摘要
针对散粒体的静力液化特性,在散粒体颗粒运动微观力学分析的基础上,在临界状态土力学框架内建立了一个简单的静力液化弹塑性本构模型。模型屈服函数和和硬化规律根据Chang提出的砂土微观力学模型,通过积分粒间接触力为宏观的应力不变量而建立,考虑了与材料状态相关的剪胀性和初始密度对散粒体应力应变关系的影响,并采用非相关联的流动法则。模型参数简单且有较明确物理意义,可以通过室内三轴试验确定。模型的数值结果与Toyoura砂以及砂粉混合土的三轴不排水剪切试验的应力应变曲线和应力路径吻合较好。
Based on the static liquefaction of granular materials, an elastoplastic static liquefaction constitutive model was proposed in the framework of critical state soil mechanics. The yielding surface and hardening rules were obtained by integrating the contact force of the model proposed by Chang and a non- associate flow rule was adopted as well. The model has taken the state dependent dialatency law and the effect of initial density to the stress-strain relationship into consideration. The parameters of the model are simple and have certain physical meanings. The predicted results obtained by the model have a good agreement with the undrained triaxial test of Toyoura sand and sand-silt mixture.
出处
《土木建筑与环境工程》
CSCD
北大核心
2014年第3期11-17,共7页
Journal of Civil,Architectural & Environment Engineering
基金
国家自然科学基金(51178044)
新世纪优秀人才资助项目(NCET-11-0579)
中央高校基本科研业务费(FRF-TP-12-001B)
北京高校"青年英才计划"
关键词
散粒体
静力液化
本构模型
数值模拟
granular material
static liquefaction
constitutive model
numerical simulation
