摘要
影响黄土湿陷特性的主要因素是其微观结构的变化。以西北某机场工程为例,利用扫描电子显微镜定性和定量研究了不同击实次数下黄土的微观结构变化特征。结果表明:随着击实次数的增加,击实黄土的孔隙逐渐减少,颗粒接触越来越密实,使击实黄土的强度越来越强,但在击实次数为98次之后,击实黄土在表观上差别不大;随着击实次数的增加,击实黄土的孔径逐渐变小,孔隙分布从大、中孔隙逐渐变为微小孔隙,其分布越来越均匀,但在击实次数为98次之后,击实黄土的孔隙随击实次数的变化已不明显,尤其是112次之后,颗粒接触基本上都是团粒集合体间的面-面接触,击实黄土的微观结构基本稳定。
The main factor affecting the collapsibility of loess is the change of its structure.Taking an airport project in Northwest China as an example,this paper studies the microstructure characteristics of loess under different compaction times qualitatively and quantitatively by SEM.The results indicate that with the increase of compaction times,the porosity of soil samples decreases gradually,and the particle contact becomes more and more dense,which will make the strength of compacted soil samples stronger and stronger,but after 98 times,the difference is not big.With the increase of compaction times,the pore size of compacted loess gradually becomes smaller,and the pore distribution gradually changes from large pore to small pore,and the distribution becomes more and more uniform.After 98 times,the change of pore with the compaction times is not obvious,and especially after 112 times,grain are basically granular aggregates with the surface to surface contact,and the microstructure of the compacted loess is stable.
作者
魏桦
宁立波
WEI Hua;NING Libo(Air Force Engineering Design Bureau,Beijing 100086,China;School of Environmental Studies,China University of Geosciences,Wuhan 430074,China)
出处
《安全与环境工程》
CAS
北大核心
2018年第2期174-179,共6页
Safety and Environmental Engineering
关键词
黄土
微观结构
击实次数
机场工程
loess
microstructure
compaction times
airport project
作者简介
魏桦(1967—),男,硕士,高级工程师,主要从事岩土工程勘查设计工作。E-mail:98436443@qq.com
