京210007

出　　处：《红水河》2011年第6期60-64,共5页Hongshui River

基　　金：国家十一五科技支持计划支撑项目(2008BAB29B03);国家自然科学基金(51178160);中央高校基金(2009B15814)

摘　　要：亚塑性模型是近年来提出的一种新的岩土本构模型,该模型不含屈服准则和破坏准则等概念,仅用一个张量方程来描述土体的耗散特性、塑性流动及剪胀特性等。亚塑性模型存在一个缺点在小应变时,应力与应变之间出现锯齿现象。为了消除此现象,Niemunis与Herle提出了晶粒间应变概念,从仿真结果可以看出,与晶粒间应变相关的参数对计算结果有一定的影响,为了尽可能减小这一影响,文章以Masin模型为研究对象,通过分析与晶粒间应变相关参数对计算结果的影响规律,提出最优参数的确定方法。In recent years, a new geotechnical constitutive modelhypoplasticity model, which doesn＇t contain yield and failure criterion, is proposed, and only a tensor equation is utilized to describe the dissipation, plastic flow and dilatancy characteristics of the soil. Otherwise, ratcheting is existed for small strain range, in order to eliminate ratcheting, Niemunis and Herle proposed the concept of intergranular strain, and the simulation results revealed that the intergranular strain parameters have a little affect on the calculation results. In order to abbreviate the affect as much as possible, the Masin＇s model is adopt- ed as the research object in the paper, all parameters concerned intergranular strain are analyzed and simulated, and a group of optimal parameters are suggested.

关 键 词：亚塑性 参数调整 粘土 晶粒间应变 

分 类 号：TU352[建筑科学—结构工程]