黄土震陷时微观结构随动应力变化分析  

Analysis on Microstructural Variety in Seismic Subsidence of Loess with Dynamic Stress

作　　者：裘国荣[1] 石玉成[1,2] 刘红玫[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：《西北地震学报》2010年第1期42-46,共5页Northwestern Seismological Journal

基　　金：国家自然科学基金(50878200);中国地震局兰州地震研究所论著编号:LC2010018

摘　　要：通过黄土微观结构图像的处理可以很好地提取黄土微观结构要素。本文取通渭老地震区的黄土做震陷实验,应用土体微观结构定量分析系统对不同正弦荷载下震陷土样的微结构图片作定量化结构效应分析,探讨了其不同动应力荷载下的微观结构参数变化规律,并建立了各参数与动应力的对应关系。结果表明,黄土震陷由其微观结构及外部荷载共同决定,各微观要素在震陷过程中有不同变化,孔隙的有效直径、孔径分维、连通率和颗粒定向度的微结构参数变化与残余变形变化基本保持一致。Loess＇s microstructural parameters could be obtained well by dealing with the microstructural image.Based on the seismic subsidence experiment of loess samples taken from the Tongwei old earthquake area,we count the microstructural parameters,research the orderliness of microstructural parameters variety corresponding to different sine wave dynamic stress values and find the relation between the microstructural parameters and the dynamic stress using the soil microstructual quantitative analysis system.It appears that seismic subsidence of loess depends on its microstructure and external stress state.All microstructural parameters hold different variety in the seismic subsidence process of loess.Among them the variety of effective diameter of trellis pores,pore diameter dimension,connectivity and granule beamed degree is in conformity with the variety of residual deformation of loess.

关 键 词：黄土 震陷 微观结构 定量分析 

分 类 号：TU435[建筑科学—岩土工程]