【摘要】 黄土是典型的结构性土,其震陷性主要由内部结构和外部荷载共同作用所致。黄土震陷是内部微结构要素在外部荷载作用下不同时空中重组后的集合宏观表现。通过微结构电镜扫描实验获取黄土颗粒和孔隙的分布,应用统计细观损伤力学和结构力学的理论建立黄土震陷的结构损伤模型,解释了黄土震陷的内在破坏机理,并建立了完整的震陷本构关系。表明黄土震陷主要是由其独特的架空孔隙结构破坏和土体颗粒掉入孔隙所致,与其动应力状态和孔隙颗粒分布状态有很大关系。更多还原

【Abstract】 Loess is a typical structural soil,and its seismic subsidence is mainly due to the internal microstructure and external load.Seismic subsidence of loess is a congregated macroscopical phenomenon of microstructure with the external load in different time and space.The distribution of loess particles and pores is obtained through electron microscope scanning experiments.The structural damage model is established by means of the statistical microscopic damage mechanics and structural mechanics.It explains the inherent damage mechanism of seismic subsidence,and the complete constitutive relation is obtained.The results indicate that the seismic subsidence of loess results from the damage of particular trellis pores and particles falling into trellis pores.It appears that there’s a great relation between the seismic subsidence of loess and the dynamic stress and the distribution of particles and pores.更多还原