结构性粘土的弹粘塑损伤模型  

Elasto-viscoplastic damage model for structural clays

作　　者：何开胜[1] 沈珠江[1] 

机构地区：[1]南京水利科学研究院,江苏南京210029

出　　处：《水利水运工程学报》2002年第4期7-13,共7页Hydro-Science and Engineering

基　　金：国家自然科学基金资助项目(19772019)

摘　　要：根据天然粘土的微观变形机理,将结构性土的变形分为弹性、结构损伤破坏和重塑土3个阶段,并建立了描述结构性粘土变形的弹粘塑损伤模型.用该模型对长江下游河漫滩深厚软土地基堆土预压试验进行的数值模拟计算结果表明,弹粘塑损伤模型能较好地反映结构性粘土的加荷变形、固结变形和蠕变变形,可用于结构性粘土的工程计算和流变预测.On the basis of the micro deformation mechanism of natural clays, the deformation of structural clays is divided into three such phases as elastic, structural strength damage and remolded soil, and an elastoviscoplastic damage model is developed. Numerical simulation of the preloading test of a deep and thick soft ground at the alluvial flat of Yangtse River is carried out by use of the mode. Calculation results show that the elastoviscoplastic damage model can simulate the loading and consolidation deformation and creep of structural clays, and that the model can be used to calculate practical settlement and to predicate the creep deformation of structural clays.

关 键 词：结构性粘土 本构模型 损伤 粘塑性 大变形 

分 类 号：TU442[建筑科学—岩土工程]