【摘要】 介绍一个用于流动液化变形分析的临界状态砂土模型.该模型的参量与应力和材料状态无关,模型能自动处理材料因过程发展而产生的各种状态变化.对于一种或几种类似的土,参量一经率定,不论材料初始处在松的可液化状态还是紧的剪胀状态,模型以统一方式模拟材料从起始阶段近似弹性的响应直到趋于临界状态破坏,包括流动液化在内的全程响应,无需在分析过程中人为干预调整模型参量.作者利用完全耦合有限元分析程序SUMDES2D,以Upper San Fernando土坝在1971年地震中的分析为例,示范该模型在流动液化变形分析中的应用.更多还原

【Abstract】 A framework for unified modeling of sand behavior is described. In this modeling framework, model con-stants are considered as intrinsic soil properties, independent on stress state and material state. A single set of model constants, once calibrated, automatically takes care of a wide range of ’ on-process’ state variation. As a result, for a given soil or similar soils, either in a very loose liquefiable state or in a dense dilative state, the responses from essentially elastic response at the beginning up to critical state failure, including flow liquefaction response, are modeled in a unified manner, without intervention from users through adjusting model constants. The case history of the upper San Fernando dam during the 1971 earthquake is used as an example of numerical analysis using such a model and the fully coupled analysis procedure SUMDES2D.更多还原