黄土震陷的微结构损伤模型  

Microstructural damage model of seismic subsidence of loess

作　　者：裘国荣[1] 石玉成[1,2] 刘红玫[1,2] 王平[1,2] 钟秀梅[1,2] 

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000 [2]中国地震局地震预测研究所兰州科技创新基地,甘肃兰州730000

出　　处：《自然灾害学报》2011年第5期210-215,共6页Journal of Natural Disasters

基　　金：国家自然科学基金资助项目(50878200)

摘　　要：黄土是典型的结构性土,微结构控制其力学性能和强度要求。通过黄土震陷实验和微结构电镜扫描实验,应用统计细观损伤力学深入研究了考虑微结构要素的黄土震陷的内在破坏机理,得到了黄土震陷的结构损伤模型和本构关系。将计算结果与实验结果进行了比较,结果表明,应用统计细观损伤力学研究黄土震陷机理具有较高的合理性,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分布有很大关系。As a typical structural soil,loess＇ s mechanical properties and strength are controlled by its microstruc- ture. Based on seismic subsidence experiment and electron microscope scanning experiment of loess, the inherent failure mechanism of seismic subsidence of loess in consideration of microstructure elements was researched further by statistic microscopic damage mechanics. The structural damage model and constitutive relation of seismic subsid- ence of loess were obtained. The calculated results were compared with experimental results. The results indicate that it is reasonable to research the mechanism of seismic subsidence of loess by statistic microscopic damage me- chanics. It appears that there is great relation between seismic subsidence of loess and the dynamic stress state as well as pores distribution of the loess.

关 键 词：黄土 震陷 损伤模型 本构关系 

分 类 号：P315.9[天文地球—地震学]