基于剑桥模型的砂土剪胀模型  

Dilatant Model of Sand Based on the Cam-Clay Model

作　　者：迟明杰[1] 赵成刚[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《北京交通大学学报》2008年第1期49-53,共5页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：北京市自然科学基金资助项目(8052015)

摘　　要：对于中密砂和密砂,剪胀现象是一个比较显著的特征,相变线是描述剪胀现象的一条特征线,相变线比较容易确定.本文在已有弹塑性模型基础上,对硬化参数进行修正,并引入与相变线相关的状态参量,建立了一个新的剪胀性砂土本构模型.该模型尤其适合于中密砂和密砂,对于松砂则退化为原弹塑性模型.模型包含9个材料参数,参数比较容易确定.数值模拟结果能较好的描述砂土的主要特性.Dilatant phenomenon is one of the key features of medium-dense sand and dense sand, and phase transition line can be used to describe this phenomenon. Based on the Cam-Clay model, an elastic-plastic model is proposed. To character the dilatant behavior of sand correctly, a function modifying the hardening parameter is introduced, and a state parameter involving the void ratio of phase transition is suggested. The model includes 9 parameters, which can be easily determined. The principal behaviors of medium dense sand and dense sand have been precisely represented.

关 键 词：岩土工程 砂土 本构模型 硬化参数 相变线 状态参量 

分 类 号：TU411.3[建筑科学—岩土工程]