基于Weibull分布的土-结构接触面统计损伤软化本构模型  

Statistical Damage Softening Constitutive Model of Soil-Structure Interface Based on Weibull Random Distribution

作　　者：夏红春[1] 周国庆[1] 商翔宇[1] 

机构地区：[1]中国矿业大学建筑工程学院

出　　处：《中国矿业大学学报》2007年第6期734-737,747,共5页Journal of China University of Mining & Technology

基　　金：国家重点基础研究发展规划(973)项目(2002CB412704);国家自然科学基金重点项目(50534040)

摘　　要：以法向应力为0.8-1.0 MPa条件下的土-结构接触面剪切力学特性及变形性态为依据,从土-结构接触面抗剪强度的随机性出发,将接触面上的整体剪切破坏视为有限个微元的剪切破坏的组合,提出了基于平面应变条件下Mohr-Coulomb屈服准则的土-结构接触面微元强度表达式,在假定微元强度或微元破坏服从双参数Weibull分布的基础上,建立了土-结构接触面统计损伤软化本构模型.结果表明,模型能够较好地反映土-结构接触面变形破坏的全过程,尤其是剪切过程中所表现出的应变软化特性,其模拟与试验结果曲线的相关系数达0.99以上.The shear failure of the whole soil-structure interface is regarded as the combination of the failure of finite micro cells based on the randomicity of the shear strength and the shear deformation characteristics under 0.8- 1.0 MPa normal stress condition. The shear strength expression of the micro tiny cells on the soil-structure interface was proposed in terms of the Mohr-Coulomb criterion under plane strain condition. The statistical damage softening constitutive model of the soil-structure interface was established based on the double-parameter Weibull random distribution for the shear failure of finite micro cells. The results show that the model can simulate the whole failure process of the soil-structure interface, especially in those case that the characteristics of strain softening is prominent during the shearing process. The correlation coefficient of the model and experimental curves is more than 0.99.

关 键 词：标准中砂 接触面 WEIBULL分布 应变软化 本构模型 

分 类 号：TU441.5[建筑科学—岩土工程]