试论晋西北N_2红粘土的膨胀性及其影响  

Expansibility of N_2 Red Clay in Northwestrn of Shanxi Province And Its Influence

作　　者：徐建闽[1] 

机构地区：[1]水利部天津水利水电勘测设计研究院

出　　处：《山西水利科技》2000年第2期78-82,共5页Shanxi Hydrotechnics

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 clays 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.

关 键 词：膨胀性 蒙脱石 比表面积 红粘土 引水工程 

分 类 号：P642.139[天文地球—工程地质学] TV67[天文地球—地质矿产勘探]