CAJ | 학술논문

结构对土体的变形特性有强烈影响,土体本构模型应该反映土体的结构性.通过调研分析将土体变形表现出的超固结划分为结构超固结与应力超固结这2种不同性质的超固结,从而使结构超固结与应力超固结统一起来.土体结构超固结采用结构超固结参数来表示.模型对修正剑桥模型进行扩展,模型的屈服面形状与修正剑桥模型一致,而屈服面的大小由结构超固结和应力超固结P_s之和决定,而屈服面的变化由体积硬化与结构损伤共同来描述,模型采用相关联流动法则;从而提出了一个可考虑结构性的粘土本构模型.模型概念明确,参数简单并有物理意义.初步验证表明,模型可以较好的反映结构性土体的变形特性.
결구대토체적변형특성유강렬영향,토체본구모형응해반영토체적결구성.통과조연분석장토체변형표현출적초고결화분위결구초고결여응력초고결저2충불동성질적초고결,종이사결구초고결여응력초고결통일기래.토체결구초고결채용결구초고결삼수래표시.모형대수정검교모형진행확전,모형적굴복면형상여수정검교모형일치,이굴복면적대소유결구초고결화응력초고결P_s지화결정,이굴복면적변화유체적경화여결구손상공동래묘술,모형채용상관련류동법칙;종이제출료일개가고필결구성적점토본구모형.모형개념명학,삼수간단병유물리의의.초보험증표명,모형가이교호적반영결구성토체적변형특성.
Structure has a major influence on the stress-strain relation of soil, which implies that the constitutive model should reflect the its structure. Based on the investigation , the over-consolidation (OC) of the soils was made up of two different types, which were structure-induced OC and stress-induced OC. And then the structure-induced OC and stress-induced OC were united. Structure-induced OC index was used to represent the degree of structure and the cam clay model was extended. The shape of the yield surface was the same as cam clay model, whise the size was equal to the sum of the structure-induced OC and stress-induced OC. And the change in size of the yield surface was decerminated by the volume-harden function and the structural damage function. The associated flow rule was adopted in the model.Afterwards constitutive model for structured clays was presented.