摘要
本文在分析晋西北地区N2 红粘土膨胀特性及其机理的基础上 ,结合万家寨引黄工程实践 ,研究和讨论了N2红粘土对工程建筑尤其是地下工程建筑产生的影响。
In this paper,the distribution pattern and physical properties such as natural water content in soil,density and consistency of N 2 red clay in Northwestern of Shanxi Province are introduced,the N 2 red clays expansibility and its mechanism are analysed.The results show that 1]the free expansion rate of N 2 red clay is 40%-55%,the expansion force is 0.18-0.30 Mpa;Under the load of 0.05Mpa,the expansion rate is only 0.35%-0.55%;After air seasoning,the expansion force can be increased 3-4 times.2]the clay grain content in N 2 red clay is generally 30%-45%,the effective montmorillonite content in N 2 red clay is 10%-18%.As the above properties of expansion of N 2 red clay,it will properly cause instability of side slope,landslip and deformation of surrounding rock of tunnel in the YRDP,therefore the effective measures should be taken as far as possible to reduce or avoid the variation of water content in N 2 red clay,thus to decrease even to eliminate the influence of the expansibility of soil on the project.
出处
《山西水利科技》
2000年第2期78-82,共5页
Shanxi Hydrotechnics
关键词
膨胀性
蒙脱石
比表面积
红粘土
引水工程
Expansibility Groundwater Montmorillonite Specific Surface Area
