甘肃永登湿陷性新近堆积黄土的微观结构分析  

Analysis on Microstructure of the Recently Cumulated Collapsible Loess in Yongdeng County,Gansu Province

作　　者：邓津[1] 王兰民[1] 张振中[1] 袁中夏[1] 

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000

出　　处：《西北地震学报》2005年第3期267-271,共5页Northwestern Seismological Journal

基　　金：国家自然基金项目资助(50379049);中国地震局兰州地震研究所论著编号:LC20050050

摘　　要：甘肃永登县树屏村某工程场地土为第四纪新近堆积黄土,其工程性质较为特殊,具有较大的湿陷性,但在天然湿度下震陷性却很小。本文利用扫描显微镜对其微结构图象进行分析,同时结合土工试验结果,揭示了导致其特殊工程性质的微观机理。最后提出了在工程施工中应注意的问题。It is found that the recently accumulated loess in one site at Shuping village , Yongdeng country, Gansu province, has special engineering behaviors. It has larger water collapsibility but only smaller seismic subsidence in natural humidity. Based on the analysis of microstructure images by means of scanning electron microscopy and experimental results of its physical parameters, the micro-mechanism of causing the special engineering behaviors is revealed. Some suggestions for construction on this kind site soil are presented.

关 键 词：新近堆积黄土 微结构 震陷 湿陷 

分 类 号：P315.9[天文地球—地震学] P642.1[天文地球—固体地球物理学]